Molded Glass Aspheric Lenses, 1050 - 1620 nm or 1050

Overview
Fiber Coupling
Lens Equation
Collimation Tutorial
Feedback
Selection Guide

Aspheric Lens Selection Guide
Uncoated
350 - 700 nm (-A Coating)
600 - 1050 nm (-B Coating)
1050 - 1700 nm (-C Coating)
1.8 - 3 µm (-D Coating)
3 - 5 µm (-E Coating)
8 - 12 µm (-F Coating)
405 nm V-Coating
1064 nm V-Coating

Webpage Features
	Click for complete specifications.
Performance Hyperlink	Click to view item-specific focal length shift data and spot diagrams at various wavelengths.

Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.

Molded Glass Aspheric Lenses: 1050 - 1620 nm or 1050 - 1700 nm Broadband AR Coating

Aspheric lenses focus or collimate light without introducing spherical aberration into the transmitted wavefront. For monochromatic sources, spherical aberration often prevents a single spherical lens from achieving diffraction-limited performance when focusing or collimating light. Thus, an aspheric lens is often the best single element solution for many applications including collimating the output of a fiber or laser diode, coupling light into a fiber, spatial filtering, or imaging light onto a detector.

All of these molded glass lenses are also available premounted in non-magnetic 303 stainless steel lens cells that are engraved with the part number for easy identification. These mounted aspheres have a metric thread that makes them easy to integrate into an optical setup or OEM application. The mounted aspheres are readily adapted to our SM1 series of lens tubes by using our Aspheric Lens Adapters. Mounted aspheres can be used as a drop-in replacement for multi-element microscope objectives by combining the lens with our Microscope Objective Adapter Extension Tube.

Click to Enlarge
Click Here to Download the Raw Data

If an unmounted aspheric lens is being used to collimate the light from a point source or laser diode, the side with the greater radius of curvature (i.e., the flatter surface) should face the point source or laser diode. To collimate light using one of our mounted aspheric lenses, orient the housing so that the externally threaded end of the mount faces the source.

Molded glass aspheres are manufactured from a variety of optical glasses to yield the indicated performance. The molding process will cause the properties of the glass (e.g., Abbe number) to deviate slightly from those given by glass manufacturers. Specific material properties for each lens can be found by clicking on the Glass link in the tables below.

Choosing a Lens

Aspheric lenses are commonly chosen to couple incident light with a diameter of 1 - 5 mm into a single mode fiber. A simple example will illustrate the key specifications to consider when trying to choose the correct lens.

Example:
Fiber: P1-630A-FC-2
Collimated Beam Diameter Prior to Lens: Ø3 mm

The specifications for the P1-630A-FC-2, 630 nm, FC/PC single mode patch cable indicate that the mode field diameter (MFD) is 4.3 μm. This specification should be matched to the diffraction-limited spot size given by the following equation:

$Equation for Diffraction-Limited Spot$

Here, f is the focal length of the lens, λ is the wavelength of the input light, and D is the diameter of collimated beam incident on the lens. Solving for the desired focal length of the collimating lens yields

focal length of collimating lens

Thorlabs offers a large selection of mounted and unmounted aspheric lenses to choose from. The aspheric lens with a focal length that is closest to 16 mm has a focal length of 15.29 mm (Item# 354260-B or A260-B). This lens also has a clear aperture that is larger than the collimated beam diameter. Therefore, this aspheric lens is the best option given the initial parameters (i.e., a P1-630A-FC-2 single mode fiber and a collimated beam diameter of 3 mm). Remember, for optimum coupling the spot size of the focused beam must be less than the MFD of the single mode fiber. As a result, if an aspheric lens is not available that provides an exact match, then choose the aspheric lens with a focal length that is shorter than the calculation above yields. Alternatively, if the clear aperture of the aspheric lens is large enough, the beam can be expanded before the aspheric lens, which has the result of reducing the spot size of the focus beam.

