Self Q-switching and mode locking in broad area lasers subject to transverse mode selective feedback

Christoph Doering; Sandra Wolff; Andrey Rodionov; Vladimir E. Sherstobitov; Dehua Xiao; Henning Fouckhardt

doi:10.1117/12.662799

14 April 2006 Self Q-switching and mode-locking in broad area lasers subject to transverse mode selective feedback

Christoph Doering, Sandra Wolff, Andrey Rodionov, Vladimir E. Sherstobitov, Dehua Xiao, Henning Fouckhardt

Proceedings Volume 6184, Semiconductor Lasers and Laser Dynamics II; 61841U (2006) https://doi.org/10.1117/12.662799
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

Numerical and experimental results of output dynamics investigations of AR-coated broad area lasers (BALs) above laser threshold are presented. The BALs are subject to feedback from a free-space external Fourier-optical 4f-setup with a spatial reflective filter in the Fourier-plane for transverse mode selection. It is shown theoretically and experimentally that under certain pump current conditions the BALs are operating in a repetitive self-pulsation mode. Pulse duration is approx. 1 ns at repetition rates of 200 to 500 MHz. Using the same setup active mode-locking of a BAL is achieved experimentally. Pulse durations of 103 ps are obtained. The Gaussian-like fundamental and higher order transverse modes up to mode No. 4 can be adjusted while the laser is operating in a mode-locked state. Experimentally, the simultaneous combination of mode-locking, transverse mode selection, and pulse shaping of a BAL in a modified 4f-setup implementing a spectral filter is investigated. Employing an optimized spectral sinc-like function as amplitude and phase filter the mode-locked BAL emits nearly square-shaped pulses with a pulse duration of 705 ps, while running close to the Gaussian-like transverse mode.

Citation Download Citation

Christoph Doering, Sandra Wolff, Andrey Rodionov, Vladimir E. Sherstobitov, Dehua Xiao, and Henning Fouckhardt "Self Q-switching and mode-locking in broad area lasers subject to transverse mode selective feedback", Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61841U (14 April 2006); https://doi.org/10.1117/12.662799

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