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Superceded

Features

  • High NA (0.15 To 0.68)
  • Powerful Single Element Replacement for Multi-Element Microscope Objectives
  • Collimate or Focus Light with a Single Element
  • Diffraction-Limited Performance
  • Surface Quality: 40-20 Scratch-Dig (Includes Entire Bulk Material)
  • AR-Coated and Uncoated Optics Shipped from Stock
  • Mounted in Stainless Steel Lens Cells
  • Available Unmounted

Aspheric Lens Coefficients

The aspheric lens coefficients are listed on the product page that is loaded by clicking on the part number in the price table below or in the .pdf and .dxf files available for each lens. Links to the files can be found under the Drawings and Documents tab or by clicking on the part number in the price table below.

In laser diode systems, difficulties with spherical aberration correction are compounded by the beam’s high divergence angle. Since individual spherical lenses can refract light at only small angles before spherical aberration is introduced, three or four elements are often required to collimate laser diode light. In contrast, a single aspheric lens collimates without introducing spherical aberration.

When coupling light into fiber, it is often necessary to focus the laser light to a diffraction-limited spot. Typically, single spherical elements are not capable of achieving such a small spot size; spherical aberration is the limiting factor rather than the diffraction limit. In contrast, the aspheric lenses are corrected to eliminate the spherical aberration, and therefore, only diffraction limits the size of the focal spot.

Thorlabs mounts molded glass aspheres into stainless steel lens cells that are engraved with the part number for easy identification. These mounted aspheres have a typical metric thread that effortlessly integrates into your setup or OEM application. The mounted aspheres are readily adapted to our SM1 series of lens tubes by using ourAspheric Lens Adapters.

Mounted aspheres can replace a multi-element microscope objective by combining the lens with our Microscope Objective Adapter Extension Tube.

The damage threshold for these lenses is determined by the antireflective (AR) coating. As a guideline these coatings can withstand 100 W/cm2 CW input power or 0.1 J/cm2 with 10 ns pulses energy at 1064 nm.

Theoretical AR Coating Curve Performance*

Asphere AR Coatings 2b
Click on graph to download theoretical coating data.
*The CxxxTME-A aspheric lenses have a different AR coating than the one plotted above. It is effective from 400 - 600 nm.

LightPath Technologies Mounted Aspheric Lenses (-A, -B, or -C Coating)

Item#efl*NAClear ApertureLens Working
Distance*
Housing
Diameter
Thread on
Housing
Design
Wavelength
Window
Thickness**
C140TME1.45 mm0.551.60 mm0.88 mm6.2 mmM6-0.5780 nmNone
C710TME1.49 mm0.501.50 mm1.10 mm6.2 mmM6-0.51550 nm0.25 mm
C150TME2.00 mm0.502.00 mm1.09 mm6.2 mmM6-0.5780 nm0.25 mm
C390TME2.75 mm0.553.60 mm2.16 mm8.2 mmM8-0.5830 nmNone
C440TME2.95 mm0.27 (image)
0.53 (object)
4.20 mm (image)
4.00 mm (object)
2.66 mm (image)
6.91 mm (object)
8.2 mmM8-0.5980 nm0.25 mm
C660TME2.97 mm0.603.60 mm1.56 mm8.2 mmM8-0.51550 nmNone
C330TME3.10 mm0.685.00 mm1.76 mm9.2 mmM9-0.5830 nmNone
C610TME4.00 mm0.604.80 mm2.73 mm9.2 mmM9-0.5410 nm1.20 mm
C671TME4.02 mm0.604.80 mm2.37 mm9.2M9-0.5408 nm0.25 mm
C340TME4.03 mm0.625.00 mm2.69 mm9.2 mmM9-0.5685 nm1.20 mm
C350TME4.50 mm0.423.70 mm2.38 mm8.2 mmM8-0.5980 nmNone
C230TME4.51 mm0.554.95 mm2.92 mm9.2 mmM9-0.5780 nm0.25 mm
C430TME5.00 mm0.151.60 mm4.37 mm6.2 mmM6-0.51550 nmNone
C170TME6.16 mm0.303.70 mm4.38 mm8.2 mmM8-0.5780 nm0.27 mm
C110TME6.24 mm0.405.00 mm3.39 mm9.2 mmM9-0.5780 nm0.27 mm
C240TME8.00 mm0.508.00 mm5.92 mm12.2 mmM12-0.5780 nm0.25 mm
C220TME11.00 mm0.255.50 mm7.97 mm9.2 mmM9-0.5633 nm0.25 mm
C560TME13.86 mm0.185.10 mm12.11 mm9.2 mmM9-0.5650 nmNone
C260TME15.29 mm0.165.00 mm14.00 mm9.2 mmM9-0.5780 nm0.25 mm
C280TME18.40 mm0.155.50 mm17.13 mm9.2 mmM9-0.5780 nm0.25 mm
*These values are specified at the design wavelength of the lens.
**The aspheric lens design is optimized for use with a window between the source and the lens.

