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25.4mm Diameter x 63.5mm FL, CaF2 Double-Convex Lens

Diameter (mm):
25.40 +0.00/-0.13
Effective Focal Length EFL (mm):
63.50
Coating:
Uncoated
Substrate:
Calcium Fluoride (CaF2)
Surface Quality:
60-40
Clear Aperture (%):
90.00
Centering (arcmin):
<3
Bevel:
Protective bevel as needed
Center Thickness CT (mm):
5.30
Center Thickness Tolerance (mm):
±0.2
Edge Thickness ET (mm):
2.00
Radius R1=-R2 (mm):
49.89
Back Focal Length BFL (mm) @ DWL:
61.56
Effective Focal Length EFL @ 0.6328μm (mm):
58.57
Effective Focal Length EFL @ 1.064μm (mm):
59.16
Effective Focal Length EFL @ 2.94μm (mm):
60.59
Effective Focal Length EFL @ 5.0μm (mm):
63.50
f/#:
2.5
Focal Length Specification Wavelength (μm):
5.00
Focal Length Tolerance (%):
±2 @ DWL
Numerical Aperture NA:
0.20
Surface Accuracy:
Type:
Double-Convex Lens
Wavelength Range (μm):
0.35 - 7
Wavelength Range (nm):
350 - 7000

Product Family Description

  • Greater than 90% Transmission from 350nm-7μm
  • Low Index of Refraction

Calcium Fluoride is often used in spectroscopic windows and lenses due to its high transmission from 350nm to 7μm. Calcium Fluoride is also commonly found in cryogenically cooled thermal imaging systems. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium Fluoride's low refractive index allows it to be used without an antireflective coating. The Knoop hardness of Calcium Fluoride is 158.3.

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