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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。
A new method is proposed and researched, that is, the electromagnetic force of the electromagnet is used to generate and control the frequency difference of the dual-frequency laser. With a semi-cavity laser structure, the two surfaces of the laser gain tube are coated with a highly antireflective film and act as a stress-birefringent element in the cavity. Adjust the size of the electromagnet voltage, the size of the electromagnet applied along the radial direction of the window also changes, so that the frequency difference can be generated and controlled. The frequency difference is detected by a photodetector, and its size is read by a frequency meter.