PROJECT TITLE :

Optical phase-locking of two longitudinal modes of a dual-mode laser for millimetre-wave signal generation

ABSTRACT:

Phase-locking of two longitudinal oscillating modes of a twin-mode microchip laser that has a hundred and one GHz longitudinal-mode spacing has been successfully demonstrated by using electronic negative-feedback control. Since the two longitudinal modes were oscillating simultaneously in the same laser cavity, the common-mode fluctuation cancels, resulted in the small needed control bandwidth of ∼4 kHz. This narrow-bandwidth part-locking technique is helpful for generating high-spectral-purity millimetre-wave signals with a significantly less complicated setup.