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  • Yb:CaF2

  • 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.
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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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