Name: 25mm Dia x 75mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-266
Price: S$1,162.50

Diameter (mm):

25.00 +0.0/-0.1

Effective Focal Length EFL (mm):

75.00 @ 4000nm

Numerical Aperture NA:

0.17

Back Focal Length BFL (mm):

72.79

Germanium (Ge)

Aspheric Design Wavelength (nm):

4000

Coating:

BBAR (3000-5000nm)

Coating Specification:

R_avg <3.0% @ 3 - 5μm

Surface Accuracy, P-V (μm):

0.3

Centering (arcmin):

≤5

Surface Quality:

60-40

Clear Aperture CA (mm):

24.0

Edge Thickness ET (mm):

2.39

Center Thickness CT (mm):

2.80 ±0.10

f/#:

2.94

Bevel:

Protective bevel as needed

Edges:

Diamond Turned

Radius R₂ (mm):

100.8

Shape of Back Surface:

Concave

Wavelength Range (nm):

3000 - 5000

Conjugate Distance:

Infinite

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Regulatory Compliance

RoHS:

Compliant

Certificate of Conformance:

View

Product Family Description

Color Corrected for 3 – 5μm
Near Diffraction Limited Focusing Performance
Full Prescription Data Available

Our TECHSPEC® Germanium Infrared (IR) Hybrid Aspheric Lenses provide diffraction limited focusing performance at any wavelength in the 3 – 5μm region, and near diffraction limited performance when used over the entire 3 -5μm spectral range. They are ideal for integration into imaging applications, FTIR spectrometers, or any Mid-Wave IR application utilizing a broad band light source.

Each hybrid aspheric lens is coated for >95% transmission for the most efficient use of costly infrared illumination. However, transmission is limited by the inherent diffraction efficiency of the aspheric surface, yielding lower overall transmission at the extremes of the design spectral band. For custom design or coating options, please contact our Sales Department.

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