【摘要】 本文从谐振腔的角度研究He-Ne激光的方向稳定性问题.首先求出共焦腔在反射镜对称倾斜时的本征模式,由此讨论其输出激光的方向飘移.然后借助共焦腔与平凹腔的等价关系从理论上求得方向稳定的平凹腔的凹面镜曲率半径与腔长的比值β应等于1.综合考虑平凹腔的稳定工作区域和强度稳定性的要求,β值应大一些.试制了β=1.2的He-Ne激光器测量结果表明方向稳定性明显提高.更多还原

【Abstract】 Unstable beam direction of the laser is caused by many factors. The important one is that the tilt of reflector in resonator is not stable. This article studied the way to stabilize the beam direction of a He-Ne laser by stabilizing the angle of the resonator. First the eigen-modes of confocal cavity in which the reflector is symmetrically tilted have been calculated, and the shift of the laser beam in direction for this cavity has been discussed. For the flat-concave cavity with stabilized beam direction, R/L = 1 has been found out theoretically by means of equivalence of confocal and flat-concave cavity. In consideration of the stable region for the flat-concave cavity and the stability of laser intensity should be larger. The He-Ne laser of β = 1.2 has been made, for which the directional stability is evidently better.更多还原