Physics and Applications of Coherently Coupled Phase Conjugators
Abstract
We investigated photorefractive double phase-conjugation oscillators. We demonstrated, both theoretically and experimentally, that the beat frequency between the counterpropagating waves in these oscillators is proportional to the nonreciprocal phase shift of the resonator. We examined the frequency locking behavior of such an oscillator when a weak seed beam is injected into the resonator along the same direction as the phase-conjugate output. Measurements were taken with both coherent and incoherent (with respect to the pump) seed light, and the beat frequency was measured as a function of the seed intensity and the nonreciprocal phase shift. Larger seed intensities are required for frequency locking the phase-conjugate ring oscillators when compared to conventional ring laser gyros, showing the superiority of the former device for inertial sensing. Incoherent seed light does not cause frequency locking even at high seed levels. The experimental results were shown to be in good agreement with theory.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1991
- Accession Number
- ADA239029
Entities
People
- I. Mcmichael
- M. Rosker
- P. Yeh
- R. Saxena
- W. Christian