Longitudinal mode noise conversion by atomic vapour

A. P. Willis*, A. I. Ferguson, D. M. Kane

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


An external cavity diode laser with very low levels of amplitude noise is shown to have considerable amounts of frequency noise at the longitudinal mode spacing frequency. This noise is observed by tuning the laser near to resonance with an atomic vapour and measuring the transmission of the vapour with a photodiode. The measured noise is enhanced by more than two orders of magnitude at the longitudinal modespacing frequency by conversion of frequency noise to amplitude noise by the vapour. The frequency noise was also simulated using intracavity electro optic modulation.

Original languageEnglish
Pages (from-to)31-34
Number of pages4
JournalOptics Communications
Issue number1-3
Publication statusPublished - 15 Dec 1995

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