LWIR Achromatic Doublets Optimized for 7 - 12 µm
- AR Coating for 7 - 12 µm
- Design Wavelengths at 8 µm, 10 µm, and 12 µm
- 1" Outer Diameter Aluminum Housing
f = 50 mm
f = 200 mm
Each mount includes an engraved arrow
indicating the direction of light propagation
required to collimate a point source.
|Ravg < 1.0%, Rabs < 2.0%
from 7 to 12 µm, 0° AOI
|Transmissiona||Tavg > 97.0%, Tabs > 92.0%
from 7 to 12 µm, 0° AOI
|Design Wavelengths||8 µm, 10 µm, and 12 µm|
|Diameter||Ø1" (Ø25.4 mm)|
|Clear Aperture||Ø20.0 mm|
|Spot Size||Diffraction Limited On Axis|
|Substrates||Zinc Selenideb and Zinc Sulfide|
|Focal Length Tolerance||±1% at 10.6 µm|
|RMS WFE||<λ/10 @ 10.6 µm|
|Surface Quality||60-40 Scratch-Dig|
- Air-Spaced Doublet Design Provides Superior Aberration Performance Compared to Singlet Lenses
- AR Coated for the 7 - 12 µm Range
- Designs Incorporate Zinc Selenide (ZnSe) and Zinc Sulfide (ZnS) Substrates
- Engraved Ø1" Mount for SM1 Compatibility
These AR-coated, air-spaced achromatic doublet lenses provide excellent transmission in the 7 - 12 µm range (surface reflectance for each coating can be seen in the graph to the right). They incorporate two AR-coated lenses, one with a zinc selenide substrate and another with a zinc sulfide substrate. Each achromatic doublet on this page has three design wavelengths: 8 µm, 10 µm, and 12 µm. By optimizing the design for these three wavelengths, the focal shift across the 7 - 12 µm range will be minimized (see the graphs below for details), providing excellent on-axis performance.
Thorlabs' LWIR achromatic doublets are pre-mounted in engraved Ø1" outer diameter mounts, making it easy to incorporate these optics into your setup. Each engraving includes the part number, AR coating range, focal length, an arrow indicating the direction of light propagation to collimate a point source, and an infinity symbol denoting that this lens has an infinite conjugate ratio (i.e., if a diverging light source is placed one focal length away from the flat side of the lens, the light rays emerging from the curved side will be collimated).
Note: We do not recommend disassembly of these lenses, as this may affect performance.
|Air-Spaced Doublets Selection Guide|
|UV (245 - 400 nm)||D (1.65 - 3 µm)|
|Visible (350 - 700 nm)||E (3 - 5 µm)|
|NIR (650 - 1050 nm)||E3 (7 - 12 µm)|
|Laser-Line (532 & 1064 nm)|
|Click on the red Document icon next to the item numbers below to access the Zemax file download.|
Marina Servol  (posted 2022-10-03 08:41:32.437)
Hello, I have seen your achromatic doublets optimized for 3 - 5 µm and 8 -12 µm. I would like to know if you have a solution for the range 5 - 8 µm. Thanks for your answer. Sincerely, Marina
jdelia  (posted 2022-10-03 02:55:39.0)
Thank you for contacting Thorlabs. Unfortunately, we do not offer any achromatic doublets optimized for this wavelength range. We apologize for the inconvenience. I could certainly pass along your feedback to our engineering team through our internal suggestion forum.
Junyu Li  (posted 2022-01-20 05:58:00.28)
We would like to know the transmission spectrum of the AR coating above 12.5um and below 7.5um
jgreschler  (posted 2022-01-24 04:03:19.0)
Thank you for reaching out to Thorlabs. Additional data can be requested by contacting our Tech Support team at email@example.com. I have reached out to you directly to provide the requested data.
bdada  (posted 2011-12-20 17:37:00.0)
Response from Buki at Thorlabs: We expect the air spaced doublets to handle up to a linear power density of 35kW/cm. Please contact TechSupport@thorlabs.com if you have any questions.
manuel.uphoff  (posted 2011-12-12 06:26:00.0)
What is the damage threshold of these lenses for a cw CO2-Laser?
jjurado  (posted 2011-08-01 09:24:00.0)
Response from Javier at Thorlabs to nick: Thank you for contacting us. We will send you this information shortly.
nick  (posted 2011-07-25 08:35:22.0)
Can you please provide me with the optical prescription of this lens (radius, aspheric / conic terms, thickness, seperation distance)? Thank you in advance! Nick