Click to Enlarge
Reference Drawing

Definitions of Variables
z	Sag (Surface Profile)
Y	Radial Distance from Optical Axis
R	Radius of Curvature
k	Conic Constant
A₄	4th Order Aspheric Coefficient
A₆	6th Order Aspheric Coefficient
A_n	nth Order Aspheric Coefficient

The target values of these constants are available by clicking on the Info Icons below or by viewing the .pdf and .dxf files available for each lens. Links to the files can be found by clicking on the item number in the price tables below.

Aspheric Lens Design Formula

Positive Radius Indicates that the Center of Curvature is to the Right of the Lens
Negative Radius Indicates that the Center of Curvature is to the Left of the Lens

Aspheric Lens Equation

Choosing a Collimation Lens for Your Laser Diode

Since the output of a laser diode is highly divergent, collimating optics are necessary. Since aspheric lenses do not introduce spherical aberration, they are commonly chosen when the collimated laser beam is to be between one and five millimeters. A simple example will illustrate the key specifications to consider when choosing the correct lens for a given application.

Example:
Laser Diode to be Used: L780P010
Desired Collimated Beam Diameter: Ø3 mm (Major Axis)

The specifications for the L780P010 laser diode indicate that the typical parallel and perpendicular FWHM beam divergences are 10° and 30°, respectively. Therefore, as the light diverges, an elliptical beam will result. To collect as much light as possible during the collimation process, consider the larger of these two divergence angles in any calculations (i.e., in this case use 30°). If you wish to convert your elliptical beam in to a round one, we suggest using an Anamorphic Prism Pair, which magnifies one axis of your beam.

laser diode collimation drawing

Ø = Beam Diameter

Θ = Divergence Angle

From the information above, the focal length of the lens can be determined, using the thin lens approximation:

focal length calculation

With this information known, it is now time to choose the appropriate collimating lens. Thorlabs offers a large selection of aspheric lenses to choose from. For this application the ideal lens is a -B AR-coated molded glass aspheric lens with focal length near 5.6 mm. The C171TMD-B (mounted) or 354171-B (unmounted) aspheric lenses have a focal length of 6.20 mm, which will result in a collimated beam diameter (major axis) of 3.3 mm. Next, check to see if the numerical aperture (NA) of the diode is smaller than the NA of the lens:

0.30 = NA_Lens > NA_Diode ≈ sin(15°) = 0.26

Up to this point, we have been using the FWHM beam diameter to characterize the beam. However, a better practice is to use the 1/e² beam diameter. For a Gaussian beam profile, the 1/e² diameter is almost equal to 1.7X the FWHM diameter. The 1/e² beam diameter therefore captures more of the laser diode's output light (for greater power delivery) and minimizes far-field diffraction (by clipping less of the incident light).

A good rule of thumb is to pick a lens with an NA twice of the NA of the laser diode. For example, either the A390-B or the A390TM-B could be used as these lenses each have an NA of 0.53, which is more than twice the approximate NA of our laser diode (0.26). Note that these lenses each have a focal length of 4.6 mm, resulting in an approximate major beam diameter of 2.5 mm.

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Posted Comments:

Yitzi Calm (posted 2019-07-01 08:13:04.25)

Looking at part # C392TME-C, spec'ed NA = 0.64. If I use: NA = n*a/sqrt(a^2+f^2) where: a = 1.8 mm = CA/2 f = 2.75 mm n = 1 (immersion index) then I get NA = 0.55. I understand the formula I used may not be correct. Actually that's the spirit of my inquiry, I'd like to learn what's the correct formula. Best Regards, Yitzi

nbayconich (posted 2019-07-01 02:11:16.0)

Thank you for contacting Thorlabs, the calculation you provided is useful for thin lenses however cannot be used to accurately determine the NA of an aspheric lens with a high numerical aperture. To get a more accurate value you will have to take the sine of the marginal ray angle. It's easier to see how to calculate this through ray tracing, I will contact you directly to discuss your application.

thha (posted 2019-02-21 04:30:41.003)

Hi... let me know, refletcance value at 650 nm. about ** %

YLohia (posted 2019-02-21 12:10:23.0)

Hello, thank you for contacting Thorlabs. We will reach out with this out-of-range data directly.

hij33153 (posted 2018-07-07 09:07:49.58)

Hey... What is the spot size at focusing place in the A280TM-C?. Is it okay to understand the rms radius is same with the spot size at focusing place??

