[1] Tian Zhaoshuo, Wang Qi, Wang Yusan et al.. Study of RF excited waveguide CO2 laser with two channels tuned by grating[J]. Chinese J. Lasers, 2000, 27(11)： 961～964

[2] M. E. Portnoi, O. V. Kibis, M. Rosenau da Costa. Terahertz applications of carbon nanotubes[J]. Superlattices and Microstructures, 2008, 43: 399～407

[3] D. Dragoman, M. Dragoman. Terahertz fields and applications[J]. Progress in Quantum Electronics, 2004, 28: 1～66

[4] Li Dehua, Zhou Wei, Xu Shilin et al.. The generation and detection of THz wave[J]. Physics and Engineering, 2007, 17(6): 34～37

[5] Li Lei, Zhao Changming, Gao Lan et al.. Laser detection by electronic instead of optical using two-frequency laser[J]. Acta Optica Sinica, 2007, 27(2): 249～252

[6] Atsushi Kenmochi, Tadao Tanabe, Yutaka Oyam et al.. Terahertz wave generation from GaSe crystals and effects of crystallinity P.H.[J]. J. Physics and Chemistry of Solids, 2008, 69: 605～607

[7] K. Saito, T. Tanabe, Y. Oyam et al.. Terahertz-wave absorption in GaP crystals with different carrier densities[J]. J. Physics and Chemistry of Solids, 2008, 69: 597～600

[8] Ma Xiaojing, Dai Bin, Ge Min. Research and applications of terahertz radiation[J]. Chemical Industry Times, 2006, 20(12): 51～53

[9] W. Shi, Y. J. Ding. Tunable terahertz waves generated by mixing twocopropagating infrared beams in GaP[J]. Opt. Lett., 2005, 30(9): 1030～1032

[10] S. Y. Tochitsky, C. Sung, S. E. Trubnick et al.. High-power tunable, 0.5～3 THz radiation source based on nonlinear difference frequency mixing of CO2 laser lines[J]. J. Opt. Soc. Am. B, 2007, 24(9): 2509～2516

[11] Y. Jiang, Y. J. Ding. Efficient terahertz generation from two collinearly propagating CO2 laser pulses[J]. Appl. Phys. Lett., 2007, 91: 091108