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Passive Mode Locking of Lasers by Crossed-Polarization Gain Modulation

AuthorsJavaloyes, Julien ; Mulet, Josep; Balle, Salvador
Keywords[PACS] Laser beam modulation, tuning, and mode locking
[PACS] Semiconductor lasers; laser diodes
[PACS] Dynamics of nonlinear optical systems including optical instabilities, optical chaos and complexity, and optical spatio–temporal dynamics
Issue Date16-Oct-2006
PublisherAmerican Physical Society
CitationPhysical Review Letters 97, 163902 (2006)
AbstractWe report on a novel approach for inducing passive mode locking of lasers without using any saturable absorber but exploiting the polarization degree of freedom of light. In our scheme, passive mode locking is achieved by crossed-polarization gain modulation caused by the reinjection of a polarization-rotated replica of the laser output after a time delay. The reinjection time delay defines resonance tongues that correspond to mode-locking operation. Numerical continuation reveals that the cw solution is destabilized through a Hopf bifurcation that defines the onset of multimode operation which evolves sharply into a mode-locked solution. Our approach can be applied to a large variety of laser systems. For vertical-cavity surface-emitting lasers, we demonstrate stable mode-locked pulses at repetition rates in the GHz range and pulse widths of few tens of picoseconds.
Description4 pages.-- PACS numbers: 42.60.Fc, 42.55.Px, 42.65.Sf.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.97.163902
Appears in Collections:(IFISC) Artículos
(IMEDEA) Artículos
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