We have investigated the use of stimulated Brillouin scattering (SBS) in a ring resonator to reduce the threshold of SBS phase conjugation for radiation from a frequency-narrowed Cr, Tm, Ho:YAG laser operating at 2.12 μm. Compared with an alternative scheme for threshold reduction, the loop scheme, we find that the ring resonator has a lower SBS threshold and a similar fidelity, but exhibits large fluctuations in output. We attribute these to fluctuations in the cavity length that detune the mode frequency from the center of the Brillouin gain bandwidth. Mode beating is occasionally observed with the beat frequency’s being strongly influenced by the effect of a Brillouin-induced phase shift.
© 1995 Optical Society of America
A. M. Scott and W. T. Whitney, "Characteristics of a Brillouin ring resonator used for phase conjugation at 2.1 μm," J. Opt. Soc. Am. B 12, 1634-1641 (1995)