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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 24 — Nov. 26, 2007
  • pp: 15898–15907

Time-domain upconversion measurements of group-velocity dispersion in quantum cascade lasers

Hyunyong Choi, Laurent Diehl, Federico Capasso, David Bour, Scott Corzine, Jintian Zhu, Gloria Höfler, and Theodore B. Norris  »View Author Affiliations


Optics Express, Vol. 15, Issue 24, pp. 15898-15907 (2007)
http://dx.doi.org/10.1364/OE.15.015898


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Abstract

A time-resolved mid-infrared upconversion technique based on sum-frequency generation was applied to measure pulse propagation in λ~5.0 µm quantum cascade lasers operated in continuous wave at 30 K. The wavelength-dependent propagation delay of femtosecond mid-infrared pulses was measured to determine the total group-velocity dispersion. The material and waveguide dispersion were calculated and their contributions to the total group-velocity dispersion were found to be relatively small and constant. The small-signal gain dispersion was estimated from a measurement of the electroluminescence spectrum without a laser cavity, and was found to be the largest component of the total GVD. A negative group-velocity dispersion of β2 (=d2β/2) approximately -4.6×10-6 ps2/µm was observed at the peak emission wavelength, and good agreement was found for the measured and calculated pulse-broadening.

© 2007 Optical Society of America

OCIS Codes
(320.7100) Ultrafast optics : Ultrafast measurements
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: October 18, 2007
Revised Manuscript: November 13, 2007
Manuscript Accepted: November 13, 2007
Published: November 15, 2007

Citation
Hyunyong Choi, Laurent Diehl, Federico Capasso, David Bour, Scott Corzine, Jintian Zhu, Gloria Hofler, and Theodore B. Norris, "Time-domain upconversion measurements of group-velocity dispersion in quantum cascade lasers," Opt. Express 15, 15898-15907 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-24-15898


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