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

doi:10.1364/OE.15.015898

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

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

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/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 language	English
Pages (from-to)	15898-15907
Number of pages	10
Journal	Optics Express
Volume	15
Issue number	24
DOIs	https://doi.org/10.1364/OE.15.015898
Publication status	Published - 2007 Nov 26

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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title = "Time-domain upconversion measurements of group-velocity dispersion in quantum cascade lasers",

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/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.",

author = "Hyunyong Choi and Laurent Diehl and Federico Capasso and David Bour and Scott Corzine and Jintian Zhu and Gloria H{\"o}fler and Norris, {Theodore B.}",

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AU - Choi, Hyunyong

AU - Diehl, Laurent

AU - Capasso, Federico

AU - Bour, David

AU - Corzine, Scott

AU - Zhu, Jintian

AU - Höfler, Gloria

AU - Norris, Theodore B.

PY - 2007/11/26

Y1 - 2007/11/26

N2 - 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.

AB - 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.

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