Name: 25mm Dia x 25mm FL Uncoated, Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-238
Price: €550,05

25mm Dia x 25mm FL Uncoated, Ge Aspheric Lens

Diameter (mm):

25.00 +0.0/-0.1

Effective Focal Length EFL (mm):

25.00 @ 4000nm

Numerical Aperture NA:

0.50

Back Focal Length BFL (mm):

22.51

Center Thickness CT (mm):

3.45 ±0.10

Coating:

Uncoated

Germanium (Ge)

Clear Aperture CA (mm):

22.5

Asphere Figure Error (μm RMS):

0.1

Surface Quality:

60-40

Edge Thickness ET (mm):

2.32

Centering (arcmin):

≤5

Bevel:

Protective bevel as needed

f/#:

1.00

Edges:

Diamond Turned

Radius R₂ (mm):

37.8

Shape of Back Surface:

Concave

Wavelength Range (nm):

2000 - 14000

Conjugate Distance:

Infinite

Focal Length Specification Wavelength (nm):

4000

Regulatory Compliance

RoHS:

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.