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Conference on Lasers and Electro-Optics

Intracavity self-generated 2π pulses and coherent population trapping in a mode-locked laser

Koji Masuda, Ladan Arissian, Jean‐Claude Diels

Published Jan 1, 2012• 0 citations
Publisher

Abstract

2π pulse self-induced transparency in rubidium is reported for the first time inside a mode-locked laser cavity. Simultaneous occurrence of a dark line repetition rate resonance is observed in the 87Rb vapor cell.
DOI
10.1364/cleo_si.2012.cf3l.6

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In self-induced-transparency (SIT) mode locking, 2\ensuremath{\pi} SIT solitons with a duration much smaller than the polarization relaxation time T2{T}_{2}T2​ in the gain and absorber are formed in a laser cavity. This is in contrast to standard passive mode-locking schemes based on gain and absorption saturation. Despite the great promise, up to now SIT mode locking with 2\ensuremath{\pi} pulses was mainly studied theoretically. In this paper, a stable self-starting passive mode locking is demonstrated experimentally in a Ti:sapphire laser with a Rb vapor cell. We show that the mode locking indeed appears to be due to SIT in the Rb cell; that is, the pulse in the Rb cell is a 2\ensuremath{\pi} SIT soliton. We also confirm self-starting of the SIT mode locking. Self-starting takes place via a set of intermediate regimes, including the one containing zero-area pulses.
The regime of passive mode locking in a Ti:sapphire laser with a coherent absorber resulting in the emission of pulses with a duration considerably shorter than the absorber relaxation times is demonstrated experimentally. A cell filled with rubidium vapor placed in the laser cavity serves as a coherent absorber. Mode locking arises when the laser oscillation frequency is tuned to the resonance transitions in rubidium. In our opinion, 2π pulses of self-induced transparency appear in the cavity, and the reported results represent the first experimental demonstration of passive mode locking caused by the effect of self-induced transparency, which has previously been discussed only theoretically.