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Proceedings Paper

Terrace-microsphere lasers: spherical cavity lasers for multiwavelength emission
Author(s): Hiyori Uehara; Tetsuji Yano; Shuichi Shibata
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Paper Abstract

We have successfully made terrace-microspheres for laser emission: micrometer size spherical cavity laser having terrace shaped pumping light entrance. "Terrace-microsphere" is a high refractive index glass sphere (nD=1.93) of 30μm in diameter with terrace portion of organic-inorganic materials. The glass sphere is in BaO-SiO2-TiO2 glass system and contain a few ppm of Nd3+. Organic-inorganic hybrid materials of refractive index nD=1.45 were prepared by sol-gel technique using 3-methacryloxypropyltrimethoxysilane and tetramethoxysilane as starting materials. To make terrace portion, a pico-liter of sol droplet was supplied with a micro-capillary into the boundary between a glass sphere and a Teflon sheet. The sol-derived part attached to a sphere showed the flat portion like a terrace structure. The terrace-microspheres were pumped with a tunable CW Ti:sapphire laser (λ=700nm-850nm) for choosing the suitable pumping wavelengths to WGMs. Pumping the terrace portion at around 800nm wavelength, strong resonances due to WGMs were demonstrated. The resonances originated from Raman scattering and Nd3+ fluorescence were observed at 840-880nm and 880-940nm wavelength region respectively. Consequently, we can show the potential application for a multi-wavelength laser (about 100 lines) at the extended wavelength range (840-940nm) in the near-infrared. Stimulated Raman emission of WGMs was performed with threshold of 4mW.

Paper Details

Date Published: 25 February 2010
PDF: 9 pages
Proc. SPIE 7598, Optical Components and Materials VII, 75981E (25 February 2010); doi: 10.1117/12.841087
Show Author Affiliations
Hiyori Uehara, Tokyo Institute of Technology (Japan)
Tetsuji Yano, Tokyo Institute of Technology (Japan)
Shuichi Shibata, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 7598:
Optical Components and Materials VII
Shibin Jiang; Michel J. F. Digonnet; John W. Glesener; J. Christopher Dries, Editor(s)

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