Coherence Properties of a Pulsed Ruby Laser
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The coherence properties of a pulsed ruby, multi-mode laser were determined by recording the time-averaged effect of the radiation field on photographic emulsion. The recorded relative intensity distributions were analyzed and compared with a theoretical, single mode prediction. The laser beam was expanded to a one-inch diameter beam. Then, with the aid of a Twyman-Green interferometer, a temporal coherence length of approximately 1.27 centimeters was observed. Also, for an aperture radius of 0.51 millimeters, in conjunction with a modified Youngs experiment, a spatial coherence length of approximately 2.2 millimeters was observed.
- Lasers and Masers