Widely tuned room temperature terahertz quantum cascade laser sources based on difference-frequency generation

Q. Y. Lu*, N. Bandyopadhyay, S. Slivken, Y. Bai, M. Razeghi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We demonstrate room temperature THz quantum cascade laser sources with a broad spectral coverage based on intracavity difference-frequency generation. Two mid-infrared active cores based on the single-phonon resonance scheme are designed with a THz nonlinearity specially optimized at the high operating fields that correspond to the highest mid-infrared output powers. A Čerenkov phase-matching scheme along with integrated dual-period distributed feedback gratings are used for efficient THz extraction and spectral purification. Single mode emissions from 1.0 to 4.6 THz with a side-mode suppression ratio and output power up to 40 dB and 32 μW are obtained, respectively.

Original languageEnglish (US)
Article number251121
JournalApplied Physics Letters
Volume101
Issue number25
DOIs
StatePublished - Dec 17 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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