Laser Beam Profiler

Laser Beam Profiler

Keywords: Laser Beam Meaurement, beam prfiler, beam quality, M2,beamwav
Jun 07, 2021 View: 3462 Data Sheet

The passive cooled sensor of the STCam is constructed without cover glass to avoid interference patterns. For sensor protection a low distortion neutral density filter is integrated.

Measurement of Laser Beam Profile and Propagation Characteristics

1. Laser Beam Measurement Capabilities

Laser beam profiling plays an important role in such applications as laser welding, laser focusing, and laser free-space communications. In these applications, laser profiling enables to capture the data needed to evaluate the change in the beam width and determine the details of the instantaneous beam shape, allowing manufacturers to evaluate the position of hot spots in the center of the beam and the changes in the beam’s shape.

Digital wavefront cameras (DWC) with software can be used for measuring laser beam propagation parameters and wavefronts in pulsed and continuous modes, for lasers operating at visible to far-infrared wavelengths:

  • beam propagation ratio M²;

  • width of the laser beam at waist w0;

  • laser beam divergence angle θx, θy;

  • waist location z-z0;

  • Rayleigh range zRx, zRy;

  • Ellipticity;

  • PSF;

  • Wavefront;

  • Zernike aberration modes.

These parameters allow:

- controlling power density of your laser;

- controlling beam size, shape, uniformity, focus point and divergence;

- aligning delivery optics;

- aligning laser devices to lenses;

- tuning laser amplifiers.

Accurate knowledge of these parameters can strongly affect the laser performance for your application, as they highlight problems in laser beams and what corrections need to be taken to get it right.

Figure 1. Characteristics of a laser beam as it passes through a focusing lens.

2. Beam Propagation Parameters

M², or Beam Propagation Ratio, is a value that indicates how close a laser beam is to being a single mode TEM00 beam. This in turn relates to how small a spot a laser can be focused. For a laser beam propagating through space, the equation for the divergence, Θ, of a pure Gaussian TEM00 unfocused beam is given by:

Θ00 = 4λ/πD00                                                            (1)

where D00 is the waist diameter of the beam, and λ is the wavelength. Actual beams with additional modes often start with a larger beam waist, D0, and/or have a faster divergence Θ0. In this case Equation (1) becomes:

Θ0 = M2 4λ/πD0                                                         (2)

where Θ0 and D0 are the divergence and width of a higher mode beam and M² is greater than 1 and is named the “Beam Propagation Ratio” per the ISO 11146 standard. When a pure Gaussian laser beam is focused, the diameter of the focused spot is defined by:

d00 = 4λf /πD00                                                            (3)

where D00 is the ideal focused spot diameter,  f is the focal length of the lens, and is placed one focal length from the lens as shown in the Figure 1. However, when a distorted or multimode beam is focused, Equation (3) becomes:

d0 = M2 4λf  / πD0                                                       (4)

Apart from M², the measured beam propagation parameters characterizing laser beams are:

w0 = d0/2– the waist radius in X (horizontal) and Y (vertical) directions;

z-z0 – the distance between measurement and waist planes;

zR – the Rayleigh range, for which the radius of curvature R of the wavefront is minimal;

θ – the divergence angle of the measured laser beam far from the waist;

R – the radius of curvature of the wavefront in the measurement plane.

 

3. Measurement of Propagation Parameters with DWC

3.1 Principle

Propagation parameters are measured by DWC on real beams by focusing the beam with a fixed position lens of known focal length, and then measuring the characteristics of the artificially created beam waist and divergence.

Measurement of the beam propagation parameters with DWC is based on the simultaneous measurement of the high-resolution images of intensity and wavefront. The wavefront is computed starting from two slightly defocused beam intensity images acquired on one CCD camera inside DWC by mathematical computations involving the two images and the difference between them (Figure 2). From the wavefront, the beam propagation parameters are obtained by straightforward but tedious computations.

Figure 2. Principle of DWC: Acquisition of two images in real time at two different focal planes, wavefront extraction and computation of beam propagation parameters.

Figure 3. DWC and the Graphic User Interface of its associated software.

3.2 System Set-up

Figure 4. Example of a setup for measurement of laser propagation parameters with DWC.

 

STC Series Laser Beam Profilers

VIS/NIR Beam Profiler: STCam CCD

 

Our CCD is developed to provide excellent sensitivity from the VIS to NIR spectral range. Thanks to its high resolution and its small pixel size, the STCam is a high performance tool for laser beam analysis of continuous wave (CW) and pulsed laser modes. Due to its high dynamic range the STCam captures even higher laser modes with outstanding detail.

