Abstracts 1997

Abstract of Publication No. 285

T. C. Brunold, H. U. Güdel, M. F. Hazenkamp, G. Huber and S. Kück
Excited state absorption measurements and laser potential of Cr4+ doped Ca2GeO4
Appl. Phys. B 64, 647-650 (1997)      Full Text (PDF)      DOI-Link     

Abstract: Polarized continuous wave excited state absorption (ESA) measurements on Cr4+ doped Ca2GeO4 in the 450-2000 nm spectral region at room temperature are presented. Weak ESA bands due to the 3T2 3T1(F) transition are observed between 1200 and 2000 nm and stronger ESA bands due to 3T2 3T1(P) peak below 1200 nm. The overlap of the 3T2 3T1(F) ESA band with the emission which extends from 1100 to about 1600 nm will significantly affect the laser performance of Cr4+ doped Ca2GeO4. The effective peak stimulated emission cross section at 1350 nm in E||b polarization is only about 3 × 10–20 cm2. However, our results indicate that tunable laser action between 1300 and 1500 nm should, in principle, be possible.

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