Terrace-microsphere lasers: spherical cavity lasers for multiwavelength emission

Hiyori Uehara; Tetsuji Yano; Shuichi Shibata

doi:10.1117/12.841087

25 February 2010 Terrace-microsphere lasers: spherical cavity lasers for multiwavelength emission

Hiyori Uehara, Tetsuji Yano, Shuichi Shibata

Proceedings Volume 7598, Optical Components and Materials VII; 75981E (2010) https://doi.org/10.1117/12.841087
Event: SPIE OPTO, 2010, San Francisco, California, United States

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 (n_D=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 n_D=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.

Citation Download Citation

Hiyori Uehara, Tetsuji Yano, and Shuichi Shibata "Terrace-microsphere lasers: spherical cavity lasers for multiwavelength emission", Proc. SPIE 7598, Optical Components and Materials VII, 75981E (25 February 2010); https://doi.org/10.1117/12.841087

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