The passive cooled sensor of the STCam is constructed without cover glass to avoid interference patterns. For sensor protection a low distortion neutral density filter is integrated. The STCam supports the ultra-fast FireWire IEEE 1394b interface with data transfer rates up to 800 Mbit/s. The plug and play design facilitates easy and flexible integration and operation.

The portable STCam is designed to be used in a variety of applications in industry, science, research and development, including:

  • Laser beam analysis of CW and pulsed lasers,

  • Quick control of laser modes and adjustment errors,

  • Test equipment for scientific research,

  • Near-Field and Far-Field analyses of lasers, LED devices and other light sources.

The enhancement of product quality, process reliability and efficiency are just a few of the many benefits of our unique beam profiler cameras. The STCam includes the specifically designed analysis software, STRayCi, which supports Windows XP/Vista operating systems. Its sophisticated software architecture opens up new opportunities in laser beam analysis according to ISO standards.

The concept of the STCam enables easy adaption to standard optical imaging systems, attenuators and opto-mechanical components ensuring highest flexibility. This includes:

  • Microscope lens and beam expander,

  • UV-Converter and IR-Converter,

  • Fixed and variable attenuators, etc.

ACCESSORIES

Neutral Density Filter: To expand the power range of the STCam several absorptive and metallic-coated neutral density filters are available, which are specified by optical densities ranging from OD 1.0 to OD 4.0.

FireWire Component: We offer different FireWire PCI / PCI Express cards for installation direct into the PC. Standard FireWire cables are suitable for industrial applications and are available in various lengths. 

Trigger Device: To synchronize the STCam with pulsed laser systems, our trigger device is perfectly suited. This frequency and delay generator is software controllable and enables the synchronization of up to four beam profilers with different delay times simultaneously.


CCD-1201

CCD-2301

CCD-2302

SENSOR DATA

Format

1/2”

2/3”

2/3”

Active area

6.5x4.8mm

9.0x6.7mm

8.5x7.1mm

Number of pixel

1388x1038 (1.4MPixel)

1388x1038 (1.4MPixel)

2452x2056 (5MPixel)

Pixel size

4.65x4.65μm

6.45x6.45μm

3.45x3.45μm

Spectral response   without cover glass

350-1100nm

350-1100nm

350-1100nm

Laser beam diameter min/max

46.5/4mm

64.5μm/5mm

34.5μm/5.5mm

Sensor cooling

passive

passive

passive

CAMERA FEATURES

Lens Mount

C-Mount

C-Mount

C-Mount

Bit depth (output)

14Bit

14Bit

14Bit

Dynamic (signal to   noise)

60dB (1:1000)

67dB (1:2200)

54dB (1:500)

Frame   rate

up to 15Hz

up to 16Hz

up to 9Hz

Exposure time

100μs-1s

100μs-1s

100μs-1s

Interface

FireWire (IEEE1394b)

FireWire (IEEE1394b)

FireWire (IEEE1394b)

I / O connector

12-Pin Hirose

12-Pin Hirose

12-Pin Hirose

Mode

CW or pulsed

CW or pulsed

CW or pulsed

Trigger

TTL-signal

TTL-signal

TTL-signal

Combinable with

IR-/UV-Converter Beam   expander Attenuator

Beam expander   Attenuator

Beam expander   Attenuator

SPECIFICATIONS

Mechanical dimensions   (WxHxL)

60x60x103.8mm

60x60x103.8mm

60x60x103.8mm

Weight

300g

300g

300g

Electrical   requirements

DC 8V-36V

DC 8V-36V

DC 8V-36V

Storage temperature*

-10°C…+60°C

-10°C…+60°C

-10°C…+60°C

Operating   temperature*

+5°C…+45°C

+5°C…+45°C

+5°C…+45°C

Regulations

CE, RoHS

CE, RoHS

CE, RoHS

* without condensation

Neutral Density Filter

Our neutral density filters allow broadband attenuation for a spectral range from VIS to NIR. Due to their excellent surface quality the absorptive and reflective filters enable precise beam attenuation for low power applications. The level of attenuation is specified by the optical density. Filters with different optical densities can be combined. A filter adapter is available to mount the filters on the STCam aperture.

