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Yb:CaF2
- Yb3+:CaF2, grown by Czochralski tech., is with long fluorescent lifetime and broad absorption bands, making it suitable for diode pumping. It has limited nonlinear effects under intense irradiation.
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Introduction：
Ytterbium-doped Calcium fluoride, grown by Czochralski technique, is with long fluorescence lifetime and broad absorption bands, which make it an ideal material for laser diode pumping.
Yb3+:CaF2 exhibits broad emission bandwidth as well as limited non-linear effects under intense irradiation, supporting generation of ultra-short pulses and high-power operation.
Features：
• Low quantum defect ,Long fluorescence lifetime;
• Wide optical transmission range, from 0.12um to 10μm;
• Low dispersion behavior;
• Limited nonlinear effects under intense laser irradiation;
• Customized coatings are available.
Figure 1. Absorption Coefficient and Transimission spectra of a 3.0at%Yb3+-doped CaF2 crystal
Table1. Properties of Yb3+:CaF2
|
Dopant concentration [at%] |
1-10 |
|
Absorption peak wavelength [nml |
979 |
|
Absorption cross section @ 980 nm [cm2] |
5.4x10-21 |
|
Emission cross section @ 1035 nm [cm2] |
2.3x 10-21 |
|
Fluorescence Litetime [ms] |
2.2 |
|
Refractive index @ 1035 nm |
1.42866 |
|
Crystal structure |
cubic |
|
Cleavage plane |
(111) |
|
Melting point [℃] |
1418 |
|
Nonlinear refractive index (CaF2 ) [cm 2 W -1 ] |
1.9 x 10 -16 |
|
Density (CaF2 ) [g/cm 3 ] |
3.18 |
|
Thermal conductivity (CaF2 ) [W m -1 K -1 ] |
9.71 |
|
Thermal expansion coefficient [K -1 ] 18.41 x 10 -6 |
18.41 x 10 -6 |
|
Mohs |
4.0 |
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