Journal article

Frequency noise characterisation of narrow linewidth diode lasers

LD Turner, KP Weber, CJ Hawthorn, RE Scholten

OPTICS COMMUNICATIONS | ELSEVIER SCIENCE BV | Published : 2002

Abstract

We examine several approaches to laser frequency noise measurement in the frequency and time domains. Commonly employed methods such as optical frequency discrimination and the Allan variance are found to be complex, expensive, time-consuming, or incomplete. We describe a practical method of demodulating a laser beat note to measure a frequency noise spectrum, using a phase-locked loop frequency discriminator based on a single low-cost integrated circuit. This method measures the frequency noise spectrum of a laser directly and in detail and is insensitive to intensity fluctuations. The advantages of this scheme are demonstrated through measurement of the frequency noise spectrum for two ext..

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University of Melbourne Researchers