Wideband laser locking to an atomic reference with modulation transfer spectroscopy

Physics – Atomic Physics

Scientific paper

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10 pages; 3 figures; 1 table

Scientific paper

We demonstrate that conventional modulated spectroscopy apparatus, used for simple laser stabilization in many atomic physics laboratories, can be enhanced to provide a wideband laser lock delivering deep supression of frequency noise across the acoustic range. Using an acousto-optic modulator driven with a phase-locked agile oscillator, we show that wideband frequency modulation of the pump laser in modulation transfer spectroscopy produces the unique single lock-point spectra previously demonstrated with electro-optic phase modulation. Careful design of the demodulation electronics provides more than one megahertz of available feedback bandwidth from a rubidium atomic reference. Limited by our laser electronics we achieve a laser lock with 100 kHz feedback bandwidth, reducing frequency noise by 20 dB across the acoustic range and narrowing the imputed linewidth by a factor of two.

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