Reflective ND filter

Absorptive ND filter

NDR-10 / NDR-20 / NDR-30 / NDR-40

NDA-10 / NDA-20 / NDA-30 / NDA-40

Optical density*

1.0 / 2.0 / 3.0 / 4.0

1.0 / 2.0 / 3.0 / 4.0

Spectral range

200nm - 1200nm

400nm - 700nm / 700nm   - 1200nm

Material

UV-Fused silica   (Coating: Metal)

Schott glass

Flatness

1λ @ 300nm

λ/10 @ 632.8nm

Scratch-Dig

40 - 20

40 - 20

Parallelism:

3arcmin

10arcsec

Optical density   tolerance

±5%

±5%

Power (Pmax)

< 1W

< 1W

Intensity (Imax)

0.75W/cm2

1W/cm2

Diameter

∅=25mm/25.4mm

∅=25mm/25.4mm

Operating temperature

< 100°C

< 100°C

Filter threads

Filter thread / Filter   mount

Filter thread /   Filter mount

Filter adapter

C-Mount thread /   Filter thread

C-Mount thread /   Filter thread

Laser Beam Profiling Software STRayCi

 

Our sophisticated beam profilers are available with the specifically designed analysis software, STRayCi, which supports Windows XP/Vista operating systems. It is available as 32 Bit / 64 Bit version and can control up to eight beam profiler cameras on a single computer.

Due to its clearly designed menu structure, STRayCi shows self-explanatory functions, which help the user to access quickly standard settings. Incomparable visualization modes, extensive analytical capabilities as well as new developed correction algorithms ensure the highest accuracy in laser beam analysis.

A wide range of beam width techniques e.g. 2nd Moment, Knife Edge, Moving Slit, Plateau, Gauss-Fit can be applied to determine quick and reliable standard beam parameters. The unique measurement tool enables the continuous monitoring of beam parameters, beam position and power density distribution. Helpful features like AOI Tracking, AOI Optimization, Zoom Functions, Look-Up Tables, etc. simplify the laser beam analysis.

The extraordinary graphical and analytical tool of STRayCi can be used for live data (LiveMode) and stored data (SaveMode) simultaneously, while each mode has its own individual functions. This makes STRayCi the most advanced analysis software on the market.

STRayCi is equipped with flexible data and image output capabilities. This permits the user to store data and images in the format that is compatible with their needs.

A clearly arranged and printable protocol view displays the chosen measurement parameters as well as the most important laser beam analysis results.

STRayCi is compatible with guidelines of the international standard organization for laser beam measurements:

  • ISO 11145: Vocabularies and symbols

  • ISO 11146: Beam width, propagation ratio,…

  • ISO 11670: Beam positional stability,…

  • ISO 13694: Beam power density distribution,… 

STRayCi works only with a USB software protection lock. It is a hardware based security solutions to protect and encrypt the software against piracy.

MINIMUM SYSTEM REQUIREMENTS:

  • Windows XP / Vista

  • Pentium IV / AMD Processor

  • 128 MB graphic card, Open GL V1.4 compatible

  • 100 MB free memory

  • PCI / PCIe slot for FireWire card

  • USB port for dongle connection

  • CD / DVD-ROM drive for software installation

  • Internet access for update request

STRayCi Special Features

REAL-TIME BEAM PROFILING

2D / 3D intensity plots / Cross sections / Histogram

Pointing stability (x-y fluctuation, COG- position analysis, ect.)

Parameter stability (intensity, power, center x-y, beam size)

Parameter results (beam statistics, beam width, beam parameter)

 

CAMERA CONTROL

Multiple camera support

Different measure types

User-selectable exposure time and gain factor, auto-exposure time

Floating average and variable brightness

ANALYSIS FUNCTIONS

Beam statistics (power, max intensity, COG, etc.)

Beam width (2nd Moment, Gauss / Super-Gauss-Fits, Plateau, Knife Edge, Moving Slit, ect.)

Beam parameter (beam width, ellipticity, uniformity, etc.)

CALIBRATION AND CORRECTION TOOL

Background subtraction, auto-background

Pixel correction technology (offset correction, linearity, etc.)

Power calibration

OTHER FEATURES

User-defined Area of Interest (AOI)

AOI tracking and optimization

Color palettes incl. auto-contrast function

Zoom functions

2D profile arithmetic operations, filters, transformations, etc.

E-mail support

FLEXIBLE OUTPUT

Data: txt, tiff

Image: jpeg, png, bmp, gif, tiff

Protocol: pdf

STC-DD Laser Beam Profiler

Measurement of Beam Diameter, Divergence & Energy Distribution

 

Laser profile analyzer is adopted to measure laser transverse mode energy distribution. One-dimensional, two-dimensional and three dimensional energy distribution will be shown on the software, as well as laser transverse mode characteristics of spot diameter, beam divergence, ellipticity and etc.

The software can provide four calculation method of measured results of laser spot diameter, one of the most widely used definition method is 13.5% of peak value as the boundary (1/e2), and the beam ellipticity definition is the ratio of 4 Sigma spot diameter on minimum direction and 4 Sigma spot diameter on maximum direction.

Laser beam divergence is a physical parameter to describe laser divergence degree, the measurement method is roughly summed up as measuring beam spot diameters both on near field and far field, by calculating the distance between the two spot diameter deviation of the two positions of tangent value, which can determine the divergence angle value, then converted into spacial angle value.

