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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 3302–3310

Transient behaviors of current-injection quantum-dot microdisk lasers

Ming-Hua Mao and Hao-Che Chien  »View Author Affiliations

Optics Express, Vol. 20, Issue 3, pp. 3302-3310 (2012)

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We studied the transient behaviors of current-injection quantum-dot microdisk lasers at room temperature. Unique optical responses were observed, including the suppression of relaxation oscillations and fast turn-on. With the help of rate-equation modeling, the suppressed relaxation oscillations are attributed to the enhanced spontaneous emission factor in microdisk lasers. Short turn-on time, around 1 ns without pre-bias, results from the reduced carrier lifetime caused by the Purcell effect and increased nonradiative recombination rate due to higher surface/volume ratio. With short turn-on time, a large-signal direct modulation experiment at 1 Gbps is demonstrated. Modal transient behavior was also investigated under various temperatures from 100 to 300 K. Both of the transient lasing and steady-state lasing from side modes are suppressed at temperatures higher than 250K. Therefore, the quantum-dot microdisk lasers show the potential of single-mode operation under high-speed modulation at room temperature.

© 2012 OSA

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 22, 2011
Revised Manuscript: January 24, 2012
Manuscript Accepted: January 25, 2012
Published: January 27, 2012

Ming-Hua Mao and Hao-Che Chien, "Transient behaviors of current-injection quantum-dot microdisk lasers," Opt. Express 20, 3302-3310 (2012)

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