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, Theodore B. Norris

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


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/dω2) 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.

Original languageEnglish
Pages (from-to)15898-15907
Number of pages10
JournalOptics Express
Issue number24
Publication statusPublished - 2007 Nov 26

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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