YLohia (posted 2018-07-09 12:20:26.0)

Hello, the focused spot size depends on the input beam diameter and the wavelength. Please see the spot diameter information we have on this lens here: https://www.thorlabs.com/images/TabImages/A280_Asph.pdf. RMS beam size is just a different way of characterizing a beam size. Alternate ways of characterizing beam size would be 1/e^2, FWHM, etc.

ee14d209 (posted 2018-02-14 22:57:41.733)

Dear Sir, We are using C280TMD-C at 1064 nm, can you please let me know the refractive index and extension coefficient of the material used for C280TMD-C. Thanks,

nbayconich (posted 2018-02-23 09:49:05.0)

Thank you for contacting Thorlabs. The material used in C280TMD-C is D-ZK3 which has a refractive index of 1.574 at 1064nm along with an extinction coefficient of 1.6951 x 10^-8 and coefficient of thermal expansion of 7.6 x 10^-6 / °C. I'll reach out to you directly with more information.

m.barrett (posted 2017-08-10 13:00:40.207)

What is the damage threshold for the A397TM-C? Thanks

tfrisch (posted 2017-08-16 05:53:32.0)

Hello, thank you for contacting Thorlabs. While we don't have any formal damage threshold specs on the molded aspheric lenses, I would expect it to be lower than polished lenses. I will reach out to you directly to discuss the specs of your source.

loic.merceron (posted 2017-04-28 16:28:31.86)

Do you have the damage threshold of those lenses? Thanks

tfrisch (posted 2017-05-16 11:16:42.0)

Hello, thank you for contacting Thorlabs. I will reach out to you directly about your application.

mchen (posted 2015-07-14 10:32:57.98)

Do you have the data of C-coating extended to 2 micron? Thanks!

besembeson (posted 2015-07-23 04:59:13.0)

Response from Bweh at Thorlabs USA: We don't have data extended to 2um. I will followup with you regarding measuring this.

tcohen (posted 2012-04-16 12:49:00.0)

Response from Tim at Thorlabs: The dispersion formula used for these materials is actually the Schott formula. I will contact you with the information including the coefficients and min/max wavelength ranges.

hungwen (posted 2012-04-16 03:59:45.0)

Could you also send me the Sellmeier coefficients of these glasses too? (ex: D-ZK3, ECO-550) Thank you!

bdada (posted 2012-01-09 19:21:00.0)

Response from Buki at Thorlabs: The unmounted lens is 352280-1064 and the drawing is linked below. One surface is flat and the other surface is curved outward. Please refer to the drawing linked below for more information and contact TechSupport@thorlabs.com if you have any questions: http://www.thorlabs.com/Thorcat/19700/19773-E0W.pdf

niels.martinsen (posted 2012-01-01 14:20:56.0)

Hi Is the C280TME-C lens plano convex/concave? In other words, can I regard it as a thin lens? Cheers, Niels.

jjurado (posted 2011-03-22 13:38:00.0)

Response from Javier at Thorlabs to clarafly: Thank you very much for contacting us. I will send you this information shortly.

clarafly (posted 2011-03-22 18:57:18.0)

Can you provide the Sellmeier coefficients of these glasses so that we can simulate the performance of these lenses? Thanks!

AR Coating Abbreviations
Abbreviation	Description
U	Uncoated: Optics do not have an AR Coating of any kind
A	Broadband AR Coating for the 350 - 700 nm or 400 - 600 nm range
B	Broadband AR Coating for the 600 - 1050 nm or 650 - 1050 nm range
C	Broadband AR Coating for the 1050 - 1620 nm or 1050 - 1700 nm range
V	Narrowband AR Coating designed for the wavelength listed in the table below

The table below contains all molded visible and near-IR aspheric lenses offered by Thorlabs. For our selection of IR molded aspheres, click here. The item # listed is that of the unmounted, uncoated lens. An "X" in any of the five AR Coating Columns indicates the lens is available with that coating (note that the V coating availability is indicated with the design wavelength). The table to the right defines each letter and lists the specified AR coating range. Click on the linked X's to purchase the specific lens, which is available mounted and unmounted.

