Photon avalanche upconversion laser at 644 nm
- 19 March 1990
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 56 (12), 1083-1085
- https://doi.org/10.1063/1.103328
Abstract
We have obtained efficient laser action from Pr-doped LaCl3 using a novel pumping method. Pump energy is coupled into the crystal through Pr ions in an excited state rather than the ground state. Excited-state absorption is made possible by a regenerative feedback process (the photon avalanche) utilizing cross relaxation to convert the energy of a single ion in a high-lying state into energy shared by multiple lower lying state ions.Keywords
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