Absence of relaxation oscillation in quantum cascade lasers verified by high-frequency modulation

R. Martini, R. Paiella, F. Capasso, C. Gmachl, H. Y. Hwang, D. L. Sivco, A. Y. Cho, E. A. Whittaker, H. C. Liu

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations


The characteristic absence of relaxation oscillations in quantum cascade lasers (QCL) was investigated by high-frequency modulation. Frequency modulation measurements were performed on QCL with emission wavelengths around 8 μm. The parasitic effects were reduced using high-speed packaging and processing. The modulation response was measured and corrected for frequency response. The digital modulation properties of these devices was also tested in a standard bit error rate measurement. No sign of relaxation oscillations were observed over a wide range of direct current bias including values approaching the continuous wave threshold. The results indicated high applicability of these devices for high speed data sources.

Original languageEnglish (US)
StatePublished - 2001
Externally publishedYes
EventConference on Lasers and Electro-Optics (CLEO) - Baltimore, MD, United States
Duration: May 6 2001May 11 2001


OtherConference on Lasers and Electro-Optics (CLEO)
Country/TerritoryUnited States
CityBaltimore, MD

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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