Base Item #	AR Coating Options					Effective Focal Length	NA	Outer Diameter of Unmounted Lens	Working Distance		Entrance Clear Aperture of Unmounted Lens
Base Item #	U	A	B	C	V	Effective Focal Length	NA	Outer Diameter of Unmounted Lens	Unmounted	Mounted^a	Entrance Clear Aperture of Unmounted Lens
354140		X	X	X		1.45 mm	0.58	2.4 mm	0.81 mm	0.81 mm	1.60 mm
354710		X	X	X		1.49 mm	0.53	2.7 mm	0.52 mm^b	0.42 mm^b	1.50 mm
355151		X	X	X		2.00 mm	0.50	3.00 mm	0.48 mm^b	0.28 mm^b	2.00 mm
355390		X	X	X		2.75 mm	0.55	4.50 mm	2.16 mm	1.91 mm	3.60 mm
355392		X	X	X		2.75 mm	0.64	4.00 mm	1.50 mm	0.98 mm	3.60 mm
355440		X	X	X		2.76 mm	0.26/0.52^c	4.7 mm	1.96 mm/7.09 mm^b,c	1.86 mm/7.09 mm^b,c	4.12 mm
355660		X	X	X		2.97 mm	0.60	4.00 mm	1.56 mm	1.31 mm	3.60 mm
354330		X	X	X		3.1 mm	0.68	6.3 mm	1.76 mm	1.76 mm	5.00 mm
A414				X		3.30 mm	0.47	4.50 mm	1.94 mm	1.81 mm	3.52 mm
N414		X	X	X		3.30 mm	0.47	4.50 mm	1.94 mm	1.83 mm	3.52 mm
352610		X	X			4.00 mm	0.60	6.33 mm	2.73 mm	2.44 mm	4.80 mm
352671		X	X		405	4.02 mm	0.60	6.33 mm	2.37 mm	2.13 mm	4.80 mm
354340		X	X			4.03 mm	0.64	6.3 mm	1.48 mm^b	1.18 mm^b	5.10 mm
354350			X	X		4.50 mm	0.43	4.70 mm	2.19 mm	1.59 mm	3.70 mm
352110					1064	6.24 mm	0.40	7.20 mm	3.39 mm	2.42 mm	5.00 mm
355230		X	X	X		4.51 mm	0.55	6.30 mm	2.83 mm^b	2.43 mm^b	5.07 mm
A230	X	X	X	X		4.51 mm	0.55	6.34 mm	2.91 mm	2.53 mm	4.95 mm
A390		X	X			4.60 mm	0.53	6.00 mm	2.70 mm	1.64 mm	4.89 mm
354430			X	X		5.00 mm	0.16	2.00 mm	4.37 mm	3.37 mm	1.60 mm
354171		X	X	X		6.20 mm	0.30	4.70 mm	3.44 mm^b	2.84 mm^b	3.70 mm
352230					1064	4.51 mm	0.55	6.33 mm	2.92 mm	2.67 mm	4.95 mm
355110		X	X	X		6.24 mm	0.40	7.20 mm	2.69 mm^b	1.59 mm^b	5.00 mm
A110	X	X	X	X		6.24 mm	0.40	7.20 mm	3.39 mm	2.39 mm	5.00 mm
A375		X	X	X		7.50 mm	0.30	6.51 mm	5.90 mm	5.59 mm	4.50 mm
352240					1064	8.00 mm	0.50	9.94 mm	5.92 mm	4.93 mm	8.00 mm
354240		X	X	X		8.00 mm	0.50	9.94 mm	5.90 mm	4.80 mm	8.00 mm
A240	X	X	X	X		8.00 mm	0.50	9.94 mm	5.92 mm	4.79 mm	8.00 mm
A397		X	X	X		11.00 mm	0.30	7.20 mm	9.64 mm	8.44 mm	6.59 mm
A220	X	X	X			11.00 mm	0.26	7.20 mm	7.97 mm	6.91 mm	5.50 mm
352220					1064	11.00 mm	0.25	7.22 mm	7.97 mm	6.83 mm	5.50 mm
352240		X	X	X		11.00 mm	0.25	7.2 mm	6.91 mm^b	5.81 mm^b	5.50 mm
354560		X	X	X		13.86 mm	0.18	6.33 mm	12.11 mm	11.74 mm	5.10 mm
354260		X	X	X		15.29 mm	0.16	6.50 mm	12.73 mm^b	12.43 mm^b	5.00 mm
A260		X	X	X		15.29 mm	0.16	6.50 mm	14.09 mm	13.84 mm	5.00 mm
352280					1064	18.40 mm	0.15	6.50 mm	17.13 mm	16.75 mm	5.50 mm
354280		X	X	X		18.40 mm	0.15	6.5 mm	15.86 mm^b	15.56 mm^b	5.50 mm
A280		X	X	X		18.40 mm	0.15	6.50 mm	17.13 mm	16.88 mm	5.50 mm

