LiF Optical Crystals

LiF (Lithium Flouride) crystals shows excellent transmittance in the VUV region. It is used for windows, prisms, and lenses in the visible and infrared in 0.104 μm - 7 μm. LiF crystalis sensitive to thermal shock and would be attacked by atmospheric moisture at 400°C.

Product Details



Description

LiF (Lithium Flouride) crystals shows excellent transmittance in the VUV region. It is used for windows, prisms, and lenses in the visible and infrared in 0.104 μm - 7 μm. LiF crystalis sensitive to thermal shock and would be attacked by atmospheric moisture at 400°C. In addition irradiation produces color centers. Modest precautions should be taken against moisture and high energy radiation damage. Besides LiF is softens at 600°C and is slightly plastic that can be bent into radius plates. The material can be cleaved along (100) and less commonly (110). Although the optical characteristics are good the structure is not perfect and cleavage is difficult. High quality LiF is usually grown by modified Bridgman technique.

Lithium Flouride shows good optical properites. It can be used for windows, prisms and lenses in the vacuum UV,visibel and infrared. Because of its paricular lattice structure, LiF can also be used as X-ray diffraction devices.

Features

  1. Excellent Transmission from 110nm to 7μm;

  2. Optically isotropic, middle hard;

  3. Hygroscopic, unsolvable in water;

  4. Sensitive to thermal shock,Cleaved along (100);



Specification

Physical Properties

Crystal type

cubic

Lattice constant, Å

a=4.026

Density, g/cm3

2.64

Melting point,℃

870

Refractive index @ 1.0μm

n=1.387

Transmission range, μm

0.12-6




Specifications for LiF windows

Spectal range

UV, VIS, IR

Surface quality

60-40 S&D

Clear aperture

90% of the diameter

diameter tolerance

+0, -0.1 mm

Thickness tolerance

±0.1

Surface flatness

λ/4 @ 633 nm

parallelism

<3 arcmin


Polishing Specification for Optical GradeⅠ

Orientation Tolerence

< 1°

Thickness/Diameter Tolerance

±0.10 mm

Surface Flatness

<(λ-2λ) @632nm

Wavefront Distortion

<(2-4)λ @632nm

Surface Quality

80/50

Parallel

10ˊ

Perpendicular

60ˊ

Clear Aperture

>90%

Chamfer

<0.2×45°


Polishing Specification for Optical Grade Ⅱ

Orientation Tolerence

< 0.5°

Thickness/Diameter Tolerance

±0.10 mm

Surface Flatness

<(λ/2-λ/4) @632nm

Wavefront Distortion

<(1-2)λ @632nm

Surface Quality

60/40

Parallel

Perpendicular

30ˊ

Clear Aperture

>90%

Chamfer

<0.2×45°



Polishing Specification for Optical Grade Ⅲ

Orientation Tolerence

< 0.2°

Thickness/Diameter Tolerance

±0.02 mm

Surface Flatness

(λ/4-λ/6) @632nm

Wavefront Distortion

<(λ-λ/2) @632nm

Surface Quality

40/20

Parallel

45〞

Perpendicular

20ˊ

Clear Aperture

>90%

Chamfer

<0.2×45°


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