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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 7 — Mar. 26, 2012
  • pp: 7040–7045

175 GHz, 400-fs-pulse harmonically mode-locked surface emitting semiconductor laser.

Keith G. Wilcox, Adrian H. Quarterman, Vasilis Apostolopoulos, Harvey E. Beere, Ian Farrer, David A. Ritchie, and Anne C. Tropper  »View Author Affiliations

Optics Express, Vol. 20, Issue 7, pp. 7040-7045 (2012)

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We report a harmonically mode-locked vertical external cavity surface emitting laser (VECSEL) producing 400 fs pulses at a repetition frequency of 175 GHz with an average output power of 300 mW. Harmonic mode-locking was established using a 300 µm thick intracavity single crystal diamond heat spreader in thermal contact with the front surface of the gain sample using liquid capillary bonding. The repetition frequency was set by the diamond microcavity and stable harmonic mode locking was achieved when the laser cavity length was tuned so that the laser operated on the 117th harmonic of the fundamental cavity. When an etalon placed intracavity next to the gain sample, but not in thermal contact was used pulse groups were observed. These contained 300 fs pulses with a spacing of 5.9 ps. We conclude that to achieve stable harmonic mode locking at repetition frequencies in the 100s of GHz range in a VECSEL there is a threshold pulse energy above which harmonic mode locking is achieved and below which groups of pulses are observed.

© 2012 OSA

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(140.7090) Lasers and laser optics : Ultrafast lasers

ToC Category:
Ultrafast Optics

Original Manuscript: November 28, 2011
Revised Manuscript: January 31, 2012
Manuscript Accepted: January 31, 2012
Published: March 13, 2012

Virtual Issues
Vol. 7, Iss. 5 Virtual Journal for Biomedical Optics
Modular Ultrafast Lasers (Invited Only) (2012) Optics Express

Keith G. Wilcox, Adrian H. Quarterman, Vasilis Apostolopoulos, Harvey E. Beere, Ian Farrer, David A. Ritchie, and Anne C. Tropper, "175 GHz, 400-fs-pulse harmonically mode-locked surface emitting semiconductor laser.," Opt. Express 20, 7040-7045 (2012)

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