Technical Specifications:

Part   number

STC-DD

Wavelength   range

350-1320nm

Maximum   sensor diameter

9mm

Measurement   accuracy

±2%

Display of Measurements

 

M² Factor Measurement System / M² Meter

 

 

Laser beam quality and its focusing capability are very important parameters of a laser and are usually characterized by M² factor. To measure the M² factor for a laser, it is calculated based on the difference between the product of the beam diameter and divergence, and the ideal Gaussian beam diffraction limit. The laser beam quality M2 is as below:

image.png

Where M2 is the laser beam quality M2, π is 3.1415927, λ is laser wavelength, d0 is beam diameter, and θis divergence angle.

Part number

STC-M2

Detector material

Si

Wavelength range

400-1100nm

Receiving beam diameter

20um-9mm

Testing output power range

10nW-10W(Depends on   the beam diameter)

The system comes with software. After the positions are keyed in the software, the beam diameters and M2 will be calculated and given as shown as follows:

 

SDR Series Beam Profilers

1. SDR-WCD-LCM: 1” CMOS Beam Profiling Camera, USB3.0

With an 11.3 x 11.3 mm active area, 4.2 Mpixels, 5.5 x 5.5 µm pixels, optical and electronic triggering of a global shutter, and an update rate to 60+ Hz, the SDR-WCD-LCM series is ideally suited to both CW and pulsed laser beam profiling.  The high resolution CMOS detector means no comet tailing, and the shutter and trigger options simplify pulse capture. 

The SDR-WCD-LCM is paired with a full-featured software which has no license fees, unlimited installations, and free software updates.  It is ideal for applications including: CW and pulse laser profiling; field servicing of laser systems; optical assembly; instrument alignment; beam wander and logging; R&D; OEM integration; quality control; and M2 measurement with available M2DU stages.

 

System Features:

  • 355 – 1150 nm (CMOS)

    -TEL sensor options for 1480-1610 nm

    -UV and 1310 nm options available

  • 4.2 MPixel, 2048 x 2048 pixels, 11.3 x 11.3 mm active area

  • 5.5 µm pixels

  • 60 fps @ 512 x 512, 30 fps @ 1024 x 1024, 12 fps @ 2048 x 2048

  • Port-powered USB 3.0

  • HyperCalTM – Dynamic Noise and Baseline Correction software.

  • MagNDTM stackable magnetic ND filters or C-mount filters

  • 2500:1 signal to RMS Noise

  • Global shutter with TTL trigger

  • Electronic auto-shutter, 85 µs to 2 sec (44dB)

  • 12-bit ADC

  • Isolated pulse triggering

  • Parallel capture on multiple cameras

  • Field-replaceable image sensors

  • Relative power level display

  • Window-free sensor standard for no fringing

  • ISO 11146 M2 option – beam propagation analysis, divergence, focus

  • Available in specialized beam profiler systems

    -Industrial Laser Monitoring System (ILMS)

    -Large Beam Profiling system (LBPS)

    -Line Laser Profiling System (LLPS)

Applications:

  • CW & pulsed laser profiling

  • Field servicing of lasers and laser-based systems

  • Optical assembly & instrument alignment

  • Beam wander & logging

  • M2 measurements

Additional software features:

  • XY profiles and centroids

  • Linear and logarithmic displays

  • Gaussian and Top Hat least squares fits

  • Ellipse Angle, Major, Minor, Mean Diameters

  • ISO 11146 compliant

  • Background capture and subtraction

  • Image & Intensity Zoom

  • Linear and area filters

  • Image Averaging, 1 to continuous

  •  Proprietary HyperCalTM Dynamic Noise and Baseline Correction

Model Specifications:

Specification

Detail

Notes

wavelength range:

SDR-WCD-LCM-UV:190–1150 nm

Incl. MagND-UV filters: ND 1, 2, 4 and   MagND filters: ND 1, 2, 4

SDR-WCD-LCM: 355-1150 nm

Incl. MagND filters: ND 1, 2, 4

SDR-WCD-LCM-1310:355-1350nm

Incl. MagND filters: ND, 1, 2, 4, 1290 nm   longpass filter

SDR-WCD-LCM-TEL:1480-1610nm

Incl. MagND filters: ND 1, 2, 4, 1290nm   longpass filter

Image area (mm)

11.3 x 11.3


Sensor

1” CMOS


Resolution

4.2 MPixel (2048 x 2048)


Pixel dimensions (µm)

5.5 x 5.5

SDR-WCD-LCM-TEL: effective pixel size is 25   µm

Min. beam (10 pixels)

55 µm

SDR-WCD-LCM-TEL: 250µm

Shutter type

Global


Frame rate @ 2048x2048

≥ 12Hz


Frame rate @ 1024x1024

≥ 30Hz


Frame rate @ 512x512

≥ 60Hz


Max. “every pulse’ PRR

USB 3.0: 12.6 kHz

USB 2.0: 6.3 kHz


Beam Diameter Accuracy

±2% (when used as specified)


Signal to RMS Noise

2500:1, 34/68 dB opt/elec.


