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

作者：Friederich Fabian^*; Schuricht Gunter; Deninger Anselm; Lison Frank; Spickermann Gunnar; Bolivar Peter Haring; Roskos Hartmut G

来源：Optics Express, 2010, 18(8): 8621-8629.

DOI：10.1364/OE.18.008621

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.

• 出版日期2010-4-12