The mounted working distance is measured from the edge of the unthreaded portion of the housing.
The working distance is measured to the edge of the laser diode window (instead of the emission point).
Image / Object

EFL = 1.xx mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354140-C^c	1.45 mm	0.58	2.4 mm	1.60 mm	0.81 mm	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C140TMD-C^c	1.45 mm	0.58	6.2 mm	1.60 mm	0.81 mm	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M6 x 0.5	SPW306
354710-C^c	1.49 mm	0.53	2.7 mm	1.50 mm	0.52 mm	1550 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C710TMD-C^c	1.49 mm	0.53	6.2 mm	1.50 mm	0.42 mm	1550 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M6 x 0.5	SPW306

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech lenses feature an improved AR coating range of 1050 - 1700 nm.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 2.xx mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^a	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
355151-C^c	2.00 mm	0.50	3.0 mm	2.00 mm	0.48mm^d	780 nm	1050 - 1700 nm	∞	D-ZLaF52LA	Focal Shift Spot Size Cross Section	-	-
C151TMD-C^c	2.00 mm	0.50	6.2 mm	2.00 mm	0.28 mm^d	780 nm	1050 - 1700 nm	∞	D-ZLaF52LA	Focal Shift Spot Size Cross Section	M6 x 0.5	SPW306
355390-C	2.75 mm	0.55	4.50 mm	3.60 mm	2.16 mm	830 nm	1050 - 1620 nm	∞	D-ZLaF52LA	390_Asph.pdf	-	-
C390TME-C	2.75 mm	0.55	8.21 mm	3.60 mm	1.91 mm	830 nm	1050 - 1620 nm	∞	D-ZLaF52LA	390_Asph.pdf	M8 x 0.5	SPW308
355392-C	2.75 mm	0.64	4.0 mm	3.60 mm	1.50 mm	830 nm	1050 - 1620 nm	∞	D-ZLaF52LA	392_Asph.pdf	-	-
C392TME-C	2.75 mm	0.64	6.2 mm	3.60 mm	1.0 mm	830 nm	1050 - 1620 nm	∞	D-ZLaF52LA	392_Asph.pdf	M6 x 0.5	SPW306
355440-C^c	2.76 mm	0.26^e 0.52^f	4.7 mm	4.12 mm	1.96 mm^e 7.09 mm^f	980 nm	1050 - 1700 nm	2	D-ZLaF52LA	Focal Shift Spot Size Cross Section	-	-
C440TMD-C^c	2.76 mm	0.26^e 0.52^f	8.2 mm	3.76 mm^e 4.12 mm^f	1.86 mm^e 7.09 mm^f	980 nm	1050 - 1700 nm	2	D-ZLaF52LA	Focal Shift Spot Size Cross Section	M8 x 0.5	SPW308
355660-C	2.97 mm	0.60	4.00 mm	3.60 mm	1.56 mm	1550 nm	1050 - 1620 nm	∞	D-ZLaF52LA	660_Asph.pdf	-	-
C660TME-C	2.97 mm	0.60	8.20 mm	3.60 mm	1.31 mm	1550 nm	1050 - 1620 nm	∞	D-ZLaF52LA	660_Asph.pdf	M8 x 0.5	SPW308

