Journal
OPTICS LETTERS
Volume 34, Issue 19, Pages 2958-2960Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.002958
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- U. S. Air Force Office of Scientific Research (AFOSR)
- NASA
- National Science Foundation (NSF)
- U. S. Department of Energy (DOE) [DE-AC04-94AL85000]
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We demonstrate the phase locking of a 2.7 THz metal-metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (x12) from a microwave synthesizer at similar to 15 GHz. Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. The spectral analysis of the beat signal confirms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range. (C) 2009 Optical Society of America
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