LightPath Technologies Unmounted Aspheric Lenses (-405 Coating)

Item#efl*NAClear
Aperture
Lens Working
Distance*
Housing
Diameter
Thread on
Housing
Design
Wavelength
Window
Thickness**
C671TME-4054.01 mm0.604.80 mm2.36 mm9.2 mmM9-0.5408 nm0.25 mm
*These values are given for 405 nm
**The aspheric lens design is optimized for use with a window between the source and the lens.

LightPath Technologies Unmounted Aspheric Lenses (-1064 Coating)

Item#efl*NAClear
Aperture
Lens Working
Distance*
Housing
Diameter
Thread on
Housing
Design
Wavelength
Window
Thickness**
C230TME-10644.55 mm0.554.95 mm2.96 mm9.2 mmM9-0.5780 nm0.25 mm
C110TME-10646.29 mm0.405.00 mm3.44 mm9.2 mmM9-0.5780 nm0.27 mm
C240TME-10648.07 mm0.508.00 mm5.99 mm12.2 mmM12-0.5780 nm0.25 mm
C220TME-106411.21 mm0.255.50 mm8.18 mm9.2 mmM9-0.5633 nm0.25 mm
C280TME-106418.57 mm0.155.50 mm17.30 mm9.2 mmM9-0.5780 nm0.25 mm
*These values are given for 1064 nm
**The aspheric lens design is optimized for use with a window between the source and the lens.

Rochester Precision Optics Mounted Aspheric Lenses

Item#efl*NAClear
Aperture
Lens Working
Distance*
Housing
Diameter
Thread on
Housing
Design
Wavelength
Window
Thickness**
A414TM3.30 mm0.473.52 mm1.94 mm6.2 mmM6-0.5670 nm0.25 mm
A230TM4.51 mm0.544.95 mm2.91 mm9.2 mmM9-0.5780 nm0.25 mm
A390TM4.60 mm0.534.89 mm2.70 mm9.2 mmM9-0.5655 nm0.275 mm
A110TM6.24 mm0.425.00 mm3.39 mm9.2 mmM9-0.5780 nm0.275 mm
A375TM7.50 mm0.304.50 mm5.90 mm9.2 mmM9-0.5810 nm0.275 mm
A240TM8.00 mm0.508.00 mm5.92 mm12.2 mmM12-0.5780 nm0.25 mm
A220TM11.00 mm0.265.50 mm7.97 mm9.2 mmM9-0.5633 nm0.25 mm
A397TM11.00 mm0.306.59 mm9.64 mm9.2 mmM9-0.5670 nm0.275 mm
* These values are specified at the design wavelength of the lens.
**The aspheric lens design is optimized for use with a window between the source and the lens.

The aspheric lens coefficients are listed on the product page that is loaded by clicking on the part number in the price table below or in the .pdf and .dxf files available for each lens. Links to the files can be found under the Drawings and Documents tab or by clicking on the part number in the price table below.

LightPath Geltechs

The 352xxx Series of Lenses
New European (RoHS) and Japanese environmental regulations have restricted the use of lead and other hazardous substances in optical components. ECO550 is an environmentally friendly alternative to conventional moldable glasses. It has similar optical properties to CO550, but does not contain any hazardous materials.

The aspheric lens coefficients are listed on the product page that is loaded by clicking on the part number in the price table below or in the .pdf and .dxf files available for each lens. Links to the files can be found under the Drawings and Documents tab or by clicking on the part number in the price table below.

