Features

Compact Fiber Collimation Package
SM Fiber Pigtail with FC/PC or FC/APC Connectors Available
Custom Wavelength and Connectors Available
Non-Magnetic Stainless Steel Housing

The CFS series of pigtailed fiber collimators is a compact solution for OEM applications. The collimation package consists of a stainless steel housing and an aspheric lens. Each unit uses 1 m of single mode fiber pigtailed to the collimation package so that the performance of the collimator is diffraction limited at the design wavelength. The fiber end pigtailed to the collimation package is AR-coated to minimize reflections at the design wavelength. In addition, this fiber end is flat polished for the CFS2 and CFS5 series collimation packages and angle polished a for the CFS11 and CFS18 series collimation packages. To accommodate the angle polish, the CFS11 and CFS18 collimators have an angled housing (see the Documents & Drawings tab for more information). The other end of the fiber has an FC/PC, narrow key connector for the 532, 1030, and 1064 nm wavelength packages and an FC/APC, narrow key connector for the 850, 1310, and 1550 nm wavelength packages. These collimation packages can be easily customized for any wavelength in the visible and near IR spectral regions. In addition, the fiber connector, fiber type, and fiber length can all be customized; please contact Technical Support for a quote.

General Specifications

Insertion Loss	Fiber Length
<0.2 dB	1 m

Optical Performance Specifications

Item #	EFL (mm)	Input MFD¹ (μm)	Output Waist Dia.² (mm)	Full Angle Beam Diverg. (mrad)	CA³ (mm)	NA⁴	Align. λ (nm)	Fiber Type	Return Loss (dB)	AR Coating Range of Aspheric Lens (nm)	Fiber Connector⁵
CFS2-532-FC	1.97	3.5	0.39	1.75	2.0	0.51	532	460HP	40	400-600	FC/PC
CFS18-532-FC	18.04	3.5	3.6	0.19	5.5	0.15	532	460HP	40	400-600	FC/PC

CFS11-850-APC	11.10	5.6	2.1	0.50	5.4	0.24	850	SM800-5.6-125	55	650-1050	FC/APC
CFS18-850-APC	18.45	5.6	4.0	0.28	5.5	0.15	850	SM800-5.6-125	55	650-1050	FC/APC

CFS2-1030-FC	2.01	6.0	0.44	3.00	2.0	0.50	1030	HI1060-J9	40	650-1050	FC/PC
CFS5-1030-FC	4.67	6.0	1.0	1.30	3.6	0.39	1030	HI1060-J9	40	650-1050	FC/PC
CFS11-1030-FC	18.56	6.0	2.4	0.55	5.4	0.24	1030	HI1060-J9	40	650-1050	FC/PC
CFS18-1030-FC	18.4	6.0	4.0	0.33	5.5	0.15	1030	HI1060-J9	40	650-1050	FC/PC

CFS2-1064-FC	2.02	6.2	0.44	3.10	2.0	0.50	1064	HI1060-J9	40	1050-1620	FC/PC
CFS5-1064-FC	4.67	6.2	1.0	1.35	3.6	0.39	1064	HI1060-J9	40	1050-1620	FC/PC
CFS11-1064-FC	11.17	6.2	2.4	0.56	5.4	0.24	1064	HI1060-J9	40	1050-1620	FC/PC
CFS18-1064-FC	18.57	6.2	4.0	0.34	5.5	0.15	1064	HI1060-J9	40	1050-1620	FC/PC

CFS2-1310-APC	2.03	9.2	0.54	3.10	2.0	0.49	1310	SMF-28-J9	40	1050-1620	FC/APC
CFS5-1310-APC	4.70	9.2	0.83	2.00	3.6	0.38	1310	SMF-28-J9	40	1050-1620	FC/APC
CFS11-1310-APC	11.25	9.2	2.0	0.84	5.4	0.24	1310	SMF-28-J9	55	1050-1620	FC/APC
CFS18-1310-APC	18.67	9.2	3.3	0.50	5.5	0.15	1310	SMF-28-J9	55	1050-1620	FC/APC

CFS2-1550-APC	2.03	10.4	0.38	5.20	2.0	0.49	1550	SMF-28-J9	40	1050-1620	FC/APC
CFS5-1550-APC	4.73	10.4	0.87	2.26	3.6	0.38	1550	SMF-28-J9	40	1050-1620	FC/APC
CFS11-1550-APC	11.31	10.4	2.1	0.95	5.4	0.24	1550	SMF-28-J9	55	1050-1620	FC/APC
CFS18-1550-APC	18.75	10.4	3.5	0.57	5.5	0.15	1550	SMF28-J9	55	1050-1620	FC/APC

1) Mode-Field Diameter of Pigtailed Fiber
2) Measured 1/e2 Diameter at 1 Focal Length from Lens
3) Clear Aperture of the Aspheric Lens
4) Numerical Aperature of the Aspheric Lens
5) Narrow 2.0 mm Key Connectors

Fiber Collimator Selection Guide

Click on the collimator type or photo to view more information about each type of collimator.

