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Optics Communications

Fluctuations in the phase-conjugate signal generated via degenerate four-wave mixing

Prem Kumar, Jeffrey H. Shapiro, Roy S. Bondurant

Published Jun 1, 1984• 9 citations
Publisher
DOI
10.1016/0030-4018(84)90344-4

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Experimental results are presented regarding the generation and bistable behavior of a conjugated signal obtained through intracavity nearly degenerate four-wave mixing in a semiconductor laser amplifier injected with both pump ($\ensuremath{\omega}$) and probe ($\ensuremath{\omega}\ensuremath{-}\ensuremath{\delta}\ensuremath{\omega}$) frequencies. Conjugated reflectivities at $\ensuremath{\omega}+\ensuremath{\delta}\ensuremath{\omega}$ larger than 500% with 35% efficiency together with bistable behavior in the three signals (pump, probe, and conjugated) are reported.
We report on the enhancement of phase conjugation degenerate four-wave mixing (DFWM) in hot atomic Rb vapor by using a Bessel beam as the probe beam. The Bessel beam was generated using cross-phase modulation based on the thermal nonlinear optical effect. Our results demonstrated that the DFWM signal generated by the Bessel beam is about twice as large as that generated by the Gaussian beam, which can be attributed to the extended depth and tight focusing features of the Bessel beam. We also found that a DFWM signal with reasonable intensity can be detected even when the Bessel beam encounters an obstruction on its way, thanks to the self-healing property of the Bessel beam. This work not only indicates that DFWM using a Bessel beam would be of great potential in the fields of high-fidelity communication, adaptive optics, and so on, but also suggests that a Bessel beam would be of significance to enhance the nonlinear process, especially in thick and scattering media.