Low-frequency fluctuations in a laser diode with phase-conjugate feedback

Andreas Karsaklian Dal Bosco; Delphine Wolfersberger; Marc Sciamanna

doi:10.1117/12.922613

10 May 2012 Low-frequency fluctuations in a laser diode with phase-conjugate feedback

Andreas Karsaklian Dal Bosco, Delphine Wolfersberger, Marc Sciamanna

Proceedings Volume 8432, Semiconductor Lasers and Laser Dynamics V; 843213 (2012) https://doi.org/10.1117/12.922613
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

Optical chaos is easily observed in a laser diode with either conventional (COF) or phase-conjugate optical feedback (PCF). We focus here on the so-called chaotic low-frequency fluctuations (LFF) where the laser exhibits slow power dropouts together with fast picosecond dynamics. We report here on a systematic study of LFF in a laser diode when subjected to PCF for which the bifurcations leading to those LFF remain to be elucidated. Qualitatively different dynamics are observed when increasing the phase-conjugate mirror (PCM) reflectivity or the injection current level. A combination of spectral and temporal measurements unveils the transition to LFF dynamics. The statistical properties of the time between power dropouts -mean dropout time and standard deviation- are studied as a function of the laser and feedback parameters and show that the laser may undergo what we call here a deterministic coherence resonance for a particular value of the PCF ratio. Interestingly, the phase conjugation build-up time here in SPS crystal is around 3 ms, hence is three orders of magnitude faster than what has been reported in previous dynamical studies of chaos in lasers with PCF using BaTiO₃ photorefractive crystals. How the phase conjugation time-scale impacts on the laser dynamics remains an interesting question to which we contribute here.

Citation Download Citation

Andreas Karsaklian Dal Bosco, Delphine Wolfersberger, and Marc Sciamanna "Low-frequency fluctuations in a laser diode with phase-conjugate feedback", Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 843213 (10 May 2012); https://doi.org/10.1117/12.922613

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