Specifications
Coating Range	650 - 1050 nm
Design Wavelengths	706.5, 855, 1015 nm
Surface Quality	10-5 Scratch-Dig (to Prevent Scattering from High Power Sources)
Clear Aperture	Ø18 mm
Transmitted Wavefront Error (RMS)	≤0.08λ Over the Clear Aperture^a
Focal Length Tolerance	±1% at 855 nm
Reflectance	R_avg < 0.5% (650-1050 nm)
Housing	Ø1" 6061-T6 Aluminum Barrel

The wavefront error for the ACA254-030-B was calcualted with with a Ø11 mm aperture. See the Lens Comparison tab for plots of wavefront error over the specified wavelength range.

Click to Enlarge
Air-Spaced Achromatic Doublet in an SM1L30C Slotted Lens Tube with Two SM1RR Retaining Rings

Features

Diffraction-Limited Spot Size and Wavefront Error
Air-Spaced Design Provides Superior Aberration Performance vs. Cemented Doublets
Ø18 mm Clear Aperture
1" Outer Diameter for Mounting Inside a Ø1" Lens Tube
AR Coating for the 650 - 1050 nm Range

Thorlabs' Air-Spaced Achromatic Doublets are designed to provide superior spherical and chromatic aberration correction and diffraction-limited performance. Air-Spaced Doublets have two more degrees of freedom than cemented doublets because the interior lens surfaces do not need to have the same curvature. These extra variables allow the performance to far exceed the performance of the cemented doublets in terms of transmitted wavefront error, spot size, and aberrations. For details, please see the Lens Comparison tab. The air-spaced design is also highly resistant to laser damage, since no cement is utilized in the fabrication process. They are designed for excellent performance across the 650 - 1050 nm range.

The doublets are pre-mounted in an aluminum barrel with tight tolerances on lens and barrel diameter to minimize the effects of lens decentering. Each mount includes an engraving with the part number, AR coating wavelength, focal length, and the direction of light propagation required to collimate a point source. The mount has a 1" outer diameter for mounting inside a Ø1" lens tube (as shown in the photo to the right).

Note: We do not recommend disassembly of these lenses, as this may affect performance.

Air-Spaced Doublets Selection Guide
UV (240 - 410 nm)	E (3 - 5 µm)
Visible (350 - 700 nm)	F (8 - 12 µm)
NIR (650 - 1050 nm)	Laser Line (532 & 1064 nm)

Plot Key
Air-Spaced Doublets
Cemented Doublets

The tables below contains links to pop-ups with plots containing a comparison of the theoretical performance of an air-spaced achromatic doublet with the same focal length cemented achromatic doublet. Comparisons are made for focal shift, transmitted wavefront error, and spot radius. The aberration plots show the relative amount of aberration due to each surface, as well as the net aberration induced by the entire lens. These plots generally show the superior performance of our air-spaced doublets for wavefront error, spot size, and spherochromatism.

650 - 1050 nm Lenses

Air-Spaced Item Number^a	Cemented Item Number^a	Focal Shift Plots	Wavefront Error Plots	Spot Radius Plots	Aberration Information^b
ACA254-030-B	AC254-030-B
ACA254-050-B	AC254-050-B
ACA254-060-B	AC254-060-B
ACA254-075-B	AC254-075-B
ACA254-100-B	AC254-100-B
ACA254-150-B	AC254-150-B
ACA254-200-B	AC254-200-B

For the f = 30 mm lenses, the clear aperture was measured with a Ø11 mm aperture. All other lenses were measured over the entire clear aperture.
Aberration data is displayed as colored bars representing the amount of each type of aberration for each surface of the lens. The column furthest to the right in each image is the sum of the aberrations from each surface, and thus represents the total of each type of aberration introduced by the lens.

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Posted Comments:

Poster: jlow

Posted Date: 2012-09-26 13:17:00.0

Response from Jeremy at Thorlabs: These thermally conductive tape are also electrically conductive.

Poster: luolcc

Posted Date: 2012-09-26 12:10:59.0

Is it okay to apply on conductor? i.e. is the tape insulating on the surface?

Poster: Thorlabs

Posted Date: 2010-11-29 09:34:47.0

Response from Javier at Thorlabs to tmpest1: the operating temperature range of the TCDT1 and TCDT2 double-sided tape is -30 to 125 degrees Celsius.

Poster: tmpest1

Posted Date: 2010-11-29 01:30:07.0

Tyler@Thorlabs "Unfortunately we dont know the working temperature range of this thermal tape" Do you have temperature ratings for this double-sided tape since that was written 2 years ago? I just require "normal" temperatures 0-130C.

Poster: Tyler

Posted Date: 2008-11-05 16:09:05.0

A response from Tyler at Thorlabs to denisel: Unfortunately we dont know the working temperature range of this thermal tape. However, we will send you a sample to test in your setup. If you dont mind, please post your findings about how this thermal tape performed in your cryostat.

Poster: denisel

Posted Date: 2008-11-04 02:47:50.0

Would like to find out ratings of this tape at low temperatures? Does it still maintain holding and thermal conductivity say at 77K?

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NIR Air-Spaced Achromatic Doublets, AR Coated: 650 - 1050 nm

Features

650 - 1050 nm Lenses