Abstract-Green laser induced terahertz tuning range expanding in KTiOPO4 terahertz parametric oscillator

Chao Yan^1,2, Yuye Wang^1,2,3,a), Degang Xu^1,2,a), Wentao Xu^1,2,Pengxiang Liu^1,2, Dexian Yan^1,2, Pan Duan^1,2, Kai Zhong^1,2, Wei Shi^1,2 and Jianquan Yao^1,2
 HIDE AFFILIATIONS
1 Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China
2 Key Laboratory of Optoelectronic Information Science and Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
3 Institute of Neurosurgery, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
a) Authors to whom correspondence should be addressed. Electronic addresses:yuyewang@tju.edu.cn and xudegang@tju.edu.cn.
Appl. Phys. Lett. 108, 011107 (2016); http://dx.doi.org/10.1063/1.4939548
http://scitation.aip.org/content/aip/journal/apl/108/1/10.1063/1.4939548?TRACK=RSS

532 nm green laser is utilized to achieve terahertz tuning range expanding in KTiOPO4 terahertz parametric oscillator. With the theoretical analysis of the stimulated polaritonscattering, an expanded tunability of the KTiOPO4 terahertz parametric oscillator can be realized. A wide terahertz output tuning range from 5.7 to 6.1 THz, from 7.4 to 7.8 THz, from 11.5 to 11.8 THz, and from 13.3 to 13.5 THz was demonstrated in our experiment, and the result well matched the analysis. The maximum terahertz output energy was 1.61 μJ under the pump energy of 140 mJ, corresponding to the maximum THz wave conversion efficiency of 1.3 × 10⁻⁵, and the threshold pump energy is about 30 mJ.