NIR Air-Spaced Achromatic Doublets, AR Coated: 650 - 1050 nm
|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|
Wavefront Error (RMS)
Over the Clear Aperturea
|Focal Length Tolerance||±1% at 855 nm|
|Reflectance||Ravg < 0.5% (650-1050 nm)|
|Housing|| Ø1" 6061-T6 Aluminum Barrel|
- 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.