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Applied Physics Letters

Highly efficient phase conjugation using spatially nondegenerate four-wave mixing in a broad-area laser diode

Peter Kürz, R. Nagar, Takaaki Mukai

Published Feb 26, 1996• 20 citations
Publisher

Abstract

We report spatially nondegenerate four-wave mixing in a broad-area laser diode that acts as a fast phase conjugate mirror with nanosecond response times and high efficiencies. Phase conjugate reflectivities were found to depend strongly on the bias current of the broad-area laser diode. Operating the laser diode in an injection-locked regime above the lasing threshold gave phase conjugate reflectivities as high as 165%.

DOI
10.1063/1.115961

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Optical phase conjugation through nearly degenerate four-wave mixing (NDFWM) in semiconductor lasers has attracted considerable attention in recent years since being first demonstrated by Nakajima and Frey[ 1 ]. Such interest arises due to the very high conjugate reflectivity of order 30-40dB which can be achieved owing to the amplifying effect of the semiconductor gain medium and cavity enhancement of mixing process. However, most previous experimental and theoretical work has placed emphasis on the weak signal case, where the injection signal acts only as a small perturbation of free-running laser diode. It is only very recently that a theoretical analysis of NDFWM in a semiconductor laser subject to strong probe injection power has been presented[2].

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Optics Letters•Sep 1, 2000•5 citations
We report spatially nondegenerate four-wave mixing in a broad-area laser diode that acts as a fast phase conjugate mirror with nanosecond response times and high efficiencies. Phase conjugate reflectivities were found to depend strongly on the bias current of the broad-area laser diode. Operating the laser diode in an injection-locked regime above the lasing threshold gave phase conjugate reflectivities as high as 165%.
Summary form only given. Optical phase conjugation through nearly degenerate four-wave mixing (NDFWM) in semiconductor lasers has attracted considerable attention since being first demonstrated by Nakajima and Frey (1985). Such interest arises due to the very high conjugate reflectivity of order 30-40 dB which can be achieved owing to the amplifying effect of the semiconductor gain medium and cavity enhancement of the mixing process. The paper is focused on an experimental study of NDFWM in a two-section single cavity Fabry-Perot (TSSC FP) laser diode for different probe injection powers. We present results on the conjugate reflectivity dependence of the frequency detuning subject to different injection power. It is shown that the conjugate reflectivity is dependent on optical probe injection into either section of a TSSC FP laser diode, injection power and bias current condition.
Nearly degenerate four-wave mixing in two-section single-mode laser diodes with unequal (asymmetric) facet reflectivities is studied theoretically. It is demonstrated that, under appropriate biasing conditions, the device exhibits a uniform phase-conjugate reflectivity over a frequency detuning range of more than 10 GHz. We can simultaneously achieve enhancement of the four-wave-mixing bandwidth and efficiency by injecting the probe signal at and deriving the conjugate output from the low-reflectivity facet of an asymmetric two-section laser diode.
Optical phase conjugation through nearly degenerate four-wave mixing (NDFWM) in semiconductor lasers has attracted considerable attention in recent years since being first demonstrated by Nakajima and Frey[ 1 ]. Such interest arises due to the very high conjugate reflectivity of order 30-40dB which can be achieved owing to the amplifying effect of the semiconductor gain medium and cavity enhancement of mixing process. However, most previous experimental and theoretical work has placed emphasis on the weak signal case, where the injection signal acts only as a small perturbation of free-running laser diode. It is only very recently that a theoretical analysis of NDFWM in a semiconductor laser subject to strong probe injection power has been presented[2].