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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 25 — Dec. 3, 2012
  • pp: 27908–27914

2.32 THz quantum cascade laser frequency-locked to the harmonic of a microwave synthesizer source

Andriy A. Danylov, Alexander R. Light, Jerry Waldman, Neal R. Erickson, Xifeng Qian, and William D. Goodhue  »View Author Affiliations

Optics Express, Vol. 20, Issue 25, pp. 27908-27914 (2012)

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Frequency stabilization of a THz quantum cascade laser (QCL) to the harmonic of a microwave source has been accomplished using a Schottky diode waveguide mixer designed for harmonic mixing. The 2.32 THz, 1.0 milliwatt CW QCL is coupled into the signal port of the mixer and a 110 GHz signal, derived from a harmonic of a microwave synthesizer, is coupled into the IF port. The difference frequency between the 21st harmonic of 110 GHz and the QCL is used in a discriminator to adjust the QCL bias current to stabilize the frequency. The short-term frequency jitter is reduced from 550 kHz to 4.5 kHz (FWHM) and the long-term frequency drift is eliminated. This performance is compared to that of several other THz QCL frequency stabilization techniques.

© 2012 OSA

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(300.3700) Spectroscopy : Linewidth
(140.3425) Lasers and laser optics : Laser stabilization
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

Original Manuscript: October 15, 2012
Revised Manuscript: November 18, 2012
Manuscript Accepted: November 19, 2012
Published: November 29, 2012

Andriy A. Danylov, Alexander R. Light, Jerry Waldman, Neal R. Erickson, Xifeng Qian, and William D. Goodhue, "2.32 THz quantum cascade laser frequency-locked to the harmonic of a microwave synthesizer source," Opt. Express 20, 27908-27914 (2012)

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