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Yb3+: CaF2 - Ytterbium Doped Calcium Fluoride
- 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 (Yb: CaF2), grown by Czochralski technique, is with long fluorescence lifetime and broad absorption bands, which make it an ideal material for laser diode pumping. Yb: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.
CASTECH's laser crystal Yb: CaF2 is featured by
• Low quantum defect ,Long fluorescence lifetime
• Wide optical transmission range, from 0.12μm to 10μm
• Low dispersion behavior
• Limited nonlinear effects under intense laser irradiation
• Customized coatings are available
Table 1. Basic Properties
|
Dopant Concentration |
1~10 at.% |
|
Absorption Peak Wavelength |
979 nm |
|
Absorption Cross Section @980 nm |
5.4 × 10-21 cm2 |
|
Emission Cross Section @1035 nm |
2.3 × 10-21 cm2 |
|
Fluorescence Lifetime |
2.2 ms |
|
Refractive Index @1035 nm |
1.42866 |
|
Crystal Structure |
Cubic |
|
Cleavage Plane |
(111) |
|
Melting Point |
1418 ℃ |
|
Nonlinear Refractive Index |
1.9×10-16 cm2/W |
|
Density |
3.18 g/cm3 |
|
Thermal Conductivity |
9.71 W/m/K |
|
Thermal Expansion Coefficient |
18.41×10-6 /K |
|
Mohs Hardness |
4 Mohs |
Figure 1. Absorption Coefficient and Transimission Spectra of a 3.0 at.%Yb3+ Doped CaF2 Crystal
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