为了产生1064 nm单频可调谐Nd:YAG激光输出，设计了一种二极管抽运电光可调谐单频Nd:YAG激光器，采用偏振分光棱镜（PBS）和铌酸锂(LN)晶体组成电光双折射滤光片,作为激光单纵模选择元件和频率调谐元件。理论分析了其选模原理及调频原理，实验研究了1064 nm Nd:YAG激光单纵模振荡特性和调频特性。实验结果表明：这种Nd:YAG激光器能以线偏振单纵模稳定振荡，当改变加在LN晶体上的横向电压时，1064 nm单纵模激光振荡波长调谐量为0.474 nm, 相应的频率调谐量为142.2 GHz。这种电光可调谐1064 nm单频Nd:YAG激光器可广泛应用于激光干涉测量、激光雷达探测和激光光谱学等领域。

In order to produce the single frequency tunable laser output at 1064 nm, a diode-pumped electro-optically tunable single frequency Nd:YAG laser is designed, which includes an electro-optically birefringent filter (PBS-LN) consisting of both a polarizing beam splitter (PBS) and a lithium niobate (LN) crystal, used as both a single longitudinal mode selector and a frequency tuning element. The principles of mode selection and frequency tuning of the PBS-LN are theoretically analyzed, and the characteristics of single longitudinal mode oscillation and frequency tuning of the Nd:YAG laser at 1064 nm are investigated experimentally. The experimental results have shown that the Nd:YAG laser can steadily oscillate in linearly polarized single longitudinal mode, and by changing the transverse voltages applied to the LN element, the wavelength of single longitudinal mode laser at 1064 nm can be tuned by 0.474 nm, corresponding to the frequency tuning of 142.2 GHz. Such an electro-optically tunable single frequency Nd:YAG laser will find wide applications in the fields of laser interferometry, laser radar detection and laser spectroscopy, etc.