[1] Tonouchi M. Cutting-edge terahertz technology[J]. Nature Photonics, 1, 97-105(2007).

[2] Li W J, Wang T Y, Zhou Y et al. Terahertz non-destructive inspection of air defect within adhesive layers of multi-layer bonded structure[J]. Acta Optica Sinica, 37, 0111002(2017).

[3] Zhang W T, Wang S Y, Zhan P P et al. Method of identifying red wood based on terahertz time-domain spectroscopy[J]. Acta Optica Sinica, 37, 0230006(2017).

[4] Li M Q, Tan Z Y, Qiu F C et al. Fast reflective scanning imaging based on terahertz quantum-cascade laser[J]. Acta Optica Sinica, 37, 0611004(2017).

[5] Li N, Bai Y, Liu P. Ellipticity characteristic of terahertz radiation source generated from vacuum jet target[J]. Acta Optica Sinica, 37, 0326002(2017).

[6] Sun B, Yao J Q. Generation of terahertz wave based on optical methods[J]. Chinese Journal of Lasers, 33, 1349-1359(2006).

[7] Tang G Q, Cong Z H, Qin Z G et al. Energy scaling of terahertz-wave parametric sources[J]. Optics Express, 23, 4144-4152(2015). http://europepmc.org/abstract/MED/25836452

[8] Hayashi S, Nawata K, Taira T et al. Ultrabright continuously tunable terahertz-wave generation at room temperature[J]. Scientific Reports, 4, 5045-5049(2015). http://www.nature.com/articles/srep05045

[9] Zhang R L, Qu Y C, Zhao W J et al. Si-prism-array coupled terahertz-wave parametric oscillator with pump light totally reflected at the terahertz-wave exit surface[J]. Optics Letters, 41, 4016-4018(2016). http://europepmc.org/abstract/MED/27607961

[10] Kawase K, Shikata J I, Imai K et al. Transform-limited, narrow-linewidth, terahertz-wave parametric generator[J]. Applied Physics Letters, 78, 2819-2821(2001). http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4896465

[11] Li Y, Zhang X Y, Cong Z H et al. Injection-seeded terahertz parametric oscillator based on ring-cavity configuration[J]. Chinese Journal of Lasers, 44, 1014001(2017).

[12] Yang Z, Wang Y Y, Xu D G et al. High-energy terahertz wave parametric oscillator with a surface-emitted ring-cavity configuration[J]. Optics Letters, 41, 2262-2264(2016). http://www.ncbi.nlm.nih.gov/pubmed/27176978

[13] Sun B, Li S X, Liu J S et al. Terahertz-wave parametric oscillator with a misalignment-resistant tuning cavity[J]. Optics Letters, 36, 1845-1847(2011). http://europepmc.org/abstract/MED/21593910

[14] Kawase K, Shikata J I, Minamide H et al. Arrayed silicon prism coupler for a terahertz-wave parametric oscillator[J]. Applied Optics, 40, 1423-1424(2001). http://www.opticsinfobase.org/abstract.cfm?uri=ao-40-9-1423

[15] Imai K, Kawase K, Minamide H et al. Achromatically injection-seeded terahertz-wave parametric generator[J]. Optics Letters, 27, 2173-2175(2002). http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-27-24-2173

[16] Wang W T, Cong Z H, Chen X H et al. Terahertz parametric oscillator based on KTiOPO4 crystal[J]. Optics Letters, 39, 3706-3708(2014). http://europepmc.org/abstract/MED/24978716

[17] Yan C, Wang Y Y, Xu D G et al. Green laser induced terahertz tuning range expanding in KTiOPO4 terahertz parametric oscillator[J]. Applied Physics Letters, 108, 011107(2016). http://scitation.aip.org/content/aip/journal/apl/108/1/10.1063/1.4939548

[18] Li Z Y, Bing P B, Yuan S. Theoretical analysis of terahertz parametric oscillator using KTiOPO4 crystal[J]. Optics & Laser Technology, 82, 108-112(2016). http://www.sciencedirect.com/science/article/pii/S0030399215306083

[19] Wu M H, Chiu Y C, Wang T D et al. Terahertz parametric generation and amplification from potassium titanyl phosphate in comparison with lithium niobate and lithium tantalate[J]. Optics Express, 24, 25964-25973(2016). http://europepmc.org/abstract/med/27857335

[20] Wang W T, Cong Z H, Liu Z J et al. THz-wave generation via stimulated polariton scattering in KTiOAsO4 crystal[J]. Optics Express, 22, 17092-17098(2014). http://www.ncbi.nlm.nih.gov/pubmed/25090523

[21] Ortega T A, Pask H M, Spence D J et al. Stimulated polariton scattering in an intracavity RbTiOPO4 crystal generating frequency-tunable THz output[J]. Optics Express, 24, 10254-10264(2016). http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-24-10-10254

[22] Ortega T A, Pask H M, Spence D J et al. Tunable 3-6 THz polariton laser exceeding 0.1 mW average output power based on crystalline RbTiOPO4[J]. IEEE Journal of Selected Topics in Quantum Electronics, 24, 1-6(2018). http://ieeexplore.ieee.org/document/8304638/

[23] Gao F L, Zhang X Y, Cong Z H et al. Terahertz parametric oscillator with the surface-emitted configuration in RbTiOPO4 crystal[J]. Optics & Laser Technology, 104, 37-42(2018). http://www.sciencedirect.com/science/article/pii/S0030399217310472

[24] Wang W T, Zhang X Y, Wang Q P et al. Multiple-beam output of a surface-emitted terahertz-wave parametric oscillator by using a slab MgO∶LiNbO3 crystal[J]. Optics Letters, 39, 754-757(2014). http://europepmc.org/abstract/med/24562198

[25] Ikari T, Zhang X B, Minamide H et al. THz-wave parametric oscillator with a surface-emitted configuration[J]. Optics Express, 14, 1604-1610(2006). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT05000005000005000038000001&idtype=cvips&gifs=Yes

[26] Ikari T, Minamide H, Ito H. Energy scalable and high beam quality THz-wave parametricoscillator using surface emitted cavity configuration. [C]∥2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, September 18-22, 2006, Shanghai, China. New York: IEEE, 333-333(2006).