Refractive Index Chart

Wavelength (nm) ECO-550
404.7 1.62636
435.8 1.62068
480.0 1.61464
486.1 1.61394
546.1 1.60837
587.6 1.60550
632.8 1.60300
643.8 1.60246
656.3 1.60189
706.5 1.59987
852.1 1.59573
1014.0 1.59270
1300.0 1.58898
1550.0 1.58625
 
Abbe Number (Vd) 50.27
CTE (10-6/ºC) 13.1
dn/dT (10-6/ºC) 3.39
Aspheric Transmission 1Aspheric Transmission 2
1 mm Thick Samples1 mm Thick Samples

Lens Design Formula

  • Positive Radius Indicates that the Vertex is Located Left of the Center
  • Negative Radius Indicates that the Vertex is Located Right of the Center

1

Variable Definitions
zSAG as a Function of Y
RRadius of Curvature
kConic Constant
A44th Order Aspheric Coefficient
A66th Order Aspheric Coefficient
A8 8th Order Aspheric Coefficient
A1010th Order Aspheric Coefficient
A12 12th Order Aspheric Coefficient
 

Aspheric Lens Coefficients

The aspheric lens coefficients are listed on the product page that is loaded by clicking on the part number in the price table below or in the .pdf and .dxf files available for each lens. Links to the files can be found under the Drawings and Documents tab or by clicking on the part number in the price table below.

Choosing a Fiber Collimation 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 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 the 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. Scanning through the list of options under the Selection Guide Tab, you'll note that the aspheric lens with ta focal length that is closest to 16 mm has a focal length of 15.29 mm (Item# C260TME-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.

