Product IntroductionVisible/Infrared grade

Visible/Infrared Grade
- CaF2 with high optical transmittance and light weight -

CaF2 has high optical transmittance in the visible light/infrared regions. Combination with glass shows high chromatic aberration compensation capability due to its lower dispersion than glass and extraordinary low dispersion. The lighter weight than extraordinary low dispersion optical glass (ED glass) can reduce the burden for a photographer using a motion camera.

Applications:
Lenses for TV cameras, changeable lenses for digital cameras, lenses for astronomical telescopes/microscopes, and window material/sample holders for infrared analyzers

Refractive index

Wavelength(nm)
(in air)
Refractive index for air
(22℃ 1013.25hPa)
2325.42 1.422124
1970.09 1.424012
1529.58 1.426127
1128.64 1.428112
1013.64 [t] 1.428800
852.110 [s] 1.430029
706.519 [r] 1.431672
656.273 [C] 1.432459
643.847 [C'] 1.432689
632.820 1.432886
587.562 [d] 1.433847
546.075 [e] 1.434935
486.133 [F] 1.437015
479.992 [F'] 1.437273
435.835 [g] 1.439469
404.656 [h] 1.441489
365.015 [i] 1.444888

Accuracy of measurement
2325.42nm~1128.64nm ±5x10-6
1013.98nm~365.015nm ±2x10-6
Humidity 50%

Sellmeier's dispersion formula

n2-1=A1λ2/(λ2-B1)+A2λ2/(λ2-B2)+A3λ2/(λ2-B3)

A1
5.692465192E-01
A2
4.695025627E-01
A3
1.325486639E+04
B1
2.376435344E-03
B2
1.022975163E-02
B3
4.106830854E+06

22℃, 1013.25hPa, in air

Optical properties

νd
95.22
θgF
0.5386
ΔθgF
0.0566
Excimer Laser Grade