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加横向磁场的内镜He—Ne激光管输出相互正交的π和δ两种线偏振光。π光和δ光间的拍频f_(πδ)与腔的调谐状况、磁场和腔镜固有双折射等因素有关,稳定拍频即可获得频率稳定的光频。Morris和Umeda等人采用这种方法得到了频率稳定性达3×10~(-10)(0.1—100sec.)的激光。在国内巴恩旭等人给出了频率稳定性达2.5×10~(-9)的激光。
The transverse magnetic field endoscope He-Ne laser tube outputs two kinds of linearly polarized light of π and δ which are orthogonal to each other. The beat frequency f_ (πδ) between the π light and the δ light is related to the cavity tuning condition, the magnetic field and the intrinsic birefringence of the endoscope, and the stable beat frequency can obtain the frequency-stabilized optical frequency. Morris and Umeda et al. Used this method to obtain a laser with a frequency stability of 3 × 10 -10 (0.1-100 sec.). In China, Banxu et al. Gave a laser with a frequency stability of 2.5 × 10 ~ (-9).