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Posted Comments:
Poster: apalmentieri
Posted Date: 2009-11-20 21:43:50.0
A response from Adam at Thorlabs: I will pass your comments on to our tech marketing department to see if we can improve the webpage to include these points. If you still have the boxes that the lenses came in, you should be able to find the lot number(it should begin with a P or W and is followed by 5-6 numbers). Using this number we can look up the individual coating for that lens and we can provide the transmission data in an excel spreadsheet. I will email you to try and provide more information. You also mention recieving data for the coating reflectance outside of the designated range. This is rather difficult as the -B coating is only optomized between 650-1050nm. Outside of this range, the %R values become inconsistent and change with each coating run. For instance, one run you can see optimal %R at 1550, between .5 and 1%, and another run may yield 5% reflectance/surface at 1550nm. This is the reason we generally do not provide extended transmission information for our coatings.
Poster: h.ruetz
Posted Date: 2009-11-20 11:35:58.0
Im currently using several Lenses with -B and -C-coating. In order to make the right choice which lens to use and also to be able to better interpret measurements, I would really appreciate if you could give me more detailed information about the coatings: 1. more accurate data within the transmission range (perhaps a list of points instead of a 2mm-thick line in a tiny image) 2. also provide the coating behaviour outside the high transmission range (e.g. transmission of the -B-coating around 1550 nm) Thanks in advance
Poster: klee
Posted Date: 2009-06-23 15:39:22.0
Response from Ken at Thorlabs to rpfitzg: Please note that the transmission of ECO550 starts to drop off after 1700 nm. At 2000 nm, the transmission is only ~85%.
Poster: klee
Posted Date: 2009-06-22 14:33:54.0
Response from Ken at Thorlabs to rpfitzg: These lenses can be purchased without AR coating or with custom AR coating. Please send your exact requirements to techsupport@thorlabs.com and we can send you a quotation.
Poster: rpfitzg
Posted Date: 2009-06-22 13:25:48.0
Can these aspheric lenses be purchased without the AR coating? Alternatively, can the lens be purchased with an AR coating for a different wavelength range, e.g. near 2300nm?
Poster: jens
Posted Date: 2009-05-07 18:18:17.0
A response from Jens at Thorlabs: Luis, thanks for pointing this out. We currently have guidelines for the damage threshold of the AR coating used which are 100W/cm2 CW and 0.1J/cm2, 10nsec, 1064nm pulse. As I mentioned these are guidelines. In addition we are running a series of tests at the moment to create enough data so that we can add values to the spec tables. I will contact the engineer in our optics department and make sure we either add the guidelines or if measurements have been finished already the final spec values.
Poster: luis.dussan
Posted Date: 2009-05-07 17:53:28.0
What is the damage threshold on the coatings? Its not on here
Poster: Greg
Posted Date: 2009-03-12 07:19:56.0
A response from Greg at Thorlabs: Thank you for your feedback. We are working on a new format for this webpage to make it easier to use. The new webpage will remove the sortable table, which will eliminate the issue of multiple entries for the same wavelength range.
Poster:
Posted Date: 2009-03-03 09:30:09.0
The filter for the wavelength range includes up to three different entries for the same range. Can that be fixed?
Poster: Tyler
Posted Date: 2009-01-15 08:13:01.0
A response from Tyler at Thorlabs to melsscal: The aspheric coefficients for all of our aspheric lenses can be found on our website via two paths. The first is to go to our "Drawings and Documents" tab and open up the .pdf or .dxf support drawings for the lens of interest. The second is to click on the part number you are interested in, which will load a .pdf page that contains the product, its specs, and the aspheric coefficients. Thank you for your inquiry and if we can provide any additional information please ask.
Poster: melsscal
Posted Date: 2009-01-15 06:30:06.0
Aspheric Lens Coefficient for C440TME-B not found on your website .can u please emailsame.tome a.k.bose/melss india
Poster: Tyler
Posted Date: 2008-06-06 10:20:01.0
A response from Tyler at Thorlabs to emb64: Your problem could be the result of the lens being oriented backwards. Make sure the threaded side of the lens mount is closest to the fiber tip. If this isnt the problem, please repost or contact an application engineer to discus other possibilities.
Poster: emb64
Posted Date: 2008-06-06 07:36:49.0
We are using lens C280TME-B to collimate a gaussian beam exiting a fiber and instead of having a diffraction-limited beam we obtain a beam with spherical aberration. Any clues?
Poster: hirawake
Posted Date: 2008-01-31 06:48:41.0
Would you mind giving me ZEMAX data of C330TM-B or 350330? Im really confused. Please send me above the data. Regard.
Poster: acable
Posted Date: 2007-09-15 08:47:13.0
Can this pdf be brought back to life (also add Abbe number). Thorlabs has refractive index data at specific wavelengths from 365 to 1550 nm: on p. 2 of this pdf file: http://www.thorlabs.com/Images/PDF/261.pdf
Poster: acable
Posted Date: 2007-09-15 08:41:38.0
Thanks for the changes... It would also be nice to have transmission curves for the uncoated glass types that are used in these optics, having a copy of the Gaussian beam profile under the "Graphs" tab seems out of place and not at all what i was expecting to find.
Poster: technicalmarketing
Posted Date: 2007-09-14 18:09:51.0
We removed the page breaks from the table but kept the filter and sort functionality. The NA of the lenses was added to the table. The item numbers are now clickable and lead to individual product page which makes the drawings and documents for each lens easier accessable.
Poster: acable
Posted Date: 2007-09-13 19:22:44.0
Need to also show the NA, this is probably the second most important piece of data (f, NA, then Dia.). I would also prefer one long page even if it meant giving up the sortable table, as long as the price table is ordered by focal length, then NA, then Dia.
Poster: technicalmarketing
Posted Date: 2007-08-16 10:54:58.0
This page now features a price table that can be sorted. This should help locate the desired lens quickly. The aspheric coefficients will be added to the page in the next couple of months. They are currently available in the volume 19 catalog and through technical support. Thank you for the suggestions.
Poster: acable
Posted Date: 2007-08-15 00:19:17.0
Yes the coefficients would be nice. Also please consider sorting the price box by focal length and then NA as a secondary sort. Now the parts are in some random order that doesn't help me find what i need. Another thing, please consider making the part numbers on the "Selection Guide" clickable and then have viewer repositioned at the corresponding location in the price box.
Poster: cjohns
Posted Date: 2007-07-27 13:06:08.0
If we are going to show the Lens Equation Formula, we should add Asphere coefficients to the FAQ under each lens.
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