Abstract
Millimeter- and Terahertz-waves can be conveniently generated by photomixing, where the beating of two laser sources onto a photoconductive detector generates signals with a tunability that is much wider than what typically allowed by electronic techniques. Several methods have been proposed to reduce the linewidth of the mm-wave and THz-wave signals generated by photomixing, in order to meet applications’ requirements (linewidth < 100 kHz, phase noise < 100 dBc @100 kHz offset) [1], and all of them are based on inducing a stable phase relationship between the original laser modes. A novel method to phase-lock two semiconductor laser modes oscillating at ν1 and ν2 is represented by mutual injection-locking assisted by Four Wave Mixing (FWM) generated using a third auxiliary mode at νAUX = (ν1+ν2)/2 as pump [2].
© 2011 Optical Society of America
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