Nanjing Crylink Photonics Co.,Ltd
Growing crystal, Lingling Value.
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Due to the toughness and the flexible and cheap production process, CaF2 has been used in many substrate materials for laser crystals. As an amplifying ion, Yb3+ also allows a three-level laser scheme, leading to low quantum defects and a significantly longer fluorescence lifetime. Yb3+:CaF2 can also provide a high optical efficiency and high output powers due to the reduced thermal load. Recently, ytterbium-doped alkaline-earth fluoride is mostly used in diode-pumped femtosecond laser and amplifiers. Alkaline-earth fluorides which can be easily grown by using the standard Czochralski or Bridgman technique show a great potential in the wide transmission range, high damage threshold and low dispersion behavior.
Features
Applications
Chemical and physical properties
|
Property |
Value |
|
Chemical formula |
Yb3+:CaF2 |
|
Crystal structure |
cubic |
|
Lattice parameters, |
5.462 |
|
Orientation |
[111] or [100] < ±0.5° |
|
Mass density |
3.18 g/cm3 |
|
Mohs hardness |
4 |
|
Young's modulus |
146 GPa |
|
Tensile strength |
2 GPa |
|
Melting point |
1418°C |
|
Thermal conductivity |
9.71 |
|
Specific Heat/ (Jg-1K-1) |
0.8876 |
|
Thermal Expansion /(10-6/°C @25°C) |
(16.5...19.4) |
|
Thermal shock resistance parameter |
800 W/m |
|
Refractive Index @ 1064 nm |
1.2996 |
Optical properties
|
Property |
Value |
|
Optical Density |
0.1 to 0.8 |
|
Fluorescence lifetime |
2.4ms |
|
Concentrations |
0.5 mol % ~ 30 mol % |
|
Emission wavelength |
1015 nm ~ 1060 nm |
|
Absorption Coefficient |
1.0 cm-1 ~ 7 cm-1 |
|
Ground state absorption cross section |
0.8x10-20 cm2 |
|
Emission state absorption cross section: |
2.2x10-20 cm2 |
|
Transmission |
10% to 90% |
|
Coatings |
AR≤ 0.2% @1030nm |
|
Damage Threshold: |
> 500 MW / cm2 |
Polishing Specification
|
Property |
Value |
|
Orientation Tolerence |
< 0.5° |
|
Thickness/Diameter Tolerance |
±0.05 mm |
|
Surface Flatness |
</8 @632 nm |
|
Wavefront Distortion |
</8 @632 nm |
|
Surface Quality |
10/5 |
|
Parallel |
10 |
|
Perpendicular |
15 |
|
Clear Aperture |
>90% |
|
Chamfer |
<0.1×45° |
|
Maximum dimensions |
2*2-15*15 mm×20mm |
Standard products
|
Material |
Dimensionsmm |
Coatings |
|
Yb(5%):CaF2 |
dia 5 |
AR≤ 0.2% @1030+940nm |
|
3x3 |
||
|
6x6 |
||