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Proceedings Paper

Harmonic fundamental self-pulsations from a laser diode using phase-conjugate optical feedback
Author(s): Delphine Wolfersberger; A. Karsaklian dal Bosco; E. Mercier; M. Sciamanna
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Paper Abstract

Thanks to the band-gap engineering of quantum confined semiconductor materials and the development of semiconductor-based saturable absorber mirrors, recent years have seen the development of compact and low-cost external-cavity laser diodes generating pulses at several tens of GHz. The physics of the bifurcation leading to selfpulsation leads however to an intrinsic limitation: the fundamental repetition rate is fixed to and limited by the externalcavity round-trip time. By contrast, we demonstrate here that an external-cavity diode laser may generate fundamental self-pulsating dynamics at harmonics of the external-cavity frequency, when a phase conjugate mirror replaces the conventional mirror. As is known from theory, a laser diode with phase conjugate external feedback supports a single stationary solution that bifurcates to self-pulsating dynamics of increasing frequency when increasing the amount of light reflected back to the laser diode. The self-pulsation frequency then increases in step of the external-cavity frequency as one increases the feedback strength. We provide here the first experimental evidence of such harmonic external-cavity fundamental self-pulsation. As a proof-of-concept, we generate experimentally a self-pulsating dynamics at twice and three times the fundamental external-cavity frequency using an edge-emitting laser with a self-pumped ring-cavity photorefractive phase conjugator. Numerical simulations also predict stable higher harmonics.

Paper Details

Date Published: 2 May 2014
PDF: 6 pages
Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 91340K (2 May 2014); doi: 10.1117/12.2052302
Show Author Affiliations
Delphine Wolfersberger, Supélec (France)
A. Karsaklian dal Bosco, Supélec (France)
E. Mercier, Supélec (France)
M. Sciamanna, Supélec (France)

Published in SPIE Proceedings Vol. 9134:
Semiconductor Lasers and Laser Dynamics VI
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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