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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 22 — Oct. 29, 2007
  • pp: 14704–14710

Period-doubling and total mode-locking, and chaotic pulsations in a GaAs ridge wave-guide external-cavity diode laser

Tai Hyun Yoon and Gwang Hoon Jang  »View Author Affiliations

Optics Express, Vol. 15, Issue 22, pp. 14704-14710 (2007)

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We report on the experimental observations of a period-doubling route to chaos and a total mode-locking between two lowest-order lateral modes of a GaAs ridge wave-guide diode laser at 795 nm. A self-starting passively mode-locking was achieved in an extended-cavity diode laser (ECDL) operating in a gain saturation regime. In the period-doubling mode-locked state, the RF spectra associated with the coherently coupled lateral TE0 and TE1 modes, consisted of harmonics (nfrep /2, n is an integer) of the half of pulse repetition rate frep /2 and the period (2T) of the pulse train was two-times longer than the pulse round-trip time T. On the other hand, in the total mode-locked state, the RF spectra and the pulse train corresponding to the TE0 and TE1 modes had exactly the same features compared to those of the period-doubling mode-locked state, except the RF spectra and the pulse train of the TE1 mode were shifted by fref /4 in frequency and by T in time, respectively, indicating the pulses actually traveled alternatively through two lateral modes. The total mode-locking and also chaotic pulsations were observed at slightly different operation parameters, e.g. at different feedback angle of the grating, which was used as an output coupler of the ECDL.

© 2007 Optical Society of America

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(190.3100) Nonlinear optics : Instabilities and chaos

ToC Category:
Lasers and Laser Optics

Original Manuscript: August 20, 2007
Revised Manuscript: October 10, 2007
Manuscript Accepted: October 15, 2007
Published: October 24, 2007

Tai Hyun Yoon and Gwang Hoon Jang, "Period-doubling and total mode-locking, and chaotic pulsations in a GaAs ridge wave-guide external-cavity diode laser," Opt. Express 15, 14704-14710 (2007)

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