Nearly degenerate four-wave mixing in a traveling-wave semiconductor laser amplifier

Inoue, Kyo; Mukai, Takaaki; Saitoh, Tadashi
October 1987
Applied Physics Letters;10/5/1987, Vol. 51 Issue 14, p1051
Academic Journal
Nearly degenerate four-wave mixing (NDFWM) in a traveling-wave semiconductor laser amplifier is demonstrated by simultaneously injecting two lights of slightly different frequencies in the same direction. A new frequency light at an expected frequency for NDFWM is observed with the same order of output as that of the injected light. The output power ratio of the three beams is strongly dependent on the sign of the frequency detuning. Theoretical analysis, in which the carrier rate equation is coupled with nonlinear Maxwell’s equations, explains the experimental results well. The observed behaviors are attributed to a unique third-order nonlinearity stemming from saturation-induced refractive index change in the semiconductor gain medium.


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