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Calcium fluoride(CaF2) Window

Calcium fluoride(CaF2) Window

  Calcium fluoride(CaF2) optical window


 Single crystal of Calcium fluoride(CaF2)
 Polycrystalline of  Calcium fluoride(CaF2)
 Purity: >99.99%

Other Names

Calcium fluoride window, CaF2 window, CaF2 wafer, CaF2 plate

Applicable wave band

0.12um ~ 10um

Refractive Index

1.6921~1.3161 (at 0.13 μm ~ 10 μm)
1.39908 (at 5 μm)

Reflection loss

5.4% at 5μm

Absorption coefficient

7.8 x 10E-4 /cm (at 2.7μm)

Melting Point

Thermal Conductivity

9.71 W/K.m

Kirschner Hardness


Elasticity Coefficient


Thermal conductivity

9.71 W/m.K

Thermal expansion coefficient

18.85 x 10-6∕℃

Dielectric constant

6.76 at 1MHz

Maximum size

 Diameter 100mm (Single crystal)
 Diameter 375mm (Polycrystalline)

Material Standard Size Surface quality
Calcium fluoride(CaF2) windows

(Single crystal window) or
(Polycrystalline window) or
(Raman grade)
φ5.0mm x 1.0mm
φ25mm x 1.0mm
φ25.4mm x 2.0mm
φ50mm x 2.0mm
φ50.8mm x 6.0mm
φ100mm x 2.0mm
10 x 10 x 1.0mm
75 x 25 x 1.0mm
75 x 25 x 2.0mm
Or others
Polishing:             Double side optical-polished or CMP-polished
Roughness:          Ra<1.5nm or Ra<10nm, Ra<0.5nm, 
Size Tolerance:          +/-0.1mm
Thickness Tolerance: +/-0.1mm or +/-0.05mm
Parallelism:           3 minutes, 1 minute, 30 seconds or higher
Surface Finish:      60-40, 40-20, 20-10 (scratch-dig)
Surface Figure:      1/2λ, 1/4λ or higher
Chamfer:                0.25mm × 45°

Calcium fluoride (CaF2) window have a wide transmission range (good transmission in wavelength range of 0.13μm~10μm), low stress birefringence (no obvious intrinsic birefringence in >200nm), high uniform refractive index, and mechanical properties Stable, non-deliquescent, strong resistance to radiation damage, etc., 
Calcium fluoride (CaF2) is an ideal material for the production of various optical windows, prisms and lenses and other optical components.

We can customize different size and thickness of Calcium fluoride (CaF2) optical window upon requirements, such as Calcium fluoride (CaF2) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.
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Contact Us

  • Tel: (+86) 1506 0796 451
  • Fax: (+86) 0597 2212602
  • Email:
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  •    9 AM ~ 6 PM, Monday to Friday
  • Main office: A7, No. 501, Denggaoxi Road, Xipi street, Xinluo District, Longyan, Fujian, China