Electronic shutter

25000:1, 85µs to 2s USB3.0

12500:1, 158µs to 2s USB 2.0


ADC

12-bit


Interface

USB3.0


Outline & Mounting:

2. SDR-BC2: ½” CMOS Beam Profiling Camera, Ultra Compact, USB3.0

With pixels as small as 3.2 µm, the high resolution and highly compact SDR-BC2 beam profilers have a thickness of only 0.50” (12.84mm) for insertion into tight optical trains and OEM applications.

System Features:

  • 355 – 1150 nm, CMOS detector

    -TEL sensor options for 1480 – 1610 nm

    -UV and 1310 nm options available

  • Two sensor pixel size/resolution options

    -SDR-BC2-XHR: 3.2µm pixels, 3.1 MPixel, 2048 x 1536

    -SDR-BC2-HR: 5.2µm pixels, 1.3 MPixel, 1280 x 1024

  • 6 fps @ 2048 x 1526, 16 fps @ 1024 x 1024, 35 fps @ 512 x 512

  • Port-powered USB 3.0

  • HyperCalTM – Dynamic Noise and Baseline Correction

  • C-mount filters included

  • 1000:1 signal to RMS noise

  • CW/Quasi-CW

  • Electronic auto-shutter, 40µs – 1s (XHR) or 40µs – 500 ms(HR)

  • 10-bit ADC

  • Parallel capture on multiple cameras

  • Field-replaceable image sensors

  • Relative power level display

  • Window-free sensors standard for no fringing

  • ISO 11146 M2 option – beam propagation analysis, divergence, focus

Applications:

  • CW/Quasi-CW

  • Field servicing of lasers and laser-based systems

  • Optical assembly and instrument alignment

  • Bam wander and logging

  • M2 measurements

  • Small form factor for tight optical trains

Model Specifications:

SDR-BC2TM

SDR-BC2-XHR

SDR-BC2-HR

SDR-BC2-HR-TEL

Pixel count

3.2 MPixel

1.3 MPixel

H x V

2048 x 1536

1280 x 1024

Sensor image area (mm)

6.5 x 4.9

6.6 x 5.3

Pixel dimension (µm)

3.2 x 3.2

5.2 x 5.2

25 (due to phosphor)

Min. beam (10 pixels)

32 µm

52 µm

250 µm

wavelength range

355 – 1100 nm

1480 – 1680 nm

Shutter type

Rolling

Max frame rate:

Frame rate @ 2048 x 1536

> 6Hz

N/A

Frame rate @ 1024 x 1024

>16 Hz

Frame rate @ 512 x 512

>35 Hz

Max. ‘every pulse’ PRR

Not suitable for pulse capture

Single pulse capture PRR

Not suitable for pulse capture

Signal to RMS Noise (Optical/Electrical)

1000:1

(30/60 dB)

Electronic shutter dynamic range

40 µs to 1 s 44dB

40 µs to 500ms 41 dB

ADC

10-bit

Interface

USB 3.0/2.0






Outline and Mounting:

3. SDR-TCD-LCM: Large Area CMOS Beam Profiler

With a large 25 x 25 mm active area, 4.2 Mpixels, 12.5 x 12.5 μm (effective) pixels, optical and electronic triggering of a global shutter, and an SNR of 2500:1, the SDR-TCD-LCM beam profiler offers the largest active sensor area on a USB-port powered laser beam profiling device. By combining the high signal-to-noise ratio and global shutter of the SDR-WCD-LCM with a high-quality fiber optic taper, the SDR-TCD-LCM offers a very compact, easy-to-use solution for measuring a variety of large CW or pulsed lasers.

The SDR-TCD-LCM is paired with our full-featured, highly customizable, user-centric software (which has no license fees, unlimited installations, and free software updates). It is perfect for applications including: CW and pulsed laser profiling; field servicing of laser systems; optical assembly; instrument alignment; beam wander and logging; R&D; OEM integration; and quality control.

