LiF Substrate

Lithium fluoride (LiF) crystal belongs to cubic crystal system, the cleavage plane is (100), it has excellent optical properties, especially in deep ultraviolet band. With the development of deep ultraviolet technology in recent years, lithium fluoride crystal has attracted more and more attention for its high transmittance and short cut-off wavelength in deep ultraviolet band.

OST Photonics offers high quality LiF substrates for researchers and industries. Crystal orientation, size and thickness can be customized according to your requirements.

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Features

  • Excellent optical properties

  • High transmittance and short cut-off wavelength in deep ultraviolet band

Applications

  • Optical windows, lenses, prisms and refractive elements in the ultraviolet-visible-infrared field

  • X-ray monochromator

Processing Capability

  • Orientation:<100>,<110>,<111>, etc.

  • Dimension: 1”, 2”, 10x10mm, 20x20mm, 30x30mm, etc.

  • Thickness: 0.5mm, 1.0mm, 2.0mm, 5.0mm, 10mm, 20mm, etc.

  • Available items: wafers, substrates, windows, prisms, blanks and customized optics

Specification and properties of LiF Substrates

Crystal System

Cubic

Lattice Constant

a=4.026 Å

Melting point

870 ℃

Density

2.635 g/cm3

Hardness

4.0 Mohs

Thermal Expansion Coefficient

37.0 x 10^-6 /K

Refractive Index

n=1.39

Transmission Wavelength

0.11-7.00 μm

Transmittance

> 90% @0.2~4.5 μm

Color Deviation Hf-Hc

0.00395

Temperature Coefficient (dn/dt x 10-6)

12.7 @0.6 m

Orientation

<100>,<110>,<111>, etc.

Orientation Tolerance

±0.5° or better

Dimension

1”, 2”, 10x10mm, 20x20mm, 30x30mm, etc.

Dimension Tolerance

±0.1 mm or better

Thickness

0.5mm, 1.0mm, 2.0mm, 5.0mm, 10mm, 20mm, etc.

Thickness Tolerance

±0.05 mm or better

Surface Finish

Single side polished (SSP)/Double sides polished (DSP)

Surface Roughness

≤10Å (5µm×5µm)

Package

Class 100 clean bag, Class 1000 super clean room