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Proceedings Paper

Current pulse investigation toward optimal pumping of a gain-switched asymmetric waveguide laser diode
Author(s): Brigitte Lanz; Juha T. Kostamovaara
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Paper 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, Eopt, 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, Qcrit, arising from the current pulse, which scales with the laser diode oxide stripe width (90 μm) and cavity length (1.5 mm).

Paper Details

Date Published: 9 June 2014
PDF: 10 pages
Proc. SPIE 9081, Laser Technology for Defense and Security X, 90810W (9 June 2014); doi: 10.1117/12.2050238
Show Author Affiliations
Brigitte Lanz, Univ. of Oulu (Finland)
Juha T. Kostamovaara, Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 9081:
Laser Technology for Defense and Security X
Mark Dubinskii; Stephen G. Post, Editor(s)

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