Farnesi Daniele, Berneschi Simone, Cosi Franco, Righini Giancarlo C, Soria Silvia, Nunzi Conti Gualtiero
Enrico Fermi Center; Institute of Applied Physics "N. Carrara", IFAC-CNR.
Institute of Applied Physics "N. Carrara", IFAC-CNR.
J Vis Exp. 2016 Apr 4(110):e53938. doi: 10.3791/53938.
Dielectric microspheres can confine light and sound for a length of time through high quality factor whispering gallery modes (WGM). Glass microspheres can be thought as a store of energy with a huge variety of applications: compact laser sources, highly sensitive biochemical sensors and nonlinear phenomena. A protocol for the fabrication of both the microspheres and coupling system is given. The couplers described here are tapered fibers. Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility Χ((3)) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS). A proof of the cavity-enhanced phenomenon is given by the lack of correlation among the pump, signal and idler: a resonant mode has to exist in order to obtain the pair of signal and idler. In the case of hyperparametric oscillations (four wave mixing and stimulated anti-stokes Raman scattering), the modes must fulfill the energy and momentum conservation and, last but not least, have a good spatial overlap.
介电微球可以通过高品质因子回音壁模式（WGM）将光和声限制一段时间。玻璃微球可被视为一种具有多种应用的能量储存器：紧凑型激光源、高灵敏度生化传感器以及非线性现象。本文给出了微球和耦合系统的制备方案。这里描述的耦合器是锥形光纤。本文介绍了在三重共振二氧化硅微球中与三阶光学非线性极化率χ((3))相互作用相关的非线性现象的高效产生。这里报道的相互作用有：受激拉曼散射（SRS）以及包括受激反斯托克斯拉曼散射（SARS）在内的四波混频过程。泵浦光、信号光和闲频光之间缺乏相关性证明了腔增强现象：为了获得信号光和闲频光对，必须存在一个共振模式。在超参量振荡（四波混频和受激反斯托克斯拉曼散射）的情况下，这些模式必须满足能量和动量守恒，而且，最重要的是，要有良好的空间重叠。
