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Optical Fluoride Crystals LiF, CaF2, BaF2, MgF2
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Lithium Tetraborate
Optical crystals, such as CaF2, BaF2, MgF2, LiF, NaCl, KCl, KBr, etc, are widely used in IR optics and UV optics. High transparency and low loss optical windows, prisms, lenses, achromatic lenses and parallel planes have been fabricated in these optical materials. We supply high quality, low cost and large size crystals based on the Czochralsky and Bridgeman Methods. These crystals are widely applied to the entire optical wavelength range, from vacuum ultraviolet (0.11 µm) to far infrared (40 µm). MolTech is ready to meet our customers' various requirements for dimensions and other specifications.
   Lithium fluoride (LiF) crystals are well-suitedl for manufacturing optical elements (mirrors, windows, lenses) for UV, visible and IR applications. These crystals are optically isotropic, middle hard, hygroscopic, unsolvable in water.
   Magnesium Fluoride (MgF2) is the only optical material combining wide spectral transmittance band with birefringince phenomenon and satisfactory thermal expansion coefficient for isotropic crosssection. It is used for UV-radiation sources and receivers windows manufacture; for optical elements of interference-polarization filters, as laser resonator optics elements in quantum electronics and as active material in IR and submillimeter band .
   Calcium Fluoride (CaF2 or Fluorite) crystals are transparent in wide spectrum band. The product finds use in windows, lenses operating in UV and IR spectrum band. Laser Use: Calcium Fluoride is also used as a host lattice for laser crystals. Due to its composition, CaF2 has a much longer useful life than most materials when used in fluorine environment.
   Barium Fluoride (BaF2) crystals are transparent in wide spectrum band. The product finds use in windows, lenses of special types of objectives, as mirrors substrate in optical systems operating in UV and IR spectrum band.
Physical Properties:
Material
LiF
MgF2
CaF2
BaF2
Transmission range (thickness 10 mm), µm
0.12 - 6.50
0.11 - 8.0
0.15 - 9.00
0.15 - 15.00
Crystal structure
cubic
tetragonal
cubic
cubic
Lattice constant, Å
a = 4.026
a = 4.64; c = 3.06
a = 5.462
a = 6.196
Density, g/cm3
2.60
3.177
3.18
4.89
Mohs hardness
4
6
4
3
Refractive indexes
n = 1.387
ne = 1.3852; no = 1.3796
1.6921 - 1.3161
n = 1.4686
Solubility, g/100 g water at 18C
-
7.6 x 10-3
1.6 x 10-3
0.12

Specifications for windows:
Surface quality, scratch - dig 60 - 40
Clear aperture 90% of diameter
Diameter tolerance, mm +0.0 / -0.1
Thickness tolerance, mm ± 2
Flatness »/4 (633 nm)
Parallelism, arc min 3
” N < 0.5 x 10-5
Optical losses, cm-1 for MgF2-UV (200 nm) < 0.07
Optical losses, cm-1 for MgF2-UV (500 nm) < 0.02
Optical losses, % for CaF2 (4 µm) 5.6 (two surfaces)
Optical losses, cm-1 for BaF2 at 0.2 µm - < 0.20; 0.4 µm - < 0.08; 10.6 µm - < 0.13

Lenses and prisms made from fluorides are available at request.

I N Q U I R Y    F O R M :

Material:
Quantity of elements:
Application:

polished sites:

BLOCK    or  BLOCK
 a-b b-c a-c
or d  
Orientation:
(if applicable)
Dimensions/Tolerances:
For example:
10.0 +/- 0.1
AR-coating:
a = mm;
c = mm
b = mm or
dia. = mm;
This field is for additional information such as application,
comments, add. requirements etc.

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