一种内置法布里-珀罗标准具选择He-Ne激光器内谱线的方法

He-Ne激光器中633 nm波长的增益远大于该波段其它5条谱线的增益,而且由于模式竞争的影响,通常情况下增益较低的相邻弱线(如629 nm波长)很难出光.提出一种在He-Ne激光器中加入法布里-珀罗(F-P)标准具来选择输出谱线的方法.通过选择适当的F-P标准具长度和反射率,可以达到抑制强线增益,使弱线振荡输出的目的.还采用高斯光束传输理论对谐振腔内F-P标准具的透射特性进行了仿真计算.

Spectral Selection in He-Ne Laser by Internal F-P Etalon

In He-Ne laser, since the 633 nm line has higher gain than the other 5 lines around its band, as far as the mode competition is concerned, it's hard for the line with low gain (such as the 629 nm line) to emit. A spectral selection method in He-Ne laser by Fabry-Perot (F-P) etalon is discussed in this paper. By choosing the proper length and reflectivity of the F-P etalon, the line with high gain can be restrained while keep the weak one untouched. In this way, the line with weak gain can emit. The transmitting properties of F-P etalon in cavity are calculaled by Gaussian beam theory.