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Optics Letters

Stimulated emission and tunable gain from Rh^2+ ions in RbCaF_3 crystals

Richard C. Powell, Gregory J. Quarles, Joel Jerome Martin, Charles A. Hunt, William A. Sibley

Published May 1, 1985• 13 citations
Publisher

Abstract

Stimulated emission was detected in RbCaF(3):Rh(2+) crystals through the observation of power-dependent shortening of the fluorescence lifetime and narrowing of the emission band with a distinct threshold. In addition, single-pass gain was observed to be tunable between about 700 and 720 nm.
DOI
10.1364/ol.10.000212

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Solutions of the rate equations for a two-level system describing spectral properties in the presence of stimulated emission under picosecond-pulse pumping conditions are examined. The materials of interest are broad band tunable, vibronic laser crystals whose lasing properties under normal pumping conditions have been related to spectral properties through the McCumber theory1. The population inversion at threshold can then be determined by three methods: lifetime shortening, band narrowing, and peak gain measurements.
Optical absorption cross sections and the fluorescent quantum efficiency in ruby have been determined. This data has been used to correlate calculations with the analysis of the preceding paper. Stimulated emission from ruby under pulsed excitation has been studied in some detail; the observations are found to depend strongly on the perfection of the particular crystal under study. A peak power output of approximately 5 kw, total output energy of near 1 joule, beam collimation of less than ${10}^{\ensuremath{-}2}$ rad, and a spectral width of individual components in the output radiation of about 6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$A at 6943 A have been measured. It is suggested that mode instabilities due to temperature shifts and a time-varying magnetic field are contributing to an oscillatory behavior of the output pulse.