4.7 Article

Brillouin backaction thermometry for modal temperature control

期刊

OPTICA
卷 9, 期 7, 页码 701-705

出版社

Optica Publishing Group
DOI: 10.1364/OPTICA.459082

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资金

  1. Defense Advanced Research Projects Agency [N66001-16-1-4046]
  2. Air Force Office of Scientific Research [FA9550-18-1-0353]
  3. Kavli Nanoscience Institute

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Stimulated Brillouin scattering provides optical gain for efficient and narrow-linewidth lasers, but strict temperature control is required for long term frequency-stable operation. This study explores Brillouin backaction for measuring and phase-sensitively locking modal temperature to a reference temperature, offering a new approach for frequency-stable operation of Brillouin lasers.
Stimulated Brillouin scattering provides optical gain for efficient and narrow-linewidth lasers in high-Q microresonator systems. However, the thermal dependence of the Brillouin process as well as the microresonator frequencies impose strict temperature control requirements for long term frequency-stable operation. Here, we study Brillouin backaction and use it to both measure and phase-sensitively lock modal temperature to a reference temperature defined by the Brillouin phase matching condition. At a specific lasing wavelength, the reference temperature can be precisely set by adjusting the resonator's free spectral range. This backaction control method is demonstrated in a chip-based Brillouin laser, but can be applied in all Brillouin laser platforms. It offers a new approach for frequency-stable operation of Brillouin lasers in atomic clock, frequency metrology, and gyroscope applications. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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