4.5 Article

Stabilizing a laser frequency by the Pound-Drever-Hall technique with an acousto-optic modulator

Journal

APPLIED OPTICS
Volume 60, Issue 5, Pages 1159-1163

Publisher

Optica Publishing Group
DOI: 10.1364/AO.415011

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Funding

  1. China Postdoctoral Science Foundation [2019M652557]
  2. Youth Innovation Promotion Association of the Chinese Academy of Sciences [2017378]
  3. National Natural Science Foundation of China [11674361]
  4. National Key Research and Development Program of China [2016YFA0302800]

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In this study, a method of optical phase modulation in the PDH technique was developed using an AOM for stable phase and light power coupling. The laser linewidth was suppressed to approximately 907.91 Hz using this method.
We develop and demonstrate a method of optical phase modulation in the Pound-Drever-Hall (PDH) technique. The phase modulation in this paper is realized by an acousto-optic modulator (AOM) operating in the Bragg diffraction regime. In this process, a light beam separated from a laser (780 nm) is sent through the AOM twice and coupled to a high finesse Fabry-Perot cavity. Then, the light power coupling into the cavity is stabilized by modulating the optical amplitude with this AOM. The coupling light power is stabilized to a level of 10(-3). In the meantime, the PDH error signal is obtained by modulating the optical phase with the same AOM. After the error signal is fed back to the laser current, the laser linewidth is suppressed to approximately 907.91 Hz. This method of phase modulation is simple and convenient, and we believe it can be widely used in modulation transfer spectroscopy and frequency-modulation sideband spectroscopy. (C) 2021 Optical Society of America

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