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Related link: CaF2 Windows and Lenses 
CaF2 特性と透過曲線
フッ化カルシウムは、紫外、可視、赤外スペクトル領域で使用することができます。フッ化カルシウムは0.25 と7µm の間の 90% の上の伝達を有する。
フッ化カルシウムはフッ化バリウムの2倍の硬質であり、また熱衝撃を受けにくい。しかし、それは一般的に低温冷却熱画像システムで使用されています。フッ化バリウムよりも安価です。CaF2 はダイヤモンド身近です。
|
Property |
Specification |
|
Transmission Range |
0.13µm to 7.0µm |
|
Density |
3.18 g/cm3 |
|
Thermal Expansion |
18.85 x 10-6 /°C |
|
Surface Finish |
Polishes of 20-10 scratch-dig are mostly specified for use in UV & visible applications. Typical specifications for surface quality in the infrared are a 40-20 scratch dig in the 0.75 to 3µm spectral region & 60-40 scratch-dig for the 3-7µm area. |
|
Surface Figure |
In the UV & Visible spectral regions, surface figure ranges from 1/10 wave to 1/4 wave @ 0.6328µm. In the infrared, typical required surface figure ranges from 1/4 wave to 2 waves @ 0.6328 µm & are specified depending on the system performance requirements. |
|
AR Coating Options |
Available coatings for CaF2 include BBAR for 0.8 to 2.5µm, 3 to 5µm or the 1 to 5µm spectral regions. |
|
Typical Applications |
Cryogenically cooled thermal imaging, Astronomical, Microlithography, Excimer Laser applications. |
|
Products Manufactured |
Lenses, Aspheric lenses, windows, Optical Beamsplitters, Optical Filters, Wedges, Prisms. |
|
Wavelength (µm) |
Index of Refraction (n) |
|
1.060 |
1.428 |
|
2.058 |
1.424 |
|
4.000 |
1.410 |
|
5.893 |
1.387 |
|
8.251 |
1.344 |
|
9.429 |
1.316 |
