Name: 25mm Dia x 20mm FL 3-5μm Coated, Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-245
Price: ₹86,478

25mm Dia x 20mm FL 3-5μm Coated, Ge Aspheric Lens

Stock #68-245 10 to 12 days Other Coating Options

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₹86,478

Qty 1-5
₹86,478

Qty 6+
₹69,182

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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 (3000-5000nm)

Coating Specification:

R_avg <3.0% @ 3 - 5μm

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 - 5000

Conjugate Distance:

Infinite

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

REACH 241:

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.

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.
The lenses are available in a 12.5, 25, or 50mm diameter. TECHSPEC® Germanium Infrared (IR) Aspheric Lenses are 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