Abstract

A single-isotope He–Ne laser gyro has been constructed and operated, and the results have been compared with those obtained from a multi-isotope system. Strong mode competition in the single-isotope ring laser has been found in a region 10–30 MHz near line center. The sense of the mode competition has been found to depend on the direction of rotation of the laser cavity. Hence, by mechanical dithering of the laser, the time-averaged effect of the mode competition can be zero. However, with a current unbalance, a large dispersion-type null shift is found near line center. Unlike the linear laser and the multi-isotope ring laser, the single-isotope ring laser is characterized by strong mode competition such that only a single longitudinal mode oscillates over most of the free spectral range.

© 1972 Optical Society of America

Effects of Radiation Trapping on Mode Competition and Dispersion in the Ring Laser

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Isotope Dependence of Gas Laser Intensity Profiles

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Periodic Faraday Bias and Lock-In Phenomena in a Laser Gyro

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