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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。
The optical nonlinearity of the resonance characteristics in the microsphere cavitation whisper gallery mode was analyzed. The resonance spectrum and demodulation curve of the SiO2 microsphere cavity with the diameter of 1 mm were simulated. The microsphere cavity coupling test system , The resonant line with the full width at half maximum of 78.42MHz and the Q value of 2.5 × 106 was obtained. The resonant line was demodulated synchronously by the sine wave phase modulation technique to reduce the effect of the phase reset pulse noise. The loop frequency lock technique was used to track and lock the resonant frequency, and the lock-in accuracy and lock-in time were analyzed. The experimental results showed that the time to lock the transmission spectrum intensity to 1% was 8 ms and the measured frequency shift resolution after lock was 375 kHz, which provides experimental evidence for the sensing of the microsphere cavity.