An investigation of relaxed alignment tolerance in monolithic ring lasers is presented. It was found that the relaxed alignment tolerance is strongly dependent on the out-of-plane angle. A preferred region for the out-of-plane angle is proposed. In this region the resonator has greatly relaxed alignment tolerances, and the unidirectional operation can be obtained under a much-lower magnetic field. Two lasers have been constructed in the region, and satisfactory performance was found, in good agreement with the theoretical analysis.

Stabilities of output power and frequency of monolithic semi-nonpianar ring lasers are investigated in experiment.Fluctuation in output power is less than +-O. 1 % with output power 1 .5W over a period of 3 hours. In free running, the root Allan variance of beat frequency between two monolithic lasers is lx 10b0 for averaging time is. Slow frequency drift is less than 10 MHz over a period of 1 hour.

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