Narrow linewidth single-frequency terahertz source based on difference frequency generation of vertical-external-cavity source-emitting lasers in an external resonance cavity

Justin R. Paul, Maik A Scheller, Alexandre Laurain, Abram Young, Stephan W Koch, Jerome V Moloney

Research output: Contribution to journalArticle

23 Scopus citations


We demonstrate a continuous wave, single-frequency terahertz (THz) source emitting 1.9 THz. The linewidth is less than 100 kHz and the generated THz output power exceeds 100 μW. The THz source is based on parametric difference frequency generation within a nonlinear crystal located in an optical enhancement cavity. Two single-frequency vertical-external-cavity source-emitting lasers with emission wavelengths spaced by 6.8 nm are phase locked to the external cavity and provide pump photons for the nonlinear downconversion. It is demonstrated that the THz source can be used as a local oscillator to drive a receiver used in astronomy applications.

Original languageEnglish (US)
Pages (from-to)3654-3657
Number of pages4
JournalOptics Letters
Issue number18
Publication statusPublished - Sep 15 2013


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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