Current pulse investigation toward optimal pumping of  a gain-switched asymmetric waveguide laser diode

Brigitte Lanz; Juha T. Kostamovaara

doi:10.1117/12.2050238

9 June 2014 Current pulse investigation toward optimal pumping of a gain-switched asymmetric waveguide laser diode

Brigitte Lanz, Juha T. Kostamovaara

Proceedings Volume 9081, Laser Technology for Defense and Security X; 90810W (2014) https://doi.org/10.1117/12.2050238
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

Optical transient responses to a variety of pump-current pulses, modified in length and amplitude, are experimentally investigated under room temperature conditions for a Fabry-Perot semiconductor bulk laser with an 80 nm thick active layer (AL) comprised in a strongly asymmetric broadened waveguide structure. At best, gain-switched trailing oscillations free single optical pulses with ~2.48 nJ pulse energy, E_opt, and ~130 ps full width at half maximum (FWHM), equivalent to ~13 W peak power were achieved. The corresponding pump-current pulse was of ~6.9 A amplitude and ~1.26 ns FWHM generated with a compact driver circuit of ~1 cm² in size utilizing a commercial silicon avalanche transistor as an electrical switch. We found that the laser pulse temporal position correlates with a critical charge, Q^crit, arising from the current pulse, which scales with the laser diode oxide stripe width (90 μm) and cavity length (1.5 mm).

Citation Download Citation

Brigitte Lanz and Juha T. Kostamovaara "Current pulse investigation toward optimal pumping of a gain-switched asymmetric waveguide laser diode", Proc. SPIE 9081, Laser Technology for Defense and Security X, 90810W (9 June 2014); https://doi.org/10.1117/12.2050238

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