Optical sum-frequency generation in a whispering-gallery-mode resonator

Dmitry V. Strekalov, Abijith S. Kowligy, Yu Ping Huang, Prem Kumar

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


We demonstrate sum-frequency generation between a telecom wavelength and the Rb D2 line, achieved through natural phase matching in a nonlinear whispering gallery mode resonator. Due to the strong optical field confinement and ultra high Q of the cavity, the process saturates already at sub-mW pump peak power, at least two orders of magnitude lower than in existing waveguide-based devices. The experimental data are in agreement with the nonlinear dynamics and phase matching theory based on spherical geometry. Our experimental and theoretical results point toward a new platform for manipulating the color and quantum states of light waves for applications such as atomic memory based quantum networking and logic operations with optical signals.

Original languageEnglish (US)
Article number053025
JournalNew Journal of Physics
StatePublished - May 2014


  • nonlinear optics
  • sum-frequency generation
  • whispering-gallerymode resonators

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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