4 March 2014 Multiphoton excitation of organic chromophores in microbubble resonators
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We report the observation of multiphoton excitation of organic chromophores in microbubble whispering gallery mode resonators. High-Q microbubble resonators are a formed by heating a pressurized fused silica capillary to form a hollow bubble which can be filled with liquid. In this case, the microbubble is filled with a solution of Rhodamine 6G dye. The resonator and dye are excited by evanescently coupling CW light from a 980nm laser diode using a tapered optical fiber. The two-photon fluorescence of the dye can be seen with pump powers as low as 1 mW.
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Gregory A. Cohoon, Gregory A. Cohoon, Khanh Kieu, Khanh Kieu, Robert A. Norwood, Robert A. Norwood, } "Multiphoton excitation of organic chromophores in microbubble resonators", Proc. SPIE 8960, Laser Resonators, Microresonators, and Beam Control XVI, 89600L (4 March 2014); doi: 10.1117/12.2038053; https://doi.org/10.1117/12.2038053

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