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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 8 — Apr. 12, 2010
  • pp: 8621–8629

Phase-locking of the beat signal of two distributed-feedback diode lasers to oscillators working in the MHz to THz range

Fabian Friederich, Gunter Schuricht, Anselm Deninger, Frank Lison, Gunnar Spickermann, Peter Haring Bolívar, and Hartmut G. Roskos  »View Author Affiliations


Optics Express, Vol. 18, Issue 8, pp. 8621-8629 (2010)
http://dx.doi.org/10.1364/OE.18.008621


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Abstract

We present difference-frequency stabilization of free-running distributed-feedback (DFB) diode lasers, maintaining a stable phase-lock to a local oscillator (LO) signal. The technique has been applied to coherent hybrid THz imaging which employs a high-power electronic radiation source emitting at 0.62 THz and electro-optic detectors. The THz radiation of the narrow-band emitter is mixed with the difference frequency of the DFB diode laser pair. The resulting intermediate frequency is phase-locked to the LO signal from a radio-frequency generator using a fast laser-current control loop. The stabilization scheme can be adapted readily to a wide range of applications which require stabilized laser beat-notes.

© 2010 Optical Society of America

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(040.2235) Detectors : Far infrared or terahertz
(140.3425) Lasers and laser optics : Laser stabilization
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 13, 2010
Revised Manuscript: March 8, 2010
Manuscript Accepted: March 9, 2010
Published: April 9, 2010

Citation
Fabian Friederich, Gunter Schuricht, Anselm Deninger, Frank Lison, Gunnar Spickermann, Peter Haring Bolívar, and Hartmut G. Roskos, "Phase-locking of the beat signal of two distributed-feedback diode lasers to oscillators working in the MHz to THz range," Opt. Express 18, 8621-8629 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-8-8621


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