Observation of two-photon fluorescence for Rhodamine 6G in microbubble resonators

Gregory A. Cohoon, Khanh Kieu, Robert A. Norwood

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We report an observation of multi-photon excitation of organic chromophores in microbubble whispering gallery mode resonators. High-Q microbubble resonators were formed by heating a pressurized fused silica capillary to form a hollow bubble that was then filled with liquid. In this work, the microbubble was filled with a solution of Rhodamine 6G dye. The resonator and dye were excited by evanescently coupling continuous wave (CW) light from a 980 nm laser diode using a tapered optical fiber. The two-photon fluorescence of the dye can be seen with pump powers as low as 700 μW.

Original languageEnglish (US)
Pages (from-to)3098-3101
Number of pages4
JournalOptics letters
Issue number11
StatePublished - Jun 1 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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