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169 GHz repetition rate passively harmonically mode-locked VECSEL emitting 265 fs pulses

169 GHz repetition rate passively harmonically mode-locked VECSEL emitting 265 fs pulses
169 GHz repetition rate passively harmonically mode-locked VECSEL emitting 265 fs pulses
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.
SPIE
Quarterman, A.H.
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Wilcox, K.G.
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Perevedentsev, A.
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Apostolopoulos, V.
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Mihoubi, Z.
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Chung, A.L.
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Beere, H.E.
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Farrer, I.
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Ritchie, D.A.
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Tropper, A.C.
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Keller, Ursula
Quarterman, A.H.
1d59a842-c64f-4274-a808-17b7700fe20c
Wilcox, K.G.
b7c8da76-3530-4cbf-aaec-ffa11c347230
Perevedentsev, A.
f53c9510-6f19-4853-9ea9-84d42ad54fd4
Apostolopoulos, V.
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Mihoubi, Z.
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Chung, A.L.
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Beere, H.E.
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Farrer, I.
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Ritchie, D.A.
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Tropper, A.C.
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Keller, Ursula

Quarterman, A.H., Wilcox, K.G., Perevedentsev, A., Apostolopoulos, V., Mihoubi, Z., Chung, A.L., Beere, H.E., Farrer, I., Ritchie, D.A. and Tropper, A.C. (2011) 169 GHz repetition rate passively harmonically mode-locked VECSEL emitting 265 fs pulses. Keller, Ursula (ed.) In Vertical External Cavity Surface Emitting Lasers (VECSELs). SPIE.. (doi:10.1117/12.874573).

Record type: Conference or Workshop Item (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.

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More information

Published date: 2011
Venue - Dates: Conference on Vertical External Cavity Surface Emitting Lasers (VECSELs), , San Francisco, CA, United States, 2011-01-24 - 2011-01-25

Identifiers

Local EPrints ID: 443671
URI: http://eprints.soton.ac.uk/id/eprint/443671
PURE UUID: 333ccd21-4cc0-4d56-9c30-f0f889fbcd31
ORCID for V. Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

Catalogue record

Date deposited: 08 Sep 2020 16:31
Last modified: 18 Feb 2021 17:10

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Contributors

Author: A.H. Quarterman
Author: K.G. Wilcox
Author: A. Perevedentsev
Author: Z. Mihoubi
Author: A.L. Chung
Author: H.E. Beere
Author: I. Farrer
Author: D.A. Ritchie
Author: A.C. Tropper
Editor: Ursula Keller

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