[1] Zhang Shulian. Principle of Orthogonally Polarized Lasers［M］. Beijing: Tsinghua University Press, 2005

[2] Liang Jing, Long Xingwu, Zhang Bin et al.. Spectral selection in He-Ne laser by internal F-P eta-lon［J］. Acta Optica Sinica, 2009, 29(11): 3108～3112

[3] Min-Seok Kim, Seung-Woo Kim. Two-longitudinal-mode He-Ne laser for heterodyne interfer-ometers to measure displacement［J］. Appl. Opt., 2002, 41(28): 5938～5942

[4] Zhou Zhaofei, Zhang Tao, Zhu Mucheng et al.. Research on the laser beat-wave interferometry［J］. Chinese J. Lasers, 2005, 32(1): 101～104

[5] Zhu Mucheng, Zhou Zhaofei, Zhang Tao. Research of the He-Ne laser beat-wave interferometer［J］. Laser Technology, 2004, 28(5): 531～533

[6] Jin Guofan, Li Jingzhen. Laser in Metrology［M］. Beijing: Science Press, 1998

[7] Zhang Zhiping, Cheng Zhaogu, Qin Zhaoyu et al.. Influence of acceleration on the error of laser dual-frequency interferometer［J］. Chinese J. Lasers, 2007, 34(5): 694～698

[8] Jiao Mingxing, Qi Ruili. Recent progress and developing trend of dual-frequency laser tech-niques［J］. Optical Technique, 2004, 30(1): 125～128

[9] Liang Jing, Long Xingwu. Stability analysis of beat frequency in double-longitudinal mode He-Ne laser［J］. Acta Optica Sinica, 2009, 29(5): 1301～1304

[10] W. W. Chow, J. B. Hambenne, T. J. Hutchings et al.. Multioscillator laser gyros［J］. IEEE J. Quant. Electron., 1980, QE-16(9): 918～936

[11] Jiang Yanan. Ring Laser Gyro［M］. Beijing: Tsinghua University Press, 1985, 54～57

[12] Wang Zhiguo, Long Xingwu, Wang Fei. Dispersion equalization of four-frequency differential laser gyro-scope with non-planar resonator［J］. Acta Optica Sinica, 2009, 29(10): 2892～2897

[13] Wang Zhiguo, Long Xingwu, Wang Fei et al.. Magnetic sensitivity and optimal operating point of four-frequency differential laser gyroscope［J］. Acta Optica Sinica, 29(11): 3202～3206

[14] Zhou Bingkun, Gao Yizhi, Chen Tirong et al. Laser Principle(Fourth edition)［M］. Beijing: National Defense Industry Press, 2000: 183～184

[15] Luo Hui, Guo Shaojun, Hu Shaomin et al.. Research and design on high precision fre-quency-stability measurement system of ring laser gyroscope［J］. Chinese J. Inertial Technol., 2005, 13(6): 86～89

[16] Wang Fei. High stability digital power supply with current control for laser gyro［D］. Changsha: National University of Defense Technology, 2002

[17] M. Sargent III, M. O. Scully, W. E. Lamb. Laser Physics［M］. Transl. Yang Shunhua, Peng Fang. Beijing: Science Press, 1982