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International Conference Laser Optics (ICLO)

Experimental observation of rogue-waves in a system of dissipative self-induced transparency solitons in a Ti:sapphire laser

Rostislav M. Arkhipov, Mikhail V. Arkhipov, A. A. Shimko, Ihar Babushkin, Ayhan Demircan, Uwe Morgner, Nikolay N. Rosanov

Published Nov 2, 2020• 0 citations
Publisher

Abstract

This work reports the observation of rogue waves in a Ti: sapphire laser containing a coherent absorber cell with Rb and Cs vapors. Extreme events were observed with an interval of one to ten seconds when several dissipative self-induced transparency solitons could be simultaneously present in the cavity. An extremely rare event was the fusion of solitons into one.

DOI
10.1109/iclo48556.2020.9309148

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This work reports the observation of rogue waves in a Ti: sapphire laser containing a coherent absorber cell with Rb and Cs vapors. Extreme events were observed with an interval of one to ten seconds when several dissipative self-induced transparency solitons could be simultaneously present in the cavity. An extremely rare event was the fusion of solitons into one.
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.
Abstract We propose a scheme that excites rogue waves via electromagnetically induced transparency (EIT), which can also excite breathers and solitons. The system is a resonant Λ-type atomic ensemble. Under EIT conditions, the envelope equation of the probe field can be reduced to several different models, such as the saturable nonlinear Schrödinger equation (SNLSE), and SNLSE with the trapping potential provided by a far-detuned laser field or a magnetic field. In this scheme, rogue waves can be generated by different initial pulses, such as the Gaussian wave with (or without) the uniform background. The scheme can be used to obtain rogue waves, breathers and solitons. We show the existence regions of rogue waves, breathers, and solitons as the function of the amplitude and width of the initial pulse. The novelty of our paper is that, we not only show rogue waves in the integrable system numerically, but also present the method to generate and control rogue waves in the non-integrable system.