Journal
OPTICS EXPRESS
Volume 18, Issue 8, Pages 8621-8629Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.008621
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Funding
- Torsten Loffler (SynView GmbH)
- Radiometer Physics GmbH
- Federal Ministry of Education and Research Germany (BMBF) [16SV2304]
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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. (C) 2010 Optical Society of America
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