【摘要】 首先,从激光器凹形反射镜有源稳定共焦腔具有束腰半径而非圆柱形激光束,由此考虑到:激光器谐振腔中光束为且有包括束腰细处呈现双曲线形而非圆柱形是与谐振腔中反射境为凹镜有关的,进而考察有关实验数据,即从（二氧化碳激光器与氖氦激光器）束腰半径与反射镜半径之间的关系这两个特例进行考察,用激光器谐振腔中光线往返传播矩阵计算出谐振腔中心点O往外至反射镜半径之半处O₁到两反射镜边缘连线A¹O₁A为光线近似为零区,而AO₁A’BC’O₁₁CB’A为光线密集区,据对称性可知轴的另一侧的光线密集区的位置。考察结果是:不仅二氧化碳激光器、氖氦激光器,而且一般的共焦腔凹形反射镜激光器的基模束腰半径W_os小于OO₁,即Wos小于反射镜半径的一半是一个普遍规律.然后,解释了束腰半径Wos小于反射镜半径一半a/2的原因,最后,解释了《激光原理》中的共焦腔模的场为什么主要集中在反射镜面中心附近很小的区域的原因。更多还原

【Abstract】 In this paper,first of all,notice the concave reflector active stability confocal cavity Laser has waist radius rather than cylindrical beam,So considering the Laser beam in the cavity include for waist and have been appear double curvy rather than cylindrical is related to the concave mirror in resonant cavity,explore the relevant experimental data,that is,from the telalionship between the radius of reflector and the waist radius of CO₂ laser and Ne-He laser,with a light matrix back and forth in the Laser cavity,calculate the radius of the outward to the center cavity mirror O to half mirror radius center O₁ and the reflector edge A’O₁A attachment in the are that light approximate zero,and the AO₁A’BC’O₁₁CB’A is the light concentration areas,according to the symmetry,can infer the light concentration areas on the other side. Inspection result is: not only a CO₂ Laser,Ne-He Laser,and the general confocal cavity concave reflector Laser fundamental mode beam waist radius is less than half the radius of reflector,means w_osis lessthan OO₁,and this is a general law. Then,explains the fundamental mode beam waist radius w_osis less than half of the mirror radius a/2. End,explais the principle of Laser confocal modes of why field are mainly concentrated in small area near the epicenter of the mirror.更多还原