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

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...

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Bibliographic Details
Published in:Optics express 2010-04, Vol.18 (8), p.8621-8629
Main Authors: Friederich, Fabian, Schuricht, Gunter, Deninger, Anselm, Lison, Frank, Spickermann, Gunnar, Haring Bolívar, Peter, Roskos, Hartmut G
Format: Article
Language:English
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.18.008621