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CaF2

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

 CaF2 Transmission Curve