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中文摘要：
对微球腔耳语回廊模式下的谐振特性所表现出的光学非线性进行了分析,对直径1mm的SiO2微球腔的谐振谱线和解调曲线进行了仿真;搭建了微球腔耦合测试系统,得到了微球腔半高全宽值为78.42MHz、Q值为2.5×106的谐振谱线;基于正弦波相位调制技术对谐振谱线进行了同步解调,以减小相位复位脉冲噪声的影响;采用环路锁频技术实现了谐振频率的跟踪和锁定,对锁定精度和锁定时间进行了分析,实验结果为锁定透射谱强度至1%的时间为8 ms,锁定后可测频移分辨率为375 kHz,为微球腔的传感测量提供了实验依据。
英文摘要：
The nonlinear optics of the microsphere cavity at whispering-gallery mode （WGM） was analyzed. The resonance characteristics and the demodulation curve were simulated for SiO2 microsphere cavity, whose diameter was 1 mm. The testing system of coupled microsphere cavity with the taper fiber was set up. The full width at half maximum （FWHM） is 78.42 MHz, thus quality factor is 2.5x106. The resonance characteristics and the demodulation curve derive from the experiments based on the sine wave phase modulation technique, which is free of pulse noise induced by phase reset. Loop frequency locking technique was used, then the resonance frequency was tracked and locked; and the locking precision and the locking time were analyzed. Experiments results show that the time for locking to 1% of the transmission intensity is 8 ms. The resolution of measured resonance shift is 375 kHz. Thus, it provides an experimental basis for sensing measurements of the microsphere cavity.
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