[1] [1] Xu Jingzhou, Zhang Xicheng. Terahertz Science and Technology and Application[M]. Beijing: Peking University Press, 2007: 1-20.

[2] [2] Zhiyong Tan, Li Gu, Tianhong Xu, et al.. Real-time reflection imaging with terahertz camera and quantum-cascade laser[J]. Chin Opt Lett, 2014, 12(7): 070401.

[3] [3] Zheng Xianhua,Wang Xinke, Sun Wenfeng, et al.. Developments and applications of the terahertz digital holography [J]. Chinese J Lasers, 2014, 41(2): 0209003.

[4] [4] Li Qi, Hu Jiaqi, Li Yunda, et al.. Autofocusing research on terahertz Gabor inline digital holography[J]. Acta Optica Sinica, 2014, 34(s1): s111001.

[5] [5] Qingzhao Wu, Li Gu, Zhiyong Tan, et al.. Detection of a directly modulated terahertz light with quantum-well photodetector[J]. Chin Opt Lett, 2014, 12(12): 120401.

[6] [6] Zhang Jingshui, Zhu Weiwen, Zhao Yuejin, et al.. Passive THz imaging system based on the crank-rocker mechanism[J]. Acta Optica Sinica, 2013, 33(12): 1211006.

[7] [7] Kim N, Han SP, Ko H, et al.. Tunable CW THz generation detection with compact 1.55 mm detuned dual mode laser diode and InGaAs based photomixer[J]. Opt Express, 2011, 19(16): 15397-15403.

[8] [8] Lianping Hou, Mohsin Haji, Iain Eddie, et al.. Laterally coupled dual-grating distributed feedback lasers for generating mode-beat terahertz signals[J]. Opt Lett, 2015, 40 (2): 182-185.

[9] [9] Yang Qing, Huo Yujing, Duan Yusheng, et al.. Double-longitudinal-mode continuous-wave laser with ultra-large frequency difference used for narrowband terahertz-wave generation[J]. Acta Optica Sinica, 2013, 33(5): 0514002.

[10] [10] Yating Zhou, Jie Hou, Xiangfei Chen, et al.. Dual current injection tunable SBG semiconductor laser with asymmetric π equivalent phase shift[J]. Microwave and Optical Technology Letters, 2013, 55(3): 692–696.

[11] [11] Junqi Liu, Jianyan Chen, Tao Wang, et al.. High efficiency and high power continuous-wave semiconductor terahertz lasers at 3.1 THz[J]. Solid-State Electronics, 2013, 81: 68-71.

[12] [12] Qin Xuefei. The Investigation of Mid-Infrared Difference Frequency Laser Generation Based on PPLN Crystal[D]. Jinhua: Zhejiang Norma University, 2013: 1-2.