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CaF2

Related link:  CaF2 Windows and Lenses   


CaF2 Eigenschaften & Übertragungs Kurve


Kalzium Fluorid kann in den ultravioletten, sichtbaren und Infrarot-Spektral Regionen verwendet werden. Kalzium Fluorid hat eine Übertragung von über 90% zwischen 0,25 und 7 µm.


Kalzium Fluorid ist doppelt so hart wie Barium-Fluorid und auch weniger anfällig für thermischen Schock. Es wird aber häufig in kryogenisch gekühlten wärmebildsystemen eingesetzt. Es ist günstiger als Barium-Fluorid. CaF2 ist Diamant drehbar.


  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