Continuous operation of a monolithic semiconductor terahertz source at room temperature

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

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


We demonstrate room temperature continuous wave THz sources based on intracavity difference-frequency generation from mid-infrared quantum cascade lasers. Buried ridge, buried composite distributed-feedback waveguide with Čerenkov phase-matching scheme is used to reduce the waveguide loss and enhance the heat dissipation for continuous wave operation. Continuous emission at 3.6 THz with a side-mode suppression ratio of 20 dB and output power up to 3μW are achieved, respectively. THz peak power is further scaled up to 1.4 mW in pulsed mode by increasing the mid-infrared power through increasing the active region doping and device area.

Original languageEnglish (US)
Article number221105
JournalApplied Physics Letters
Issue number22
StatePublished - Jun 2 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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