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Proceedings Paper

169 GHz repetition rate passively harmonically mode-locked VECSEL emitting 265 fs pulses
Author(s): Adrian H. Quarterman; Keith G. Wilcox; Alex Perevedentsev; Vasilis Apostolopoulos; Zakaria Mihoubi; Aaron L. Chung; Harvey E. Beere; Ian Farrer; David A. Ritchie; Anne C. Tropper
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Paper Abstract

High repetition rate passively mode-locked sources are of significant interest due to their potential for applications including optical clocking, optical sampling, communications and others. Due to their short excited state lifetimes mode-locked VECSELs are ideally suited to high repetition rate operation, however fundamentally mode-locked quantum well-based VECSELs have not achieved repetition rates above 10 GHz due to the limitations placed on the cavity geometry by the requirement that the saturable absorber saturates more quickly than the gain. This issue has been overcome by the use of quantum dot-based saturable absorbers with lower saturation fluences leading to repetition rates up to 50 GHz, but sub-picosecond pulses have not been achieved at these repetition rates. We present a passively harmonically mode-locked VECSEL emitting pulses of 265 fs duration at a repetition rate of 169 GHz with an output power of 20 mW. The laser is based around an antiresonant 6 quantum well gain sample and is mode-locked using a semiconductor saturable absorber mirror. Harmonic modelocking is achieved by using an intracavity sapphire etalon. The sapphire then acts as a coupled cavity, setting the repetition rate of the laser while still allowing a tight focus on the saturable absorber. RF spectra of the laser output show no peaks at harmonics of the fundamental repetition rate up to 26 GHz, indicating stable harmonic modelocking. Autocorrelations reveal groups of pulses circulating in the cavity as a result of an increased tendency towards Q-switched modelocking due to the low pulse energies.

Paper Details

Date Published: 21 February 2011
PDF: 7 pages
Proc. SPIE 7919, Vertical External Cavity Surface Emitting Lasers (VECSELs), 791910 (21 February 2011); doi: 10.1117/12.874573
Show Author Affiliations
Adrian H. Quarterman, Univ. of Southampton (United Kingdom)
Keith G. Wilcox, Univ. of Southampton (United Kingdom)
Alex Perevedentsev, Univ. of Southampton (United Kingdom)
Vasilis Apostolopoulos, Univ. of Southampton (United Kingdom)
Zakaria Mihoubi, Univ. of Southampton (United Kingdom)
Aaron L. Chung, Univ. of Southampton (United Kingdom)
Harvey E. Beere, Univ. of Cambridge (United Kingdom)
Ian Farrer, Univ. of Cambridge (United Kingdom)
David A. Ritchie, Univ. of Cambridge (United Kingdom)
Anne C. Tropper, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 7919:
Vertical External Cavity Surface Emitting Lasers (VECSELs)
Ursula Keller, Editor(s)

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