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976 nm激光抽运二氧化硅微球级联拉曼散射激光的研究
Study of cascaded raman scattering laser in silica microsphere pumped by 976 nm laser
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摘要: 利用电极放电产生的电弧高温熔融二氧化硅单锥细纤，熔融的二氧化硅在表面张力作用下形成表面光滑的微球，完成高品质因子微球腔的制备.将976 nm激光通过锥光纤以倏逝场方式高效耦合入微球，研究具有高能量密度回廊模的微球腔中的三阶非线性现象--受激拉曼散射现象.在实验中测得了六级级联的拉曼散射激光，各级拉曼散射激光分别测得单纵模或多纵模；在抽运光功率不少于582.6μW时，测得位于1200 nm附近的拉曼散射激光；当抽运光功率为3.014 mW时，测得位于1287.04 nm附近的第六级拉曼散射激光.Abstract: High-quality-factor microspheres with smooth surface are fabricated through surface tension by heating and fusing a single tapered fiber using arc of electrodes discharge. Stimulated Raman scattering of the third order nonlinear phenomena of microspheres with high power density whispering gallery modes was studied by coupling 976 nm laser into microspheres through tapered fiber as evanescent wave. The total six cascaded Raman lasers were observed in the experiment. At each order, single longitudinal mode and multi longitudinal mode Raman lasers were observed. The Raman laser at around 1200 nm was measured with pump power less than 582.6 μW. The sixth-order Raman laser at around 1287.04 nm was observed when pump power is 3.014 mW.
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