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Color Switching in a Mode-Locked Optical Phase-Conjugate Resonator

B.E. Anderson, Jie Zhao, Zhifan Zhou, Rory W. Speirs, K. M. Jones, Paul D. Lett

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We construct a phase-conjugate resonator which passively mode-locks, produces pulsing, and is unconditionally stable. The resonator uses non-degenerate four-wave mixing in rubidium vapor and the output switches between the two non-degenerate colors.
DOI
10.1364/cleo_at.2024.jw2a.192

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Phase conjugation is an nonlinear effect that results from the four-wave-mixing process. This peculiar effect, in analogy to a mirror, reflects an incident beam in a way that the reflection constitutes the time-reversal of the original beam. By combining the phase conjugate mirror with ordinary mirrors, a special resonator, called phase conjugate resonator (PCR), is constructed. The phase conjugate resonator has been used in a wide range of applications, including phase aberration correction, image transmission, holography, and phase sensing using interferometers. Here, we explore theoretically the properties of phase conjugate mirror by investigating its action upon a variety of quantum states. In addition, we analyze the input-output relations of a phase conjugate resonator. Experimental results are reported that faithfully verify PCR's enhanced stability as compared to normal resonators. Furthermore, we observe a linewidth narrowing effect that is only present in the phase conjugate resonator.