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为了产生大频差可调谐双频激光输出,利用偏振分光棱镜(PBS)的自然分光和起偏作用,将激光谐振腔分成正交的直线腔和直角腔,设计一种激光二极管端面抽运频差可调谐双频Nd∶YAG激光器。该激光器的两个腔均采用双折射滤光片使1064 nm振荡激光的p和s偏振分量分别以单纵模振荡输出。理论分析双折射滤光片的选模原理和双频激光同时振荡原理,实验研究1064 nm Nd∶YAG激光单纵模振荡特性和调频特性。实验观察到的1064 nm双频激光的频差调谐范围为11.4~168.6 GHz,其最大频差达到Nd∶YAG的荧光线宽。这种大频差可调谐1064 nm双频Nd∶YAG激光器可广泛应用于激光干涉测量和激光光谱学等领域。
In order to produce a large frequency difference tunable dual-frequency laser output, the laser cavity is divided into orthogonal linear cavity and right-angle cavity by using the natural beam splitting and polarizing effect of polarizing beam splitter prism (PBS). A laser diode end pumping frequency Difference tunable dual-frequency Nd: YAG laser. Both of the two cavities of the laser adopt birefringent filter to make the p and s polarization components of the 1064 nm oscillation laser oscillate with single longitudinal mode respectively. Theoretical analysis of birefringent filter selection principle and dual-frequency laser simultaneous oscillation principle, experimental study of 1064 nm Nd: YAG laser single longitudinal mode oscillation characteristics and FM characteristics. The experimentally observed frequency tuning range of 1064 nm dual-frequency laser ranged from 11.4 to 168.6 GHz, with the maximum frequency difference reaching the Nd: YAG fluorescence linewidth. This large frequency difference tunable 1064 nm dual-frequency Nd: YAG laser can be widely used in laser interferometry and laser spectroscopy and other fields.