Name: 25mm Dia x 20mm FL 3-12μm Coated, Ge Aspheric Lens
Brand: TECHSPEC
SKU: 89-609
Price: ₹67,575.00

25mm Dia x 20mm FL 3-12μm Coated, Ge Aspheric Lens

Stock #89-609 10 to 12 days Other Coating Options

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₹67,575.00

Qty 1-5
₹67,575.00

Qty 6+
₹57,438.75

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Diameter (mm):

25.00 +0.0/-0.1

Effective Focal Length EFL (mm):

20.00 @ 4000nm

Numerical Aperture NA:

0.63

Back Focal Length BFL (mm):

19.08

Germanium (Ge)

Aspheric Design Wavelength (nm):

4000

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Coating:

BBAR (3000-12000nm)

Coating Specification:

R_avg <5.0% @ 3 - 12μm

Centering (arcmin):

≤5

Surface Quality:

60-40

Clear Aperture CA (mm):

22.5

Edge Thickness ET (mm):

2.5

Center Thickness CT (mm):

3.70 ±0.10

f/#:

0.79

Bevel:

Protective bevel as needed

Edges:

Diamond Turned

Shape of Back Surface:

Plano

Type:

Aspheric Lens

Wavelength Range (nm):

3000 - 12000

Conjugate Distance:

Infinite

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

Reach 235:

Compliant

Product Family Description

Diffraction Limited Performance
Variety of Coating Options
Full Prescription Data Available
Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.

Our TECHSPEC® Germanium Infrared (IR) Aspheric Lenses provide diffraction limited focusing performance over a broad spectral range in the Mid- and Long Wave infrared regions. Ideal for monochromatic light sources, such as quantum cascade lasers, these lenses offer a high performance alternative to standard plano-convex lenses.

Each aspheric lens is available uncoated, or with BBAR coating options. Uncoated germanium has transmission of <50%, so custom anti-reflection (AR) coatings should be considered if specifying an uncoated lens. Each BBAR coated lens offers >95% transmission, making it ideal for integration into a variety of OEM applications. For custom design or coating options, please contact our Sales Department.

Technical Information

AR COATED GERMANIUM
	Typical transmission of a 3mm thick Ge window with BBAR (3000-5000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <3% @ 3000 - 5000nm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data
	Typical transmission of a 3mm thick Ge window with BBAR (3000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <5.0% @ 3 - 12μm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data
	Typical transmission of a 3mm thick Ge window with BBAR (8000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <3.0% @ 8 - 12μm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data