Laser-noise-induced population fluctuations in two- and three-level systems

Thomas Haslwanter, H Ritsch, J Cooper, P Zoller

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Significant fluctuations, above the shot-noise limit, have been observed in the intensity of fluorescent light scattered from atoms excited by an intense noisy laser, where a central role is played by the nonlinearity of the atom-field interaction. By considering the variance of the atomic populations, we show that noise spectroscopy is sensitive to the field statistics of the laser. We specifically consider the cases of resonance fluorescence (analogous in the weak-field limit to analysis by a Fabry-Pérot interferometer), two-photon excitation, and double optical resonance for variable laser intensity and bandwidth. We show that large differences in the noise spectra can occur between lasers characterized by a phase-diffusion or a phase-jump model, although these models would give the same values for the mean atomic populations. We believe that observation of population fluctuations can become a useful method for characterizing laser noise.

Original languageEnglish
Pages (from-to)5652-5659
Number of pages8
JournalPhysical Review A
Volume38
Issue number11
DOIs
Publication statusPublished - Jan 1988

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