Type		Description
Fixed FC, APC, or SMA Fiber Collimators		These fiber collimation packages are pre-aligned to collimate light from an FC/PC-, FC/APC-, or SMA-connectorized fiber. Each collimation package is factory aligned to provide diffraction-limited performance at one of six wavelengths: 405, 543, 633, 780, 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.
Air-Spaced Doublet, Large Beam Collimators		For large beam diameters (Ø6.6 - Ø8.5 mm), Thorlabs offers 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 Collimators		These 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.
FiberPorts		These 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 or achromatic lens is available with three different AR coatings and has five degrees of alignment adjustment (3 translational and 2 pitch). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.
Triplet Collimators		Thorlabs' High Quality Triplet Fiber Collimation packages use air-spaced triplet lenses that offer superior beam quality performance when compared to aspheric lens collimators. The benefits of the low-aberration triplet design include an M² term closer to 1 (Gaussian), less divergence, and less wavefront error.
Reflective Collimators		Thorlabs' metallic-coated Reflective Collimators are based on a 90° off-axis parabolic mirror. Mirrors, unlike lenses, have a focal length that remains constant over a broad wavelength range. Due to this intrinsic property, a parabolic mirror collimator does not need to be adjusted to accommodate various wavelengths of light, making them ideal for use with polychromatic light. Our reflective collimators are ideal for single-mode fiber.
Pigtailed Collimators		Our 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 six wavelengths: 532, 830, 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 Collimators		Thorlabs offers gradient index (GRIN) fiber collimators that are aligned for either 980, 1064, 1310, or 1550 nm and have either FC connectorized, APC 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 single mode or graded-index multimode fibers.
GRIN Lenses		These graded-index (GRIN) lenses are AR coated for applications at 630, 830, 1060, 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. Our GRIN lenses are designed to be used with our Pigtailed Glass Ferrules and GRIN/Ferrule sleeves.

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Posted Comments:

Poster: tcohen

Posted Date: 2012-08-21 16:18:00.0

Response from Tim at Thorlabs: The lower limit is typically 450nm due to the limitations of the housing. Also, as you mentioned we would need to use alternative optics as the standard lenses we use have very limited transmission at 200nm that would prevent this from being useful. Furthermore, the cutoff for our lowest operating wavelength silica core SMF (SM300) is approximately 310nm. I will contact you to discuss the requirements of the fiber and collimator. Perhaps a UV-Enhanced Aluminum reflective collimator such as the RC08FC-F01 would be better able to meet your requirements.

Poster: jlowder

Posted Date: 2012-08-21 10:34:51.0

Hello, I was wondering if you can get any of these with fused silica optics or something similar for wavelengths between 200nm-400nm. Thanks.

Poster: tcohen

Posted Date: 2012-05-11 16:17:00.0

Update from Tim at Thorlabs to clarify an unclear previous post: I would like to mention that the max waist distance calculated was the theoretical limit that the beam waist could be placed based on the fiber and collimation optic. When manufacturing these, we look to minimize divergence and because small changes in the distance between the fiber and the optic will cause significant changes in the waist distance, the beam waist distance may vary.

Poster: tcohen

Posted Date: 2012-05-04 16:53:00.0

Response from Tim at Thorlabs: Thank you for your feedback. The coupling efficiency will depend on alignment. Lateral offset, separation and tilt will all play a role. I see you have posted on a couple feedback and mentioned your source is also variable. Chromatic focal length shift will also decrease the coupling efficiency. We do have adjustable fiber collimators to compensate for this shift as well as FiberPorts which offer linear and angular movement. I will contact you to discuss the options that may suit your application.

Poster: scottie730318

Posted Date: 2012-05-04 11:34:37.0

Hi, If I buy the two Pigtailed Aspheric Fiber Collimators (CFS5-1064-FC). One of the Fiber Collimators is collimating the beam out of Hi-1060 fiber, and focusing the collimation beam into the another Fiber collimator. What distance is the distance to the highest coupling efficiency? What valve is the coupling efficiency? Thanks

Poster: tcohen

Posted Date: 2012-04-11 11:28:00.0

Response from Tim at Thorlabs: There will be a few things to consider. First, it is important to know that imperfect coupling and contaminants can both lower the damage threshold. Next, the energy density must be considered for both the coated lens and the focused spot in the fiber. To calculate this, we would need your beam diameter and intensity profile. If you are coupling into this fiber, it is also important to remember that these are pre-aligned for the design wavelength. A deviation in wavelength will cause a focal length shift and therefore may focus the spot inappropriately on the fiber where it can be damaged more easily. Also, because of your ultrashort pulse, damage may occur by avalanche ionization, which has different thresholds than normal pulsed and CW LIDT. I have contacted you to further discuss the suitability of this product in your setup.

