用电磁力获得应力双折射及双频激光

Using electromagnetical force to get stress birefringence and dual frequency laser

提出和研究一种新的方法，即利用电磁铁的电磁力去产生和控制双频激光器的频差。采用半内腔式的激光器结构，激光增益管窗片的两表面镀有高增透膜并作为腔内应力双折射元件。调节电磁铁电压的大小，电磁铁沿窗片径向所施加的压力的大小也随之改变，因而使频差得以产生和控制。频差由光电探测器检测，其大小由频率计读出。

This paper introduces a new method for both producing and controlling the frequency difference of a dual frequency laser by using an electromagnetical force which is applied onto the window plate. In our experiments, we use a half-intracavity laser. The discharge tube's window plate with high anti-reflecting film is used as a stress birefringence element. The electromagnet applies a force along a diameter of the window plate. When the voltage of electromagnet is tuned, the force is adjusted too. So the frequency difference is produced and controlled. The frequency difference is detected by a photo-electric detector and countered by a frequency meter.