System Features:

  • 355 - 1150 nm (CMOS)

  • 4.2 MPixel, 2048 x 2048 pixels, 25 x 25 mm active area

  • 12.5μm (effective) pixels

  • 2,500:1 Signal to RMS Noise

  • 60 fps @ 512 x 512, 30 fps @ 1024 x 1024, 12 fps @ 2048 x 2048

  • Port-powered USB 3.0

  • HyperCal™ – Dynamic Noise and Baseline Correction software

  • Includes 2" NDXL ND filters

  • Global shutter with TTL trigger

  • Electronic auto-shutter, 85μs to 2 sec (44 dB)

  • 12-bit ADC

  • Isolated pulse triggering

  • Parallel capture on multiple cameras

  • Relative power level display

Applications

  • CW & pulsed laser profiling

  •  Field servicing of lasers and laser-based systems

  • Optical assembly & instrument alignment

  • Beam wander & logging

4. SDR-Beam’R2/SDR-BeamMap2: Scanning Slit Beam Profilers

Our SDR-Beam'R2 is well suited for many laser beam profiling applications. With both standard 2.5μm slits and larger knife-edge slits, the SDR-Beam'R2 is capable of measuring beams with diameters as small as 2μm. With options for both silicon and InGaAs or extended InGaAs, the SDR-Beam'R2 can profile beams from 190 nm to 2500 nm. Scanning slit instruments offer much higher resolution than camera-based systems.

Our SDR-BeamMap2 represents a radically different approach to real-time beam profiling. It extends the SDR-Beam'R2’s measurement capabilities by allowing for measurements at multiple locations along the beam’s travel. This real-time slit scanning system uses XY slit pairs in multiple z planes on a rotating puck to simultaneously measure four beam profiles at four different z locations. The SDR-BeamMap2’s unique, patented design is most advantageous for real-time measurement of focus position, M2, beam divergence and pointing.

System Features:

  • ISO compliant beam diameter measurements

  • Port-powered USB2.0

  • Auto-gain function

  • Optional stage accessory for ISO 11146 compliant M2 measurements.

  • True2D slits

  • Resolution up to 0.1μm

  • Detector options, 190 – 2500 nm

  • 5 Hz update rate (user adjustable 2-12 Hz)

  • Measure high repetition pulsed lasers

  • Pulsed Minimum PRR = [500/(beam diameter in μm)] kHz

 

BeamMap2 adds the following features

  • Multiple z-plane scanning

  • XYZ profiles, plus θ-Φ

  • Focus position and diameter

  • Real-time M2, Pointing, and Divergence

  • Measure divergence of well-collimated beam in real-time with BeamMap2-Collimate

  • Identify focus with ±1μm repeatability (beam dependent)

  • Optional LensPlate2 for reaching inaccessible beam waists and reimaging waveguides

Applications

  • Very small laser beam profiling

  • Optical assembly and instrument alignment

  • OEM integration

  • Lens focal length testing

  • Real-time diagnosis of focusing and alignment errors

  • Real-time setting of multiple assemblies to the same focus

True2D Slits

  • 0.4μm thick metallic multilayer films on a sapphire substrate

  • Advantages over air slits

  • Avoid tunnel effect

  • Air slits are typically deeper than they are wide, and can buckle under high irradiance

Specifications:

Parameter

Specification

SDR-BeamMap2

SDR-Beam'R2

Comments

Wavelength options:

190-1150 nm, 650-1800 nm, 190-1800 nm, 190-2500 nm

Yes

Yes

Si, InGaAs, Si + InGaAs,

Si + InGaAs, extended

Scanned beam

diameters:

2μm to 4 mm (2 mm for IGA-X.X)

Yes

Yes


X-Y Profile & Centroid

Resolution:

Accuracy:

0.1μm or 0.05% of scan range

± <2% ± ≤0.5μm

Yes

Yes


CW or Pulsed

CW, Pulsed Minimum PRR ≈ [500/(Beam diameter in   μm)]kHz

Yes

Yes


Beam alignment:

± 1 mrad with BeamMap2 ColliMate

Yes

-

Beam Dependent

M2 measurement:

1 to >20, ± 5%

Yes

-

4 Z-plane hyperbolic fit

Real-time update:

5 Hz

Yes

Yes

Adjustable 2-12 Hz

Maximum Power &

Irradiance:

1 W Total & 0.3 mW/μm2

Yes

Yes

Metallic film on Sapphire slits

Gain Range:

32dB

Yes

Yes

12-bit ADC

Display graphics:

All: X-Y position; Profiles.

BeamMap2 only: M2, Focus; Divergence,   Boresight/Pointing

 5. SDR-CAMIR Adapter: A cost-effective Telecom C-band* NIR image converter

  • Extends the range of our standard silicon cameras into the near-infrared 1480 to 1605nm

  • No image fading or lag time

  • Cost effective for beams ≥ 500μm

  • High quality AR coated optics

Applications: The CamIR Adapter* extends silicon camera sensitivity into the near IR range 1480-1605 nm, the telecom C, L & S* bands. This C-Mount module attaches to our standard cameras.

