激光二极管抽运单块高斜度效率环形腔单频固体激光器

Laser Diode Pumped High-Slope-Efficiency Monolithic Unidirectional Single Frequency Ring Laser

对于单块结构非平面环形腔单频固体激光器,谐振腔尺寸和输出耦合面偏振膜反射系数的选取是其获得单频、高效率、高功率输出的关键。采用琼斯矩阵的方法讨论了单块激光器获得单频输出的工作原理。通过对谐振腔回路琼斯矩阵特征值的平方及特征值平方差的计算,提出了在晶体尺寸、磁场及抽运功率一定的情况下,通过对单块非平面环形腔输出耦合面偏振膜反射系数的设计来提高激光器的单频输出功率及斜度效率的方法。实验采用光纤耦合输出激光二极管(LD)纵向抽运单块激光器,当抽运功率最高用到 2 .83 W时,获得了最大 1 .20 W的1064 nm单频激光输出,斜度效率达47 .4%。

The crystal size and the reflectivity of S and P polarization components of the output coupling (Rs and Rp are crucial for the operation of the monolithic single frequency ring laser. The working principle of single frequency operation of the monolithic ring laser was discussed by means of Jones matrix. In order to achieve high single frequency output power and high slope efficiency, Rs and Rp were determined by calculating the square eigenvalues and the differences of square eigenvalues of Jones matrix of the resonator as well as considering the optimum output coupling for given crystal size, magnetic field and pumping power. A fiber coupled diode laser was used as pumping source in experiment. Single frequency output power of 1.20 W with the slope efficiency of 47.4% was obtained when input pumping power was 2.83 W.