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HGO grows LiF crystals
in house using Czochralski technology. LiF crystal or lithium fluoride crystal
is an optical material with outstanding transmittance in VUV region. It is also
used for windows, prisms, and lenses in the visible and infrared in
0.104µm-7µm.
LiF single
crystal is sensitive to thermal shock and would be attacked by atmospheric
moisture at 400°C. When working at a high temperature of 600°C, the LiF crystal
softens and is slightly plastic, so it can be bent into radius plates. In
addition irradiation produces color centers. Hence, users should take measures
to protect LiF crystals from moisture and high energy radiation damages.
What is more LiF
can be cleaved along (100) plane and less commonly (110) plane. The optical
characteristics are good and yet the structure is not perfect and cleavage is
difficult.
Product Origin:
ChinaShipping Port:
Fuzhou, ChinaLead Time:
3-4weeks
Descriptions:
HGO grows LiF crystal lithium fluoride. LiF crystal or lithium fluoride crystal is an optical material with outstanding transmittance in VUV region. It is widely used for windows, prisms, and lenses in the visible and infrared in 0.104µm-7µm.
Main application:
1) X-ray monochromator plates UV photomultiplier tubes
2) Optical material for VUV applications
3) Windows, prisms, and lenses
Main Features:
1) Tends to create color centers.
2) Max temperature for application:400°C
3) Excellent VUV region transmittance
4) Sensitive to thermal shock
Optical properties of LiF crystal:
|
Transmission Range |
0.105 … 6 µm |
|
Refractive Index |
no = 1.37327@2.5µm, 1.624@0.12 µm |
|
Reflective Loss |
4.4% @4.0 µm |
|
Poisson Ratio |
0.326 |
|
Absorption Coefficient/cm-`1 |
0.74×10-3@2.7µm |
Basic properties of LiF crystal:
|
Density |
2.64g/cm3 |
|
Melting Point |
870℃ |
|
Molar Mass |
25.9394 |
|
Lattice Parameters |
4.0279 Å |
|
Thermal Conductivity |
4.01 W/(m K) |
|
Specific Heat |
1562 (J kg-1 K-1) |
|
Thermal Expansion Coefficient |
28.1 - 34.8 (10-6/K) |
|
Knoop Hardness |
102–103kg/mm2 |
|
Mohs Hardness |
3 |
|
Young's Modulus |
64.79 GPa |
|
Shear Modulus |
55.14 GPa |
|
Bulk Modulus |
62.03 GPa |
|
Rupture Modulus |
10.8 MPa |
|
Elastic Coefficient |
C11 = 112 / C12 = 45.6 / C44 = 3.2 GPa |
|
Crystal Type |
Fm3m, cubic, NaCl type structure |
|
Dielectric Constant |
9.0 @ 25 °C, f = 100...109 Hz |
|
Solubility in Water |
0.27 (g/100 cm3) @ 18 °C |
|
Apparent Elastic Limit/ MPa |
11.2@1620 psi |
|
Cleavage |
-100 |
HGO offers LiF specifications:
|
Orientation: |
<100> |
|
Wavefront Distortion: |
λ/4per inch @ 632.8 nm |
|
Dimension Tolerances： |
rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm |
|
Surface Quality: |
20/10 Scratch/Dig MIL-O-1380A |
|
Parallelism: |
< 20″ |
|
Perpendicularity: |
< 10′ |
|
Clear Aperture: |
> 90% |
|
Surface Flatness: |
< λ/8 @ 632.8 nm |
|
Chamfer: |
< 0.25 mm @ 45deg. |
|
Size |
Upon customer request |
|
Quality Warranty Period |
One year under proper use |
Why Choose HGO ?
HG OPTRONICS.,INC. is one of few growers who LiF crystals in house. The use of high quality starting materials for crystal growth, whole boule interferometry, precise inspection of scattering particle in crystal using He-Ne laser and delicated measurement of bulk losses using spectrophotometer assures that each crystal will comply with customer’s specification and perform well.
In addition, we can also produce other types of window crystals like YAG crystals, BaF2,MgF2 Crystals, etc.
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