基于光电反馈的固体Nd:YAG激光器强度噪声压缩

Suppression of the Intensity Noise in Solid Nd:YAG Lasersby Optoelectronic Feedback

阐述了固体激光器强度噪声的特性,实验观测表明驰豫振荡是单块固体Nd:YAG激光器强度噪声的主要来源,噪声峰值的中心频率随着泵浦和输出功率的增加向高频方向移动,且在中心频率附近发生180°相位跳变.当1064nm红外激光输出功率为1W时,弛豫振荡峰值频率约为650kHz.采用光电反馈的方法设计制作了噪声压缩电路,使得噪声峰值中心频率位置的幅度降低30dB,低频区域噪声压缩幅度约10dB.

Expatiating on the intensity noise properties of solid lasers, the experiments find the relaxation oscillation noise (RON) is the main reason to bring intensity noise in the monolithic Nd:YAG laser. With the pump power increases, the center frequency of the RON peak increases also and the phase changes by 180° across the resonance. When 1064 nm laser output power about 1 W, the RON center frequency about 650 kHz. We designed an optoelectronic feedback circuit. The experiment results show that the RON peak value is reduced 30 dB and low frequency intensity noise reduced about 10 dB.