Technology: A proprietary phosphor converts 1480-1605 nm photons to Silicon CMOS/ CCD detectable wavelengths image to the attached CMOS/CCD camera at a demagnification of x0.29 (PMF=3.5) to give an effective active area of 22 x 16.5 mm with a ½", 1/1.8", ⅔", or 1" cameras.

The effective pixel size is 3.5 x the actual pixel size, but due to the phosphor, the primary limitation is the phosphors point spread function of ~70μm FWHM, and ~200μm at 1/e2.

The response to incoming irradiance is logarithmic. This is automatically corrected in our software, by setting the Gamma in Setup to 1.41. Like any phosphor, the response is spatially non-uniform. Typical beam diameter measurement accuracy is around 5 to 10%.

Performance and Pricing: This technology is better than the low resolution and image lag of IR vidicons, yet less sensitive and less uniform than InGaAs arrays.


*S-band: 1460 - 1530, C-band: 1530 - 1565, L-band: 1565 - 1625

Technical Specifications:


Optical Characteristics


Active Area

27.5 mm

IR Spectral Sensitivity

1480 - 1605 nm (see curve)

Peak IR Sensitivity

1510/1540 nm (see curve)

Maximum Resolution

12lp/mm over active area

Converter IR Output

950 - 1075nm

Distortion

-1.0% Barrel Distortion (Inverted   Image)

Linearity

Non-Linear IR converter output ~   (IR input intensity)1.41

Maximum Illumination

1W/cm2 (damage may occur if this   limit is exceeded)

Other Characteristics


Dimensions

Φ 46 mm x L 97 mm

Operating Temperature

-10⁰ C to +40⁰ C

Weight

210g

Requirements


Mount

C-Mount (adapter supplied)

Effective Aperture

17 mm, 19 mm, 23 mm, 27.5 mm

Camera Format

½", 1/1.8", ⅔", 1" formats

Application Areas

  •  Beam intensity profiling of telecom diodes/devices

  •  Imaging optical outputs of components such as optical fiber ends, amplifiers, routers and switchers, fiber gratings, splitters and couplers

  •   On Line Production Alignment and Characterization –Real time Lens focusing

  •   Stability Testing- Beam Wander over time

  •   Divergence measurements

  •   Co-Linear Measurements Aligning two lasers

  •   Multiple Image separation Measurements (distance between peaks)

  •   Measure Relative Intensity

For researchers requiring higher resolutions. We offer the phosphor coating applied directly onto the sensor. This improves the point spread function to ~ 35μm FWHM.

This option is offered on the following cameras:

Model

Description

SDR-WCD-LCM1-NIR

1” CMOS USB   3.0/2.0 system with phosphor coating for 1480 to 1605nm.

SDR-WCD-UHR-NIR

½” CMOS   system with phosphor coating for 1480 to 1605 nm.

SDR-BladeCam-UHR-NIR

½” CMOS   system with phosphor coating for 1480 to 1605 nm.

SDR-WCD-UCD12-NIR

½” CCD   system with phosphor coating for 1480 to 1605 nm.

SDR-WCD-UCD23-NIR

⅔” CCD system with phosphor coating   for 1480 to 1605 nm.

SDR-TCD20-15-UCD23-NIR

20 x 15 mm   CCD system with phosphor coating for 1480 to 1605 nm.

6. SDR-ILMS: Industrial Laser Monitoring System (ILMS)

The SDR-ILMS is designed for profiling focused, high-power industrial lasers. This system combines reimaging/magnification optics, a polarization preserving beam sampler, and a DataRay beam profiler to measure small beam waists which would otherwise damage a traditional profiling system.  Magnification of the focused beam allows full pixel-by-pixel 2D measurements of beam spots as small as a few microns.

The SDR-ILMS is compatible with most DataRay profilers and supported by the full-featured, highly customizable, and user-centric software (included without licensing fees).  The software automatically accounts for the magnification of the system, so results do not require post processing or corrections.

 

System Features:

  • lUV, visible, NIR, MWIR, SWIR, eSWIR and FIR  options.

  • High magnification options available (50X and beyond)

  • High-power beams (handling up to kWs)

  • Three swappable filters for flexible, fine attenuation

  • Profiler easily removed from system for stand-alone use

  • Optional calibrated pinhole apertures

  • Integrated power meter and beam dumps available

  • Profiling beam waist diameters down to a few µm.

Applications:

  • Tightly focused beams, fiber ends, edge couplers, laser diodes and more.

  • High power laser cutting systems

  • Additive manufacturing

  • Quality control

Application Examples – Additive and Subtractive Manufacturing

F-theta lenses are useful in additive and subtractive manufacturing for their ability to focus high-power beams over a range of XY locations at the focal plane.  It is often useful to observe detailed 2D profiles of these focused beams.

