High-sensitive terahertz detection by parametric up-conversion using nanosecond pulsed laser
Yuye Wang(王与烨)1,2, Gang Nie(聂港)1,2, Changhao Hu(胡常灏)1,2, Kai Chen(陈锴)1,2, Chao Yan(闫超)1,2, Bin Wu(吴斌)3, Junfeng Zhu(朱军峰)3, Degang Xu(徐德刚)1,2,†, and Jianquan Yao(姚建铨)1,2
1 Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China; 2 Key Laboratory of Optoelectronic Information Technology(Ministry of Education), Tianjin University, Tianjin 300072, China; 3 Science and Technology on Electronic Test & Measurement Laboratory, Qingdao 266555, China
Abstract A high-sensitive terahertz detector operating at room temperature was demonstrated based on parametric up-conversion. A nanosecond 1064-nm Nd:YAG laser was used to pump the parametric up-conversion detector and the up-conversion from terahertz wave to NIR laser was realized in a lithium niobate crystal. The minimum detectable terahertz energy of 9 pJ was realized with the detection dynamic range of 54 dB, which was three orders of magnitude higher than that of commercial Golay cell. The detectable terahertz frequency range of the detection system was 0.90 Thz-1.83 THz. Besides, the effects of pump energy and effective gain length on the detection sensitivity were studied in experiment. The results showed that higher pump energy and longer effective gain length are helpful for improving the detection sensitivity of parametric up-conversion detector.
Yuye Wang(王与烨), Gang Nie(聂港), Changhao Hu(胡常灏), Kai Chen(陈锴), Chao Yan(闫超), Bin Wu(吴斌), Junfeng Zhu(朱军峰), Degang Xu(徐德刚), and Jianquan Yao(姚建铨) High-sensitive terahertz detection by parametric up-conversion using nanosecond pulsed laser 2022 Chin. Phys. B 31 024204
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