Poster: scottie730318

Posted Date: 2012-04-07 10:51:39.0

Hi, what would the maximum power rating be for CFS5-1064-FC, and CFS11-1064-FC. Average power of our laser is about 50mW, repetition rate is 30MHz, pulse with is about 300fs Are the CFS5-1064-FC and CFS11-1064-FC suitable to our laser system. Or would you recommend these or another lens for close work in our laser. Thanks, Hou-Ren Chen

Poster: tcohen

Posted Date: 2012-03-29 14:53:00.0

Response from Tim at Thorlabs: The maximum waist distance can be approximated by zmax = f + 2*lambda*f^2 / pi*MFD^2. For the CFS5-1064-FC with about 1060 nm, that would be 4.6 mm + 2(1060nm)(4.6mm)^2 / pi*(6.2um)^2 or about 376mm.

Poster: scottie730318

Posted Date: 2012-03-20 01:02:43.0

What distance is the max waist distance (CFS5-1064-FC) with about 1060 nm ?

Poster: bdada

Posted Date: 2012-02-07 14:22:00.0

Response from Buki at Thorlabs: Thank you for participating in our feedback forum. As a guideline, the anti-reflective coatings on our aspheric lenses can withstand 100 W/cm2 CW input power or 0.1 J/cm2 with 10 ns pulses energy at 1064 nm. However, within the collimation packages, we have found that a damage threshold of 25W/cm^2 is advisable. Please contact TechSupport@thorlabs.com if you have additional questions.

Poster: rumbaulk

Posted Date: 2012-02-04 23:17:39.0

Hi, what would the maximum power rating be for these lenses? Would you recommend these or another lens for close work in and out of fibers with up to 30W signals? Thanks, Luke Rumbaugh

Poster: bdada

Posted Date: 2011-08-22 16:01:00.0

Response from Buki at Thorlabs: The aspheric lens in the particular collimator you are looking at, the CFS18-532-FC, is the 352280-A. The NA is 0.15 and the RMS wave front error is diffraction limited, so this should be sufficient for your application. Please contact TechSupport@thorlabs.com if you have further questions.

Poster: ziqiangliu

Posted Date: 2011-08-21 22:08:33.0

Dear Sir/Madam, We need several aspheric fiber colllimator in 532nm. We need use the collimator at 300m distance. I need the NA is 0.15, MFD 3.5um, waist dia. less than 20mm,divengence less than 0.2mrad. It looks the CFS18-532-FC suit for our application. But mostly we concerned is the wave phase differencial should be less than 1/4 lambada. The colliatomator we used now have a clear diffraction ring at 300m distance. Is the CFS18-532-FC suit for our application? Or you have another better recommendation? Best regards, Jeffery Liu

Poster: jjurado

Posted Date: 2011-02-28 13:57:00.0

Response from Javier at Thorlabs to lpnirpol: Thank you for contacting us with your inquiry. Although we have not tested these fiber couplers in a fiberbench configuration like the FFBM-S-1550-Y, we expect the insertion loss to be very close to that of this fiber bench coupler when both collimators are used in a similar configuration. So you can expect an insertion loss of 0.6 dB (+/- 0.3 dB).

Poster: lpnirpol

Posted Date: 2011-02-25 16:47:40.0

Can you give the minimum expected insertion loss for when pairing these collimators like in the Permanent Pigtailed Fiber-Fiber Coupler product (FFBM-S-1550-Y).

Poster: Greg

Posted Date: 2010-04-14 10:55:29.0

A response from Greg at Thorlabs to logly1019: I have added links to our small V-Clamps in the tables above each price box. These clamps are well suited to mount these pigtailed collimators. The adapter Adam mentioned will also work for the CFS18 models. I will have our engineering team look at adding additional SM1 style adapters for our other pigtailed collimators.

Poster: Adam

Posted Date: 2010-04-14 08:49:29.0

A response from Adam at Thorlabs to logly1019: The CFS18-850-APC can be mounted in SM1 threads using a AD9.5F.

Poster: logly1019

Posted Date: 2010-04-13 22:33:10.0

What kind adapter can use for CFS18-850-APC? thanks.

Poster: apalmentieri

Posted Date: 2009-02-24 11:09:29.0

On this page there are no accessories or related items linked. Under related items, it may be a good idea to link fiberports, adjustable collimators, and fixed collimators. Under accessories, it may be a good idea to link fiber coupled laser sources, pigtailed laser diodes, and mating sleeves.

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Pigtailed Aspheric Fiber Collimators

Features

General Specifications

Optical Performance Specifications

Fiber Collimator Selection Guide