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LiF

LiF crystal

LiF crystal has the following exceptional properties that make it a very important optics single crystal:

(1) High optical transmittance from the vacuum ultraviolet to the infrared spectrum region (0.11-7μm) and shows excellent transmittance in the VUV regions.

(2) Used for Optical prisms, lenses, wedges, windows, other optical components,and etc.

Transmission Range (µm)	0.12 ~ 6
Refractive Index at 0.6 µm	1.39181
Reflection Loss at 0.6 µm	5.2% (2 surfaces)
Absorption Coefficient at 2.7µm (cm-1)	0.74×10-3
Density (g/cm3)	2.639
Melting Point (℃)	870
Thermal Conductivity at 314K (Wm-1K-1)	4.01
Thermal Expansion at 283K (K-1)	37×10-6
Knoop Hardness	102 with 600g indenter
Specific Heat Capacity (J Kgm-1K-1)	1562
Elastic Coefficient	C11=112; C12=46; C44= 63.5
Apparent Elastic Limit	11.2 Mpa (1620 psi)
Poisson Ratio	0.326
Solubility in 100g water at 20℃ (g)	0.27

Specifications

Size	Diameter up to 160mm;
Inclusion	None visible
Dimension tolerance	±0.1mm
Oriential tolerance	2 arc minutes
Angle tolerance	10 arc minutes
Scratch/Dig code	40/20 to MIL-O-13830A
Parallelism	20 arc seconds
Flatness	λ/10 @ 632.8 nm

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