title: Dynamic measurements of phase shifts in laser amplifiers.
abstract: Optical length variations in laser amplifier rods have been studied using two interferometers and the coherent 6328 A output from a helium-neon laser for the probe beam. The phase shifts measured during the excitation or pump period amount to many pi 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.
authors.affiliation: Aerospace Group, Hughes Aircraft Company, Culver City, California, USA.
authors.forename: A Y
authors.initials: AY
authors.lastname: Cabezas
authors.forename: L G
authors.initials: LG
authors.lastname: Komai
authors.forename: R P
authors.initials: RP
authors.lastname: Treat