Ferguson J B, Morris R H
Appl Opt. 1978 Sep 15;17(18):2924-9. doi: 10.1364/AO.17.002924.
Internal-mirror 6328-A He-Ne lasers have an intramode frequency difference when placed in a transverse magnetic field. When the magnetic field strength is increased until the Zeeman frequency shift approaches the mode spacing, mode coupling is nduced. In some multimode lasers, this mode coupling results in a collapse into single-mode operation with no loss of over-all laser power in the output. The intramode frequency difference can be exploited to produce a simple frequency stabilization system whose frequency variation is less than 1 part in 10(10). Plots of beat frequency variation and single-mode tuning range are included.
内腔式6328 - A型氦氖激光器在置于横向磁场中时会出现模内频率差。当磁场强度增加到塞曼频移接近模间距时，就会引发模式耦合。在一些多模激光器中，这种模式耦合会导致激光器转变为单模工作模式，而输出的总激光功率不会损失。可以利用模内频率差来构建一个简单的频率稳定系统，其频率变化小于10的10次方分之一。文中还给出了拍频变化和单模调谐范围的图表。