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the deisgn wavelength.
These Geltech lenses feature an improved AR coating range of 1050 - 1700 nm.
This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point).
Image side.
Object side.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Universal Price Available

355151-C f = 2.00 mm, NA = 0.50, Unmounted Geltech Aspheric Lens, AR: 1050-1700nm

$58.83

Today

C151TMD-C f = 2.00 mm, NA = 0.50, Mounted Geltech Aspheric Lens, AR: 1050-1700nm

$87.47

Today

355390-C f = 2.75 mm, NA = 0.55, Unmounted Geltech Aspheric Lens, AR: 1050-1620nm

$76.44

Today

C390TME-C f = 2.75 mm, NA = 0.55, Mounted Geltech Aspheric Lens, AR-Coated: 1050-1620 nm

$81.69

Today

355392-C Customer Inspired! f = 2.75 mm, NA = 0.64, Unmounted Geltech Aspheric Lens, AR: 1050-1620 nm

$76.44

Today

C392TME-C Customer Inspired! f = 2.75 mm, NA = 0.64, Mounted Geltech Aspheric Lens, AR: 1050-1620 nm

$76.44

Today

355440-C f = 2.76 mm, NA = 0.26/0.52, Unmounted Geltech Aspheric Lens, AR: 1050-1700nm

$55.42

Today

C440TMD-C f = 2.76 mm, NA = 0.26/0.52, Mounted Geltech Aspheric Lens, AR: 1050-1700nm

$73.81

Today

355660-C f = 2.97mm, NA = 0.6, Unmounted Geltech Aspheric Lens, AR: 1050-1620 nm

$90.62

Today

C660TME-C f = 2.97 mm, NA = 0.6, Mounted Geltech Aspheric Lens, AR-Coated: 1050-1620 nm

$96.13

Today

EFL = 3.xx mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354330-C^c	3.1 mm	0.7	6.33 mm	S1: 5.00 mm S2: 3.84 mm	1.8 mm	830 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C330TMD-C^c	3.1 mm	0.7	9.24 mm	S1: 5.00 mm S2: 3.84 mm	1.8 mm	830 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M9 x 0.5	SPW301
A414-C	3.30 mm	0.47	4.50 mm	3.52 mm	1.94 mm	670 nm	1050 - 1620 nm	∞	N-SF57	A414_Asph.pdf	-	-
A414TM-C	3.30 mm	0.47	6.22 mm	3.52 mm	1.81 mm	670 nm	1050 - 1620 nm	∞	N-SF57	A414_Asph.pdf	M6 x 0.5	SPW306
N414-C	3.30 mm	0.47	4.50 mm	3.52 mm	1.94 mm	670 nm	1050 - 1620 nm	∞	H-ZLaF52	N414_Asph.pdf	-	-
N414TM-C	3.30 mm	0.47	6.22 mm	3.52 mm	1.83 mm	670 nm	1050 - 1620 nm	∞	H-ZLaF52	N414_Asph.pdf	M6 x 0.5	SPW306

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech Lenses feature an improved AR coating range of 1050 - 1700 nm.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 4.xx mm

