光学学报, 2013, 33 (7): 0714001, 网络出版: 2013-06-07
相位锁定的激光器系统用于电磁诱导透明光谱实验
Phase-Locked Laser System Used for Electromagnetically Incluced Transparency Spectral Experiments
激光光学 锁相环 鉴相器 相位噪声 拍频 电磁诱导透明 laser optics phase locked loop phase-frequency detector phase noise beat frequency electromagnetically induced transparent
摘要
使用数字锁相环ADF4107芯片，设计了锁频带宽为1~7 GHz的光学锁相环(OPLL)。通过光学探测器得到两台外腔半导体激光器的拍频信号，经过OPLL，产生两种误差信号，它们分别被加载到半导体激光器的光栅压电陶瓷和反馈电流上，从而将拍频信号的噪声由兆赫兹降低到赫兹量级。将该系统应用到电磁诱导透明光谱实验中，成功地观察到电磁诱导透明现象。该方法还可应用到超冷原子拉曼光谱实验中。
Abstract
We design an optical phase locked loop (OPLL) whose bandwidth is 1~7 GHz with ADF4107. Through a fast photo-detector, we can obtain a beat signal of two external cavity diode lasers. Then, two kinds of error signal are generated while passing OPLL, which are respectively loaded into the grating piezolectric ceramics and feedback current of semiconductor lasers to reduce the noise of the beat signal from MHz to Hz. The system is successfully used in electromagnetically induced transparency (EIT) spectral experiment. This method can be also applied to the Raman spectroscopy experiments of ultra-cold atoms.
孟增明, 张靖. 相位锁定的激光器系统用于电磁诱导透明光谱实验[J]. 光学学报, 2013, 33(7): 0714001. Meng Zengming, Zhang Jing. Phase-Locked Laser System Used for Electromagnetically Incluced Transparency Spectral Experiments[J]. Acta Optica Sinica, 2013, 33(7): 0714001.
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