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Laser diode structures with a saturable absorber for high-energy picosecond optical pulse generation by combined gain-and Q-switching

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JournalSemiconductor science and technology
DateAccepted/In press - 9 Nov 2016
DatePublished (current) - 19 Jan 2017
Issue number2
Volume32
Number of pages8
Original languageEnglish

Abstract

The performance of gain-switched Fabry-Perot asymmetric-waveguide semiconductor lasers with a large equivalent spot size and an intracavity saturable absorber was investigated experimentally and theoretically. The laser with a short (∼20 μm) absorber emitted high-energy afterpulse-free optical pulses in a broad range of injection current pulse amplitudes; optical pulses with a peak power of about 35 W and a duration of about 80 ps at half maximum were achieved with a current pulse with an amplitude of just 8 A and a duration of 1.5 ns. Good quality pulsations were observed in a broad range of elevated temperatures. The introduction of a substantially longer absorber section leads to strong spectral broadening of the output without a significant improvement to pulse energy and peak power.

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© 2017 IOP Publishing Ltd . This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

    Research areas

  • gain switching, optical radars, semiconductor lasers

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