Abstract

Optical length variations in laser amplifier rods have been studied using two interferometers and the coherent 6328 Å output from a helium-neon laser for the probe beam. The phase shifts measured during the excitation or pump period amount to many π radians even for short (0.6 cm) and moderately pumped rods of ruby and neodymium glass. The results indicate the predominantly thermal nature of these pump-induced phase shifts.

© 1966 Optical Society of America

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