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Spectroscopy and first laser proof of praseodymium lanthanum scandium borate

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Abstract

We report spectroscopic data and first time lasing of Pr3+: LaSc3 (BO3 )4 Polarization dependent absorption- and fluorescence spectra are measured under continuous wave excitation. The emission cross sections of selected transitions originating from levels 1D2 and 3P0 are determined to be 4.10−21 cm2 and 6·1019 cm2, respectively. Due to strong multiphonon relaxation (3P01D2) the lifetime of the 3P0- level is as short as 30 ns. Other than expected a comparatively strong concentration quenching of the 1D2 level lifetime can be observed probably caused by two resonant cross relaxation processes. Efficient lasing is demonstrated on the transition 3P03F2 at 648 nm under pulsed dye laser excitation. The slope efficiency is 38 % with respect to the incident pump energy.

© 1999 Optical Society of America

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