Fiber Collimator & Focusing

STS Series High-power Fiber Collimator & Focusing

Ordering Information:  STS-xxx-fff, where xxx means input fiber connector such as D80, QBH, SMA905 etc., fff means the focal length of the focal lens in mm such as 80, 150 or 210mm.

STC Series Collimators and STF Series Focus Guides

Our collimators and focus guides are for use in a wide variety of optical systems. These ruggedized modules are designed to collimate or focus light exiting an optical fiber to a desired beam diameter or spot size a specific distance away. Collimators and focus guides are used with laser diodes, photodiodes, acoustic-optic modulators and other fiber optic devices where a specific output is needed.

STANDARD SPECIFICATIONS

• Collimator Focal Lengths: Micro (10mm), Mid-Size (18mm), Macro (38mm)

• Focus Guide Focal Lengths: Mid-Size (18mm, 25mm, 38mm), Macro (38mm, 51mm, 76mm)

• Fiber Type: Single Mode, Multimode

• Core Sizes: Micro up to 400μm; Mid-Sized: 400μm - 800μm; Macro: 800μm - 1000μm

• Wavelengths: UV - IR: 190nm - 2400nm

• Numerical Aperture (NA): 0.12, 0.22, 0.26, 0.37

• Lens Materials: BK-7, Silica

• Connector Options: SMA905, FC, ST

• Standard Temperature Range: -40°C to +100°C / -40°F to +212°F

APPLICATIONS:

• Free Space Coupling • Process Sampling • Astronomy • Metrology • Quantum Optics • Imaging

Note: Collimator Beam Diameter: The beam diameter of a collimated beam is given by the following formula:

D = 2*f*NA where

• D = Beam Diameter in Millimeters

• f = Lens Focal Length in Millimeters

• NA = Fiber Numerical Aperature

1. MICRO COLLIMATOR

• Length: 23.37mm (0.92”)

• Outside Diameter: 6.35mm (0.250”)

• Material: Stainless Steel

Note: Collimator Divergence (milliradians) = Fiber Diameter (μ) / 10mm (Lens Focal Length). For use with Fibers with up to 400μm Cores

Micro Collimator - STC005B0101 & STC005S0101, 5mm Lens Diameter, NA of the fiber = 0.22

2. MID-SIZE COLLIMATOR

Note: Collimator Divergence (milliradians) = Fiber Diameter (μ) / 18mm (Lens Focal Length). For use with Fibers with 400μm - 800μm Cores

Mid-Size Collimator - STC012B0181 & STC012S0181, 12mm Lens Diameter, NA of the fiber = 0.22

3. MACRO COLLIMATOR MACRO FOCUS GUIDE

Note: Collimator Divergence (milliradians) = Fiber Diameter (μ) / 38mm (Lens Focal Length). For use with Fibers with 800μm - 1000μm Cores

Macro Collimator - STC025B0381 & STC025S0381, 25mm Lens Diameter, NA of the fiber = 0.22

STOZ Series High Power Collimators

Collimators are devices that collimate/focus light exiting an optical fiber to a desired beam diameter or spot size. The lenses are diffraction limited, so they can achieve spot sizes down to a few microns. Lenses also feature an antireflection coating for low back reflection. Optimum performance for long-term use is ensured by the factory set and tested lens alignment. Typical applications can include use with fiber coupled lasers, pigtailed receptacles, etc.

1. HC & HPMC Series High Power Collimators

• For MMC: Above specifications are for device without connector. For devices with connectors, IL will be 0.2dB higher and RL will be 20dB lower.

2. STOZ-MMLBC Series High Power MM Large Beam Collimators

• For special pulse applications, please discuss with us.

• The material must be RoHS compliant.

• The actual dimensions may be different from above drawing due to different requirements, please see shipment data sheet

Ordering Information

10.6um Fiber/Lens Objectives for Refocusing & Collimating

Features:

• Compatible with SMA-terminated fiber cables

• NA=0.35, Pupil diameter 14 mm

• Refocusing or collimating design

Applications:

• Focusing of collimated beam into fiber

• Collimation of output beam from fiber

• Fiber end imagination to detector / emitter element

Technical parameters:

• Z-translation stage adjustable in ±5 mm range Lens parameters

• ZnSe or Ge - on request

• Ø15 mm; f = 20 mm or 10 mm - on request

• AR - coating for 3-5.5μm or 8-12μm - on request

Technical References

1) Theoretical Approximation of the Divergence Angle:

The pergence angle listed in the specifications table above is the measured beam pergence angle when using the fiber collimator at its design wavelength with the specific fiber denoted in the specifications table footnote. This pergence angle is easy to approximate theoretically using the formula shown below as long as the light emerging from the fiber has a Gaussian intensity profile. This works well for single mode fibers, but will underestimate the pergence angle for multimode fibers where the light emerging from the fiber has a non-Gaussian intensity profile.

The pergence angle (in Degrees): pergence angle =(D/f)*(180/3.1415927)

where D and f must be in the same units. θ  is Divergence Angle, D is Mode-Field Diameter (MFD) and  f is Focal Length of Collimator

Example Calculation:

When the SF220SMA-A collimator is used to collimate 515 nm light emerging from a 460HP fiber with a mode field diameter (D) of 3.5 µm and a focal length (f) of approximately 11.0 mm (not exact since the design wavelength is 543 nm), the pergence angle is approximately given by

θ ≈ (0.0035 mm / 11.0 mm) x (180 / 3.1416) ≈ 0.018°.

When the beam pergence angle was measured for the SF220SMA-A collimator a 460HP fiber was used with 543 nm light. The result was a pergence angle of 0.018°.

2) Optical Coating:

3) Collimation Package Selection Guide:

We offer several different families of collimation packages, which are summarized in the table below. Our selection of fixed fiber collimators include packages with aspheric lenses, which mate with SMA and FC connector. For larger beams, our air-spaced doublet collimators are ideal.