UV-visible luminescence properties of the broad-band Yb:CALGO laser crystal

A. Jaffres; S. K. Sharma; P. Loiseau; B. Viana; J. L. Doualan; R. Moncorgé

doi:10.1117/12.2075587

16 March 2015 UV-visible luminescence properties of the broad-band Yb:CALGO laser crystal

A. Jaffres, S. K. Sharma, P. Loiseau, B. Viana, J. L. Doualan, R. Moncorgé

Proceedings Volume 9359, Optical Components and Materials XII; 93590V (2015) https://doi.org/10.1117/12.2075587
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

Yb:CALGO is now recognized to exhibit outstanding properties for the production of high-power and ultra-short laser pulses in the near infrared spectral range. However, various UV-visible absorption bands can be also observed due to different types of charge transfer mechanisms. Some of them are assigned to the formation of color centers due to small polarons and others to O^2-→Yb³⁺ ligand-to-metal charge transfer (LMCT) transitions. The former can be removed by using adequate thermal treatments. The latter are intrinsic and they are very intense with cross sections of about two orders of magnitude larger that the near infrared ones. In fact, such LMCT absorption bands are responsible for relatively large changes of ionic polarizabilities and to non-negligible pseudo-nonlinear changes of refractive indices which should certainly affect the laser properties of Yb:CALGO at high pump power levels.

Citation Download Citation

A. Jaffres, S. K. Sharma, P. Loiseau, B. Viana, J. L. Doualan, and R. Moncorgé "UV-visible luminescence properties of the broad-band Yb:CALGO laser crystal ", Proc. SPIE 9359, Optical Components and Materials XII, 93590V (16 March 2015); https://doi.org/10.1117/12.2075587

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