High-energy, ultra-wideband tunable and compact terahertz source based on DAST crystal via difference frequency generation
Received:October 30, 2018  Revised:February 25, 2019  download
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Author NameAffiliationE-mail
HE Yi-Xin Institute of Laser and Optoelectronics, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China 
tju_heyixin@tju.edu.cn 
PANG Zi-Bo The 46th research institute of China Electronics Technology Group Corporation, Tianjin 300220, China hakky@126.com 
ZHU Xian-Li Institute of Laser and Optoelectronics, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China 
qddxzhuxianli@163.com 
XU De-Gang Institute of Laser and Optoelectronics, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China 
xudegang@tju.edu.cn 
Wang Yu-Ye Institute of Laser and Optoelectronics, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
Institute of Neurosurgery, Southwest Hospital, Third Military Medical University, Chongqing 400038, China 
yuyewang@tju.edu.cn 
MENG Da-Lei The 46th research institute of China Electronics Technology Group Corporation, Tianjin 300220, China mdl.1019@163.com 
WU Cong The 46th research institute of China Electronics Technology Group Corporation, Tianjin 300220, China wucong8060122@126.com 
CHENG Hong-Juan The 46th research institute of China Electronics Technology Group Corporation, Tianjin 300220, China xiemn08@126.com 
XU Yong-Kuan The 46th research institute of China Electronics Technology Group Corporation, Tianjin 300220, China orientallion@126.com 
YAO Jian-Quan Institute of Laser and Optoelectronics, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China 
 
Abstract:We have demonstrated a compact, high-energy and broadly tunable monochromatic terahertz (THz) source with the dimensional size of 40 cm×25 cm, based on difference frequency generation (DFG) in DAST crystal, grown in two-zone growth method. The THz frequency was tuned randomly and rapidly in the range of 0.3~19.6 THz due to the widely tunable KTP-OPO and galvano-optical beam scanner. The highest pulse energy of 4.02 μJ was obtained at 18.6THz in our system. And the highest signal to noise ratio of 32.24 dB was realized at 4.3 THz using 4K-Bolometer detector. Furthermore, the characteristics of THz polarization and divergence angle were measured experimentally. Saturation phenomenon for THz output was observed and studied. Moreover, the transmission THz spectroscopies of materials in solid state were measured with the ultra-wideband tunable THz source based on DAST crystal.
keywords:DAST  crystal  terahertz  ultra-wideband tunable
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Copyright:《Journal of Infrared And Millimeter Waves》