Laser frequency offset locking using electromagnetically induced transparency

S. C. Bell*, D. M. Heywood, J. D. White, J. D. Close, R. E. Scholten

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    57 Citations (Scopus)

    Abstract

    The authors have used an electromagnetically induced transparency resonance in rubidium as a dispersive reference to lock the relative frequency of two lasers to the atomic ground-state hyperfine splitting. The beat frequency between the two lasers directly generates a microwave signal at 3.036 GHz (Rb85) or 6.835 GHz (Rb87). High bandwidth (600 kHz) feedback was achieved with only low-frequency (10 MHz) electronics using the frequency modulation sideband method. The spectral width of the microwave beat frequency was reduced to less than 1 kHz. The technique offers a convenient and low-cost method suitable for many topical two-frequency experiments, including coherent population trapping, slow light, lasing without inversion, and Raman sideband cooling.

    Original languageEnglish
    Article number171120
    JournalApplied Physics Letters
    Volume90
    Issue number17
    DOIs
    Publication statusPublished - 2007

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