Room temperature single-mode terahertz sources based on intracavity difference-frequency generation in quantum cascade lasers

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

We demonstrate room temperature single-mode THz emission at 4 THz based on intracavity difference-frequency generation from mid-infrared dual-wavelength quantum cascade lasers. An integrated dual-period distributed feedback grating is defined on the cap layer to purify both mid-infrared pumping wavelengths and in turn the THz spectra. Single mode operation of the pumping wavelengths results in a single-mode THz operation with a narrow linewidth of 6.6 GHz. A maximum THz power of 8.5 μW with a power conversion efficiency of 10 μW/W2 is obtained at room temperature.

Original languageEnglish (US)
Article number131106
JournalApplied Physics Letters
Volume99
Issue number13
DOIs
StatePublished - Sep 26 2011

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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