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[2] Yang Sen, Zhang Shulian. The frequency split phenomenon and its application in laser a HeNe laser with a rotation quartz crystal plate in its cavity[J]. Opitcal Communicaiton, 68, 55-57(1988).

[3] Zhang Shulian, He Wenkai. Laser split by rotating an intracavity, tilt cut crystal quartz plate around its surface normal axis[J]. Optical Communications, 97, 210-214(1993).

[4] Han Yanmei, Zhang Shulian, Li Yan, et al. Study of hard-sealed tunable photoelastic birefringence dual-frequency lasers[J]. Chinese Journal of Lasers B, 7, 193-198(1998).

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[6] Li Yan, Fu Jie, Han Yanmei. Intensity tuning characteristics of a frequency splitting he-ne laser[J]. Laser & Infrared, 30, 30-32(2000).

[7] Liu Weixin, Holzapfel Wolfgang, Zhu Jun, et al. Differential variation of laser longitudinal mode spacing induced by small intra-cavity phase anisotropies[J]. Optics Communications, 282, 1602-1606(2009).

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[9] Ren Libin, Ding Yingchun, Zhou Lufei, et al. Mid-frequency difference He-Ne Z-B laser with elastic force-exerting and its frequency[J]. Infrared and Laser Engineering, 37, 814-817, 825(2008).

[10] [10] Zhang Shulian, Ding Yingchun, Tan Yidong. Laser Laser Beams[M]. Beijing: Tsinghuam University Press, 2021: 338339. (in Chinese)