Fiber Collimator & Focusing

Fiber Collimator & Focusing

Keywords: Fiber Probes,Fiber Collimator, focus guide, high-power
Sep 12, 2020 View: 3235 Data Sheet

These fiber collimation packages are pre-aligned to collimate light from an SMA connectorized fiber with diffraction-limited performance. They are compact and not susceptible to misalignment.

STS Series High-power Fiber Collimator & Focusing

Part numberSTS-xxx-fff
Input connectorQBH
Transmission @915nm98%
Wavefront distortionλ/4 @915
Focal length80/150/210mm
Spot diameter @1km5m
Output beam divergenceAdjustable
CoolingWater cooling
Outline dimension50x50x200mm

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.

fiber collimator


  • 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


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

Part NumberFunctionLensFocal Length


STF012B0180Focus GuideBK-718mm
STF012B0250Focus GuideBK-725mm
STF012B0380Focus GuideBK-738mm
STF012S0180Focus GuideSilica18mm
STF012S0250Focus GuideSilica25mm
STF012S0380Focus GuideSilica38mm

STF025B0380Focus GuideBK-738mm
STF025B0510Focus GuideBK-751mm
STF025B0760Focus GuideBK-776mm
STF025S0380Focus GuideSilica38mm
STF025S0510Focus GuideSilica51mm
STF025S0760Focus GuideSilica76mm

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


  • 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


Length34.29mm (1.35”)16.38mm
Outside Diameter15.88mm (0.625”)15.88mm
MaterialAnodized AluminumAnodized Aluminum

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


Outside Diameter28.5828.58
MaterialAnodized AluminumAnodized Aluminum

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.


High handling Power
High extinction ratio
Low Insertion Loss
High Return Loss
High environmental stability


Free Space Communications
Fiber Lasers
Fiber Optic Components
PM components
Free space communications

1. HC & HPMC Series High Power Collimators

Collimator Type
High power Collimator (HC)High power Collimator (HC)High power Collimator (HC)High power Collimator (HC)High power Polarisation Maintaining Collimator (HPMC)Multi mode collimator (MMC)
Center Wavelengthnm10641310148015501064850, 980, 1064, 1310, 1480, 1550
Operating Wavelength Rangenm±20±20±20±20±20±30
Nominal Beam Diametermm0.4  ,0.5 , 0.9  or Specify0.4 ,0.5 or Specify0.4 ,0.5 or Specify0.4 ,0.5 or Specify0.4  ,0.5 , 0.9  or Specify
Working Distancemm50 or Specify5 or Specify5 or Specify5 or Specify50 or Specify5 or Specify
Typ. Insertion LossdB0.2~0.4 (at 50mm WD)0.2 (at 5mm WD)0.2 (at 5mm WD)0.2 (at 5mm WD)0.2~0.4 (at 50mm WD)0.2 (at 5mm WD)
Max. Insertion LossdB0.5 (at 50mm WD)0.3 (at 5mm WD)0.3 (at 5mm WD)0.3 (at 5mm WD)0.5 (at 50mm WD)0.25 (at 5mm WD)
Min. Return LossdB505050505035
Typ. Extinction RatiodB----25-
Min. Extinction RatiodB----22-
Max. PDLdB0.
Max. Optical Power (CW)W3,  5,  10,  20,30 or Specify3 ,5,  10,  20  or Specify3 , 5,  10,  20  or Specify3 , 5,  10,  20  or Specify3,  5,  10,  20,30 or Specify0.5
Fiber Type
1 - HI 10601 - SMF-28e1 - SMF-28e1 - SMF-28e1 – PM 980 Panda
2 – PM 10/125 NA 0.08
3 – PM 15/130 NA 0.08
Multimode Fiber 62.5/125 or 50/125
Max. Tensile LoadN555555
Operating Temperature-5 to +70-5 to +70-5 to +70-5 to +70-5 to +70-5 to +70
Storage Temperature-40 to +85-40 to +85-40 to +85-40 to +85-40 to +85-40 to +85
  • 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

Part NumberUnitSTOZ-MMLBC-06-20-B-10-4-2-3
Center Wavelength (λc)nm1064 or Specify
Operating Wavelength Rangenm±20
Nominal Output Beam Dia.mm2.0+/-0.8@ over 5~10mm from Output Surface
Typ. Transmission-98%
Min. Transmission-95%
Typ. Peak IsolationdB30~35
Min. Return LossdB25
Max. Optical Power (CW)W20, 50 or Specify
Max. Beam Divergence Angle (Full Angle)mrad45
Min. Elipticity-0.92
Max. Tensile LoadN5
Outer Package Materials
Stainless Steel/Aluminum
Operating Temperature-5 to +70
Storage Temperature-20 to +85
  • For special pulse applications, please discuss with us.

  • The material must be RoHS compliant.

fiber collimator

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

Ordering Information

fiber collimator

10.6um Fiber/Lens Objectives for Refocusing & Collimating


  • Compatible with SMA-terminated fiber cables

  • NA=0.35, Pupil diameter 14 mm

  • Refocusing or collimating design


  • 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.

FamilyBrief Description
Fixed FC or SMA Fiber CollimatorsThese collimators are designed to couple a free-space laser beam into an optical fiber. Each collimation package is factory aligned to provide diffraction-limited performance at one of six wavelengths: 405, 543, 633, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at detuned wavelengths, they will only perform optimally at the design wavelength due to chromatic aberration, which causes the effective focal length of the spheric lens to have a wavelength dependence.
Low Divergence CollimatorsFor large beam diameters (Ø6.6 - Ø8.5 mm), we offer FC/PC, SMA, and FC/APC air-spaced doublet collimators. These collimation packages are pre-aligned at the factory to collimate a laser beam propagating from the tip of an FC or SMA conectorized fiber and provide diffraction-limited performance at the design wavelength.
Adjustable Fiber CollimatorsThese snap-on collimators are designed to connect onto the end of an FC/PC or FC/APC connector and contain an AR-coated aspheric lens. The distance between the aspheric lens and the tip of the FC-terminated fiber can be adjusted to compensate for focal length changes or to recollimate the beam at the wavelength and distance of interest.
Pigtailed CollimatorsOur pigtailed collimators come with one meter of either single mode or multimode fiber, have the fiber and AR-coated aspheric lens rigidly potted inside the stainless steel housing, and are collimated at one of five wavelengths: 532, 1030, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength.
GRIN Fiber CollimatorsWe offer four gradient index (GRIN) fiber collimators that are aligned for either 1310 nm or 1550 nm and have either FC connectorized or unterminated fibers. Our GRIN collimators feature a Ø1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard Corning SMF-28 single mode fibers.
GRIN LensesThese graded-index (GRIN) lenses are AR coated for applications at 1300 or 1560 nm that require light to propagate through one fiber, then through a free-space optical system, and finally back into another fiber. They are also useful for coupling light from laser diodes into fibers, coupling the output of a fiber into a detector, or collimating laser light.
Pigtailed FerrulesOur pigtailed ferrules have broadband AR coatings centered at either 1310 nm or 1550 nm and are available with either a 0 o or 8 o angled face. These pigtailed ferrules include 1.5 meters of SMF-28e fiber.
FiberPortsThese new compact, ultra-stable FiberPort micropositioners provide an easy-to-use, stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated optical fibers. It can be used with single mode, multimode, or PM fibers and can be mounted onto a post, stage, platform, or laser. The built-in aspheric lens is available with three different AR coatings and has five degrees of alignment freedom (3 translational and 2 rotational). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.
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