Name: 25mm Dia x 20mm FL 8-12μm Coated, Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-253
Price: S$1,192.50

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

Coating:

BBAR (8000-12000nm)

Coating Specification:

R_avg <3.0% @ 8 - 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

Wavelength Range (nm):

8000 - 12000

Conjugate Distance:

Infinite

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

Reach 233:

Compliant

Product Family Description

Diffraction Limited Performance
Variety of Coating Options
Full Prescription Data Available

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.

Title	Type	Stock Number	Price	Buy
25/25.4mm Diameter, T-Mount Thin Optic Mount	Fixed	#52-292	S$89.70 Qty 5+ S$79.65 Request Quote	3-5 days ×
25/25.4mm Diameter, C-Mount Thin Optic Mount	Fixed	#56-353	S$133.65 Qty 5+ S$118.50 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., X-Y Translating Optic Mount	Adjustable - Linear (XY)	#62-956	S$379.50 Qty 5+ S$360.60 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., X-Y-Z Translating Optic Mount	Adjustable - Linear (XYZ)	#62-959	S$744.00 Qty 5+ S$669.60 Request Quote	3-5 days ×
25.0mm Optic Dia., Optic Mount	Fixed	#64-560	S$66.00 Qty 10+ S$59.40 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., L-Slot Direct Mount	Fixed	#36-410	S$94.50 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., L-Slot and Rotation Direct Mount	Adjustable - Rotary	#36-411	S$136.50 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., Side Flange Direct Mount	Fixed	#36-414	S$94.50 Request Quote	3-5 days ×
25mm Thin Inner Pair Optic Mounts	Fixed	#11-052	S$91.50 Qty 5+ S$85.50 Request Quote	3-5 days ×
25mm Thick Inner Pair Optic Mounts	Fixed	#11-054	S$91.50 Qty 5+ S$85.50 Request Quote	3-5 days ×
25mm Thin Inner Single Optic Mount	Fixed	#38-755	S$46.50 Qty 5+ S$44.70 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, M4	Fixed	#13-787	S$28.50 Qty 5+ S$27.15 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, 8-32	Fixed	#13-788	S$28.50 Qty 5+ S$27.15 Request Quote	3-5 days ×
25.0/25.4mm Optic Dia., 5 Axes Optical Mount	Adjustable - Linear (XYZ) & Tip-Tilt	#13-776	S$1,036.50 Qty 5+ S$984.90 Request Quote	3-5 days ×