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BaF2

Related link:  BaF2 Lenses     


BaF2 特性と透過曲線


フッ化バリウム (BaF2) 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。フッ化バリウムは0.25 と9.5 µm の間の 90% の上の伝達を有する。



フッ化バリウムは、フッ化カルシウムと同じくらい硬く、さらに熱衝撃を受けやすい。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。それは、フッ化カルシウムよりもやや高価であり、大きなサイズで容易に利用可能ではありません。



  Property

 Specification

  Transmission Range

 0.15µm to 12.5µm

  Density

 4.89 g/cm3

  Thermal Expansion

 18.1×10-6 /°C @ 20°C+/-100°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. BaF2 is diamond tunable.

  Surface Figure

Surface figure of a 1/10 wave to 1/2 wave @ 0.6328µm are specified mostly on lenses for ultraviolet & visible use. In the infrared, typical required surface figure ranges from 1/2 wave to 2 waves 0.6328µm depending on the system performance requirements.

  AR Coating Options

Typical available coatings for BaF2 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, Laser applications.

  Products Manufactured

Lenses, Aspheric lenses, Windows, Optical Beamsplitters, Optical Filters, Wedges, Prisms.


Wavelength (µm)

Index of Refraction (n)

1.700

1.466

2.152

1.464

3.422

1.459

4.000

1.455

6.238

1.442

7.268

1.433

10.346

1.396


BaF2 Transmission Curve