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Femtosecond pulse generation from a two-section mode-locked quantum-dot laser using random population

Belyanin, Alexey A., Blood, Peter, Finch, P., Smowton, Peter Michael, Sobiesierski, Angela, Gwilliam, R. M. and O'Driscoll, I. 2014. Femtosecond pulse generation from a two-section mode-locked quantum-dot laser using random population. Presented at: Novel In-Plane Semiconductor Lasers XIII, San Francisco, 3 February 2014 through 6 February 2014. Proceedings of SPIE - The International Society for Optical Engineering. SPIE, 90020E. 10.1117/12.2039130

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Abstract

290 fs optical pulses have been demonstrated using a two-section, passively mode-locked InAs quantum dot laser with a proton bombarded absorber, at a repetition rate of 20 GHz, centred around 1220 nm. Optical pulsewidth measurements between 300 K and 20 K, reveal that the pulsewidth decreases by a factor of 29, from 8.4 ps at 250 K to 290 fs at 20 K with a corresponding change in optical bandwidth. Rate equation analysis shows that this is due to the decreased emission rate compared to the recombination rate at 20 K in the random population regime. Random population ensures the dots act as independent oscillators across the entire inhomogeneous distribution thereby allowing access to the full gain spectrum. Proton bombardment of the absorber section shortens the recovery time of the absorber while the dots remain randomly populated.

Item Type: Conference or Workshop Item (Paper)
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Electromagnetic pulse; Locks (fasteners); Passive mode locking; Protons; Pulse generators; Quantum dot lasers; Semiconductor lasers; Semiconductor quantum dots; Ultrashort pulses
Publisher: SPIE
ISSN: 0277-786X
Last Modified: 26 Dec 2017 20:20
URI: http://orca.cf.ac.uk/id/eprint/85833

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