Phase-locking of a 2.7-THz quantum cascade laser

Details Phase-locking of a 2.7-THz quantum cascade laser Phase-locking of a 2.7-THz quantum cascade laser

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1236..173g&link_type=abstract

INTERNATIONAL CONFERENCE ON ADVANCED PHASE MEASUREMENT METHODS IN OPTICS AND IMAGING. AIP Conference Proceedings, Volume 1236,

Physics

Optics

Gas Lasers, Microwave Propagation, Interferometers, Harmonic Generation, Fourier Transform Spectra, Semiconductor Lasers, Laser Diodes, Electromagnetic Wave Propagation, Radiowave Propagation, Holographic Interferometry, Other Holographic Techniques, Frequency Conversion, Harmonic Generation, Including Higher-Order Harmonic Generation, Fourier Optics

Scientific paper

We successfully realized phase-locking of a 2.7-THz metal-metal waveguide quantum cascade laser (QCL) to a reference, which is generated from an external microwave signal by applying two stages of frequency multiplication. The reference is the 15th harmonic of a signal at 182 GHz, which is produced by a semiconductor superlattice nonlinear device. The signal at 182 GHz is generated by a multiplier-chain (×12) from a microwave synthesizer at ~15 GHz. Both QCL laser and reference radiations are coupled into a superconducting NbN hot electron bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. Spectral analysis of the beat signal confirms that the QCL is phase locked. This result is a crucial demonstration for a QCL used for local oscillator and opens the possibility to extend heterodyne interferometers into the far-infrared range.

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