Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations

Alessio Tierno, Neal Matthew Radwell, Thorsten Ackemann

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Self-sustained pulsations in the output of an InAs quantum dot laser diode in the MHz range are reported. The characteristics (shape, range, and frequency) are presented for the free-running laser and when optical feedback in the Littrow configuration is applied. Bistability in the light-current characteristics is observed for operating wavelengths smaller than the gain peak, but it is not present for wavelengths above the gain peak and for the free-running laser, except at elevated temperatures. The temporal evolution of the envelopes of the optical spectra is very different for operation below, around, and above the gain peak, which might be related to a change of phase-amplitude coupling across the gain maximum, in agreement with the expectation for a two-level system. The time scale and the bifurcation scenario, supported by an initial blueshift of the emission wavelength of each longitudinal mode in time-resolved optical spectra, suggests that these are optothermal pulsations similar to those reported in quantum well amplifiers [Phys. Rev. E 68, 036209 (2003)]. The mechanism of pulsation seems to be a destabilization of bistable states (due to saturable absorption in the beam wings) by a slow thermal change in the waveguiding properties.
Original languageEnglish
Article number043828
Number of pages10
JournalPhysical Review A
Volume84
DOIs
Publication statusPublished - 2011

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semiconductor lasers
quantum dots
low frequencies
optical spectrum
wavelengths
destabilization
wings
lasers
envelopes
amplifiers
quantum wells
output
configurations
temperature

Keywords

  • quantum-dot laser diodes
  • optothermal pulsations
  • optics

Cite this

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title = "Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations",
abstract = "Self-sustained pulsations in the output of an InAs quantum dot laser diode in the MHz range are reported. The characteristics (shape, range, and frequency) are presented for the free-running laser and when optical feedback in the Littrow configuration is applied. Bistability in the light-current characteristics is observed for operating wavelengths smaller than the gain peak, but it is not present for wavelengths above the gain peak and for the free-running laser, except at elevated temperatures. The temporal evolution of the envelopes of the optical spectra is very different for operation below, around, and above the gain peak, which might be related to a change of phase-amplitude coupling across the gain maximum, in agreement with the expectation for a two-level system. The time scale and the bifurcation scenario, supported by an initial blueshift of the emission wavelength of each longitudinal mode in time-resolved optical spectra, suggests that these are optothermal pulsations similar to those reported in quantum well amplifiers [Phys. Rev. E 68, 036209 (2003)]. The mechanism of pulsation seems to be a destabilization of bistable states (due to saturable absorption in the beam wings) by a slow thermal change in the waveguiding properties.",
keywords = "quantum-dot laser diodes , optothermal pulsations , optics",
author = "Alessio Tierno and Radwell, {Neal Matthew} and Thorsten Ackemann",
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journal = "Physical Review A - Atomic, Molecular, and Optical Physics",
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Low-frequency self-pulsing in single-section quantum-dot laser diodes and its relation to optothermal pulsations. / Tierno, Alessio; Radwell, Neal Matthew; Ackemann, Thorsten.

In: Physical Review A, Vol. 84, 043828, 2011.

Research output: Contribution to journalArticle

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AU - Tierno, Alessio

AU - Radwell, Neal Matthew

AU - Ackemann, Thorsten

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AB - Self-sustained pulsations in the output of an InAs quantum dot laser diode in the MHz range are reported. The characteristics (shape, range, and frequency) are presented for the free-running laser and when optical feedback in the Littrow configuration is applied. Bistability in the light-current characteristics is observed for operating wavelengths smaller than the gain peak, but it is not present for wavelengths above the gain peak and for the free-running laser, except at elevated temperatures. The temporal evolution of the envelopes of the optical spectra is very different for operation below, around, and above the gain peak, which might be related to a change of phase-amplitude coupling across the gain maximum, in agreement with the expectation for a two-level system. The time scale and the bifurcation scenario, supported by an initial blueshift of the emission wavelength of each longitudinal mode in time-resolved optical spectra, suggests that these are optothermal pulsations similar to those reported in quantum well amplifiers [Phys. Rev. E 68, 036209 (2003)]. The mechanism of pulsation seems to be a destabilization of bistable states (due to saturable absorption in the beam wings) by a slow thermal change in the waveguiding properties.

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