Example: A 160-mm focal length F-theta lens focuses a 3.5-mm diameter collimated 343-nm laser to a minimum beam waist diameter of roughly 26 µm.  The pixel size of traditional profiling cameras makes it challenging to accurately profile a waist this small.  However, since the SDR-ILMS-5-UV utilizes magnification optics, full 2D profiles of tightly focused beam are possible, allowing you to diagnose hard-to-find issues such as hot spots or unexpected beam ellipticity.

Application Examples – Inaccessible Beam Waists

In many applications a beam waist is not accessible for measurements.  Examples include the output facet of VCSELS, the end of optical fibers, or short working distance focusing optics.  The SDR-ILMS easily reimages inaccessible beam waists making it possible to tackle these difficult applications.

Example: We need to profile the end of a 7-µm core diameter, single mode fiber being used with a 1064-nm fiber-coupled source.  The optics in our SDR-ILMS-50-1064 magnify the fiber end onto a SDR-WCD-LCM.  It is challenging to position a traditional profiler close enough to the fiber for near-field profiling.

Standard Configurations:

Model

Magnification

AR coating wavelength (nm)

Input NA

System Dimensions (mm)

Typical spot size (1/e2, µm)

SDR-ILMS-5-UV

5x

250-425

0.17

 

70.0 x 133.3 x 176.3

11

SDR-ILMS-5-VIS

5x

425-675

0.17

11

SDR-ILMS-5-NIR

5x

750-1550

0.17

11

SDR-ILMS-10-UV

10x

250-425

0.17

 

70.0 x 133.3 x 252.5

5.5

SDR-ILMS-10-VIS

10x

425-675

0.17

5.5

SDR-ILMS-10-NIR

10x

750-1550

0.17

9

SDR-ILMS-50-532

50x

495-570

0.6

 

70.0 x 133.3 x 328.7

2

SDR-ILMS-50-1064

50x

980-1130

0.65

3

Drawings:

7. SDR-LLPS: Line Laser Profiling System (LLPS)

The Line Laser Profiling System (LLPS) is a complete solution for analyzing line lasers up to 200mm in length and down to 55 µm in width.  By scanning Flagship SDR-WCD-LCM beam profiling camera cross the length of the beam using 200mm linear stage, the full-featured, free software will display a full image of the line laser intensity distribution along with a vertical centroid plot, line width plot and several other useful measurements.

The line laser profiling system is supported by full-featured, highly customizable, user-centric software which has no license fees, unlimited installations, and free software updates.  The software controls the movements of the stage, automatically configures the optimal exposure time for the line laser scan, and provides an analysis of the line.

 

Software features:

  • Automatic exposure configuration

  • Custom Start/End locations

  • Automatic PDF report generation

  • Residual sensor tilt compensation

  • Export data to Excel or CSV

  • Save/load line laser files (*.l_wcf)

System Features:

Part number

SDR-LLPS-50

SDR-LLPS-200

Translation stage

50mm

200mm

  • Line laser length/width measurements

  • Absolute vertical centroids

  • Deviation of vertical centroids from a linear regression line

  • Line tilt measured in degrees

  • 190 to 1150nm, CMOS detector

    -4.2 MPixel, 2048 x 2048 pixels

    -11.3 x 11.3 mm active area

    -5.5 µm pixel size

  • HyperCalTM – Dynamic Noise and Baseline Correction software

  • 2500:1 signal to RMS noise

  • 12-bit ADC

  • Window-free sensors standard to prevent fringing

Applications:

  • Calibration

  • Machine Vision

  • 3D scanning

  • Particle counting

  • ·Survey Instruments

SFC Series Far Field Beam Scanner

Hemispherical 3D Beam Profiling

 

The far-field measurement instrument is a stand-alone device for measuring light intensity vs output angle of light emitting components such as high-power laser diodes, LEDs, fibers and other high-intensity light sources.

Highlights:

  • Wide wavelength range

  • Goniometric detector design

  • Fast scanning speed

  • High sampling resolution

The SFC series far-field scanner has been designed to fulfill the increasing demands on beam quality analysis and testing of light emitting components. The features of the far-field scanner include wide operating and measuring ranges. This all can be done without sacrificing speed performance – a typical measurement cycle takes only seconds, making it ideal for production testing of light emitting components.

Application:

  • Optical power distribution

  • Far-field & NA analysis measurement

  • Quality control of optical sources

Software Features:

  • Easy setting of scan parameters

  • Automatic archiving of results

  • Advanced plotting features: 1D/2D/3D & contour/polar plots

  • Export of data into various fi le formats: CSV, PDF, PNG, PS, XML, etc.

  • Numerical analysis of results

  • Customizable to match customer's needs

  • Integration into automated measurement systems

  • Online submission
  • Send us a message

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