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25.4mm Dia x 125mm FL, Germanium Meniscus Lens

Stock #63-296 Clearance
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£212.46
Qty 1
£212.46
Volume Pricing
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Center Thickness CT (mm):
2.90
Center Thickness Tolerance (mm):
±0.2
Centering (arcmin):
<3
Clear Aperture (%):
90.00
Coating:
Uncoated
Diameter (mm):
25.40 +0.00/-0.13
Edge Thickness ET (mm):
2.70
Effective Focal Length EFL (mm):
125.00
Effective Focal Length EFL @ 10.6μm (mm):
127.00
Effective Focal Length EFL @ 12μm (mm):
128.20
Effective Focal Length EFL @ 2.94μm (mm):
126.30
Effective Focal Length EFL @ 5.0μm (mm):
127.60
f/#:
4.92
Focal Length Specification Wavelength (μm):
10.6
Focal Length Tolerance (%):
±2 @ DWL
Numerical Aperture NA:
0.10
Radius R1 (mm):
187.07
Radius R2 (mm):
127.35
Substrate:
Germanium (Ge)
Surface Accuracy:
λ/20
Surface Quality:
60-40
Type:
Meniscus Lens
Wavelength Range (μm):
2 - 14
Wavelength Range (nm):
2000 - 14000

Regulatory Compliance

RoHS:

Product Family Description

  • High Index of Refraction
  • Minimal Chromatic Aberration Due to Low Dispersion
  • Available in Plano-Convex (PCX) or Meniscus Designs

Germanium (Ge) Lenses are ideal for use in Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) applications, including thermal imaging, spectroscopy, or FLIR. Additionally, Germanium’s Knoop Hardness of 780 is well suited for rugged environments. Due to thermal runaway, or the decrease in transmission as temperature increases, Germanium (Ge) Lenses should be used at temperatures below 100°C. Germanium’s high density (5.33 g/cm3) should be considered when designing for weight-sensitive systems.

Meniscus lenses are convex-concave lenses. They have one outward curved face and one inward-curved face. If the outward curve is sharper than the inward curve, the lens has a positive focal length and acts as a magnifier.

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