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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 2 — Jan. 15, 2009
  • pp: 208–210

Intersubband gain-induced dispersion

Wolfgang Parz, Thomas Müller, Juraj Darmo, Maximilian Austerer, Gottfried Strasser, Luke Wilson, John Cockburn, Andrey Krysa, John Roberts, and Karl Unterrainer  »View Author Affiliations


Optics Letters, Vol. 34, Issue 2, pp. 208-210 (2009)
http://dx.doi.org/10.1364/OL.34.000208


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Abstract

Time-resolved transmission spectroscopy of a mid-infrared quantum cascade laser emitting at 11.7 μ m allows us to iteratively retrieve the effective refractive index and the extinction coefficient of the gain medium in a broad spectral range with an accuracy of ± 7 × 10 3 . Besides a 3% slowdown of the group velocity we find a large induced group-velocity dispersion with changing signs in the vicinity of the gain maximum, disclosing implications for self-pulse formation in quantum-cascade lasers. Additionally we measured the temperature in the active region by exploiting the thermo-optic effect. A linear behavior with respect to the current and the duty cycle was observed.

© 2009 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.6810) Lasers and laser optics : Thermal effects
(260.2030) Physical optics : Dispersion
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: September 26, 2008
Manuscript Accepted: November 21, 2008
Published: January 14, 2009

Citation
Wolfgang Parz, Thomas Müller, Juraj Darmo, Maximilian Austerer, Gottfried Strasser, Luke Wilson, John Cockburn, Andrey Krysa, John Roberts, and Karl Unterrainer, "Intersubband gain-induced dispersion," Opt. Lett. 34, 208-210 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-2-208


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