title: Observation of two-photon fluorescence for Rhodamine 6G in microbubble resonators.
abstract: 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.
authors.forename: Gregory A
authors.initials: GA
authors.lastname: Cohoon
authors.forename: Khanh
authors.initials: K
authors.lastname: Kieu
authors.forename: Robert A
authors.initials: RA
authors.lastname: Norwood