학술논문
Excited state absorption measurements and laser potential of Cr4+ doped Ca2GeO4
Document Type
Original Paper
Author
Source
Applied Physics B: Lasers and Optics. 06 1997 64(6):647-650
Subject
Language
English
ISSN
0946-2171
1432-0649
1432-0649
Abstract
4+: doped Ca2 GeO4 in the 450–2000 nm spectral region at room temperature are presented. Weak ESA bands due to the ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(F)$ ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(P)$ ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(F)$ transition are observed between 1200 and 2000 nm and stronger ESA bands due to ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(F)$ ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(P)$ ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(F)$ peak below 1200 nm. The overlap of the ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(F)$ ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(P)$ ${}^{3}T{}_{2}\to {}^{3}T{}_{1}(F)$ ESA band with the emission which extends from 1100 to about 1600 nm will significantly affect the laser performance of Cr4+ doped Ca2 GeO4 . 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.