Item # (Unmounted/ Mounted	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354350-C^c	4.50 mm	0.43	4.7 mm	3.70 mm	2.19 mm	980 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C350TMD-C^c	4.50 mm	0.43	8.2 mm	3.70 mm	1.59 mm	980 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M8 x 0.5	SPW308
355230-C^c	4.51 mm	0.55	6.3 mm	5.07 mm	2.83 mm^d	780 nm	1050 - 1700 nm	∞	D-ZLaF52LA	Focal Shift Spot Size Cross Section	-	-
C230TMD-C^c	4.51 mm	0.55	9.2 mm	5.07 mm	2.43 mm^d	780 nm	1050 - 1700 nm	∞	D-ZLaF52LA	Focal Shift Spot Size Cross Section	M9 x 0.5	SPW301
A230-C	4.51 mm	0.55	6.34 mm	4.95 mm	2.91 mm	780 nm	1050 - 1620 nm	∞	S-NPH1	A230_Asph.pdf	-	-

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech Lenses feature an improved AR coating range of 1050 - 1700 nm.
This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point).

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 5.00 mm

Item # (Unmounted/ Mounted)	Info	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354430-C		5.00 mm	0.16	2.00 mm	1.6 / 1.4 mm	4.37 mm	1550 nm	1050 - 1620 nm	∞	D-ZK3	430_Asph.pdf	-	-
C430TME-C		5.00 mm	0.16	6.24 mm	1.6 / 1.4 mm	3.37 mm	1550 nm	1050 - 1620 nm	∞	D-ZK3	430_Asph.pdf	M6 x 0.5	SPW306

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 6.xx mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354171-C^c	6.20 mm	0.30	4.7 mm	3.70 mm	3.44 mm^d	633 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C171TMD-C^c	6.20 mm	0.30	8.2 mm	3.70 mm	2.84 mm^d	633 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M8 x 0.5	SPW308
355110-C^c	6.24 mm	0.40	7.2 mm	5.00 mm	2.69 mm^d	780 nm	1050 - 1700 nm	∞	D-ZLaF52LA	Focal Shift Spot Size Cross Section	-	-
C110TMD-C^c	6.24 mm	0.40	9.2 mm	5.00 mm	1.59 mm^d	780 nm	1050 - 1700 nm	∞	D-ZLaF52LA	Focal Shift Spot Size Cross Section	M9 x 0.5	SPW301
A110-C	6.24 mm	0.40	7.20 mm	5.00 mm	3.39 mm	780 nm	1050 - 1620 nm	∞	H-LaK54	A110_Asph.pdf	-	-
A110TM-C	6.24 mm	0.40	9.24 mm	5.00 mm	2.39 mm	780 nm	1050 - 1620 nm	∞	H-LaK54	A110_Asph.pdf	M9 x 0.5	SPW301

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech Lenses feature an improved AR coating range of 1050 - 1700 nm.
This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point).

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 7.50 mm

Item # (Unmounted/ Mounted)	Info	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
A375-C		7.50 mm	0.30	6.51 mm	4.50 mm	5.90 mm	810 nm	1050 - 1620 nm	∞	H-LaK54	A375_Asph.pdf	-	-
A375TM-C		7.50 mm	0.30	9.24 mm	4.50 mm	5.59 mm	810 nm	1050 - 1620 nm	∞	H-LaK54	A375_Asph.pdf	M9 x 0.5	SPW301

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 8.00 mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354240-C	8.00 mm	0.50	9.94 mm	S1: 8.00 mm S2: 6.94 mm	5.9 mm	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C240TMD-C	8.00 mm	0.50	12.24 mm	S1: 8.00 mm S2: 6.94 mm	4.8 mm	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M12 x 0.5	SPW302
A240-C	8.00 mm	0.50	9.94 mm	8.00 mm	5.92 mm	780 nm	1050 - 1700 nm	∞	D-LaK6	A240_Asph.pdf	-	-
A240TM-C	8.00 mm	0.50	12.24 mm	8.00 mm	4.79 mm	780 nm	1050 - 1700 nm	∞	D-LaK6	A240_Asph.pdf	M12 x 0.5	SPW302

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 11.00 mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
A397-C	11.00 mm	0.30	7.20 mm	6.59 mm	9.64 mm	633 nm	1050 - 1620 nm	∞	H-LaK54	A397_Asph.pdf	-	-
A397TM-C	11.00 mm	0.30	9.24 mm	6.59 mm	8.44 mm	633 nm	1050 - 1620 nm	∞	H-LaK54	A397_Asph.pdf	M9 x 0.5	SPW301
354220-C^c	11.00 mm	0.25	7.2 mm	5.50 mm	6.91 mm^d	633 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C220TMD-C^c	11.00 mm	0.25	9.2 mm	5.50 mm	5.81 mm	633 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M9 x 0.5	SPW301

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech Lenses feature an improved AR coating range of 1050 - 1700 nm.
This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point).

