Small-Signal Gain Measurements in a Ti: Al2O3 Amplifier

摘要

A small-signal single-pass power gain of e to the 5.2 power approximately equal to 180 has been measured for a signal in the pi polarization at 790.7 nm in a longitudinally pumped Ti:Al203 amplifier. A double-pass power gain of e to the 9.2 power approx. equal to 10,000 has been attained for the same polarization at 799.8 nm. The ratio of the gain cross sections at 632.8 and 790.7 nm is 1/25. The lifetime of the upper lasing level decreases with increased pumping, probably as the result of amplified spontaneous emission. Reprints. (RH)