猫眼激光谐振腔横模选择特性研究

将猫眼逆向器作为激光谐振腔的一个腔镜组成猫眼谐振腔。介绍了猫眼逆向器的结构,阐述了猫眼逆向器中凸透镜和凹面镜的间距改变时猫眼曲率半径的相应变化,并通过有效地控制该间距来选择激光横模,从而保证基横模输出。在激光谐振腔衍射积分方程的基础上,运用牛顿柯特斯数学方法,对不同参量下的猫眼激光谐振腔的横模状况进行分析,得出了各阶横模对应的特征值和功率损耗,计算出保证基横模输出的参量,并与实验对比,得到了一致的结论,为激光器的横模选择和控制提供了一种简便易行的新方法。

Research of the Laser Transverse Mode Modulated by the Cat's Eye Resonator

The cat's eye resonator is designed with a cat's eye reflector as the resonator mirror. The configuration of the cat's eye reflector is described. The relation between the focal length of the cat's eye reflector and the distance between the convex lens and the concave mirror of the cat's eye reflector is indicated. Through controlling that distance in the cat's eye reflector, laser transverse mode is selected to ensure fundamental transverse mode output. In Newton-Cotes method based on the diffractive integral equation of the caser, laser transverse mode of the cat's eye cavity laser under variable parameters is analyzed. The eigenvalue ηmn and power loss which every transverse mode corresponds with are calculated. The parameter assuring fundamental transverse mode output obtained is well accordant to the experimental results. Therefore, a new convenient on-line means for the control and selection of the laser transverse mode is discovered.