Whispering-gallery modes (WGMs) on
-doped glass microspheres with a radius of
were measured in a modified confocal microscope, where a dual spatial resolution in both excitation and detection zones was possible. As an alternative to the standard excitation mechanism by an evanescent wave, we used an efficient pumping/ detecting scheme, focusing a laser in the microsphere and exciting the
ions, whose fluorescent emission produces the WGMs. We have also measured the generated WGMs by changing the detection zone, where higher amplitude resonances were found when exciting in the center and detecting at the edge of the microsphere.
© 2011 Optical Society of America
(170.1790) Medical optics and biotechnology : Confocal microscopy
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
Lasers and Laser Optics
Original Manuscript: November 9, 2010
Revised Manuscript: January 3, 2011
Manuscript Accepted: January 4, 2011
Published: February 17, 2011
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics
L. L. Martín, P. Haro-González, I. R. Martín, D. Navarro-Urrios, D. Alonso, C. Pérez-Rodríguez, D. Jaque, and N. E. Capuj, "Whispering-gallery modes in glass microspheres: optimization of pumping in a modified confocal microscope," Opt. Lett. 36, 615-617 (2011)
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