[1] [1] MCKAY A, DAWES J M. Tunable terahertz signals using a helicoidally polarized ceramic microchip laser［J］. IEEE Photonics Technology Letters, 2009, 21(7): 480-482.

[2] [2] RROLLAND A, FREIN L, VALLENT M, et al. 40-GHz photonic synthesizer using a dual-polarization picrolaser［J］. IEEE Photonics Technology Letters, 2010, 22(23): 1738-1740.

[3] [3] BRUNEL M, AMON A, VALLENT M. Dual-polarization microchip laser at 1.53μm［J］.Optics Letters, 2005, 30(18): 2418-2420.

[4] [4] KERVEVA L, GILLES H, GIRARD S, et al. Beat-note jitter suppression in a dual-frequency laser using optical feedback［J］. Optics Letters, 2007, 32(9): 1099-1101.

[5] [5] GOUET J L, MORVAN L, ALOUINI M, et al. Dual-frequency single-axis laser using a lead lanthanum zirconate tantanate (PLZT) birefringent etalon for millimeter wave generation: beyond the standard limit of tenability［J］. Optics Letters, 2007, 32(9):1090-1092.

[6] [6] BRUNEL M, BRETENAKER F, BLANC S, et al. High-spectral purity RF beat note generated by a two-frequency solid-state laser in a dual thermooptic and electrooptic phase-locked loop［J］. IEEE Photonics Technology Letters, 2004, 16(3): 870-872.

[7] [7] PILLET G, MORVAN L , BRUNEL M, et al. Dual-frequency laser at 1.5μm for optical distribution and generation of high-purity microwave signals［J］.Journal of Lightwave Technology, 2008, 26(15): 2764-2772.

[8] [8] EVTUHOV V,SIEGMAN A E. Twisted-mode technique for obtaining axially uniform energy density in a laser cavity［J］. Applied Optics, 1965, 394(1): 142-143.

[9] [9] XING Jun-hong, JIAO Ming-xing.Two-cavity dual-frequency Nd∶YAG laser with a twisted-mode configuration［J］. Acta Photonica Sinica, 2015, 44(2): 0214003.

[10] [10] HAO Er-juan, TAN Hui-ming, LI Te, et al.Single-frequency laser at 473 nm by use of twisted-mode technique［J］. Optics Communication, 2007, 270: 327-331.

[11] [11] POLYNKIN P, POLYNKIN A, MANSURIPUR M, et al. Single-frequency laser oscillator with watts-level output power at 1.5μm by use of a twisted-mode technique［J］. Optics Letters, 2005,30 (20): 2745-2747.

[12] [12] GUDELEV V G, MASHHO V V, NIKEENKO N K, et al. Diode-pumped CW tunable two-frequency YAG:Nd3+ laser with coupled resonators［J］. Applied Physics B, 2003, 76(3): 249-252.

[13] [13] XING Jun-hong, JIAO Ming-xing, LIU Yun. T-shaped cavity dual-frequency Nd∶YAG laser with electro-optical modulation［J］. Optical Engineering, 2016, 55(5): 056115.

[14] [14] CHENG Guang-hua, DONG Shu-fu, WANG Yi-shan, et al.The actual linewidth of laser with birefringence filter in oscillator［J］. Acta Photonica Sinica, 2003, 32(7): 790-793.

[15] [15] WANG Jun-ying, ZHENG Quan, XUE Qing-hua, et al. 1.12W single-frequency green laser adopting birefringent filter technique［J］. Acta Photonica Sinica, 2005, 34(3): 321-324.

[16] [16] LI Lei, ZHAO Chang-ming, ZHANG Peng, et al. The study on diode-pumped two-frequency solid-state laser with tunable frequency difference［J］. Acta Physica Sinica, 2007, 56(5): 2663-2669.

[17] [17] WU Xia, YANG Su-hui, CHEN Ying, et al. Tunable two-frequency solid state laser with coupled-cavity configuration［J］. Acta Optica Sinica, 2012, 32(3): 0314003.

[18] [18] BRUNEL M, EMILF O, BETENAKER F, et al. Molva. Tunable two frequency lasers for lifetime measurements［J］. Optics Review, 1997, 4(5): 550-552.

[19] [19] REN Cheng, ZHANG Shu-lian. Diode-pumped dual-frequency microchip Nd∶YAG laser with tunable frequency difference［J］. Journal of Physics D: Applied Physics, 2009,42: 155107.