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 13.86 mm

Item # (Unmounted/ Mounted)	Info	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354560-C		13.86 mm	0.18	6.33 nm	5.10 mm	12.11 mm	650 nm	1050 - 1620 nm	∞	D-ZK3	560_Asph.pdf	-	-
C560TME-C		13.86 mm	0.18	9.24 nm	5.10 mm	11.74 mm	650 nm	1050 - 1620 nm	∞	D-ZK3	560_Asph.pdf	M9 x 0.5	SPW301

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 15.29 mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354260-C^c	15.29 mm	0.16	6.5 mm	5.00 mm	12.73 mm^d	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C260TMD-C^c	15.29 mm	0.16	9.2 mm	5.00 mm	12.43 mm^d	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M9 x 0.5	SPW301
A260-C	15.29 mm	0.16	6.50 mm	5.00 mm	14.09 mm	780 nm	1050 - 1620 nm	∞	H-LaK54	A260_Asph.pdf	-	-
A260TM-C	15.29 mm	0.16	9.24 mm	5.00 mm	13.84 mm	780 nm	1050 - 1620 nm	∞	H-LaK54	A260_Asph.pdf	M9 x 0.5	SPW301

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech Lenses feature an improved AR coating range of 1050 - 1700 nm.
This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point).

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

EFL = 18.40 mm

Item # (Unmounted/ Mounted)	EFL^a	NA	OD	CA	WD^b	DW	AR Range	M	Glass	Performance	Thread	Suggested Spanner Wrench
354280-C^c	18.40 mm	0.15	6.5 mm	5.50 mm	15.86 mm^d	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	-	-
C280TMD-C^c	18.40 mm	0.15	9.2 mm	5.50 mm	15.56 mm^d	780 nm	1050 - 1700 nm	∞	D-ZK3	Focal Shift Spot Size Cross Section	M9 x 0.5	SPW301
A280-C	18.40 mm	0.15	6.50 mm	5.50 mm	17.13 mm	780 nm	1050 - 1620 nm	∞	H-LaK54	A280_Asph.pdf	-	-
A280TM-C	18.40 mm	0.15	9.24 mm	5.50 mm	16.75 mm^d	780 nm	1050 - 1620 nm	∞	H-LaK54	A280_Asph.pdf	M9 x 0.5	SPW301

EFL is specified at the design wavelength for the unmounted lens.
WD is specified at the design wavelength.
These Geltech Lenses feature an improved AR coating range of 1050 - 1700 nm.
This working distance is measured from the lens to the window of the laser diode being collimated (not the emission point).

EFL = Effective Focal Length
NA = Numerical Aperture
CA = Clear Aperture

WD = Working Distance
DW = Design Wavelength

OD = Outer Diameter
M = Magnification

View All »Matching Part Numbers

Molded Glass Aspheric Lenses, 1050 - 1620 nm or 1050 - 1700 nm AR Coating

Molded Glass Aspheric Lenses: 1050 - 1620 nm or 1050 - 1700 nm Broadband AR Coating

Choosing a Lens

Aspheric Lens Design Formula

Choosing a Collimation Lens for Your Laser Diode

EFL = 1.xx mm

EFL = 2.xx mm

EFL = 3.xx mm

EFL = 4.xx mm

EFL = 5.00 mm

EFL = 6.xx mm

EFL = 7.50 mm

EFL = 8.00 mm

EFL = 11.00 mm

EFL = 13.86 mm

EFL = 15.29 mm

EFL = 18.40 mm