High-energy, ultra-wideband tunable and compact terahertz source based on DAST crystal via difference frequency generation

doi:10.11972/j.issn.1001-9014.2019.04.015

Home > Archive>Volume 38, Issue 4, 2019 >485-492. DOI:10.11972/j.issn.1001-9014.2019.04.015

High-energy, ultra-wideband tunable and compact terahertz source based on DAST crystal via difference frequency generation
DOI:
                        10.11972/j.issn.1001-9014.2019.04.015
                    
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Affiliation:1.Institute of Laser and Optoelectronics, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China;2.Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China;3.The 46th research institute of China Electronics Technology Group Corporation, Tianjin 300220, China;4.Institute of Neurosurgery, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
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Fund Project:the National Basic Research Program of China (973) 2015CB755403;the National Key Research and Development Projects 2016YFC0101001;National Natural Science Foundation of China 61775160 61771332 61471257;China Postdoctoral Science Foundation 2016M602954;Postdoctoral Science Foundation of Chongqing Xm2016021Supported by the National Basic Research Program of China (973) (2015CB755403), the National Key Research and Development Projects (2016YFC0101001), National Natural Science Foundation of China (61775160, 61771332, 61471257), China Postdoctoral Science Foundation (2016M602954)，and Postdoctoral Science Foundation of Chongqing (Xm2016021)

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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.

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HE Yi-Xin, PANG Zi-Bo, ZHU Xian-Li, XU De-Gang, Wang Yu-Ye, MENG Da-Lei, WU Cong, CHENG Hong-Juan, XU Yong-Kuan, YAO Jian-Quan. High-energy, ultra-wideband tunable and compact terahertz source based on DAST crystal via difference frequency generation[J]. Journal of Infrared and Millimeter Waves,2019,38(4):485~492

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Received:October 30,2018
Revised:February 25,2019
Adopted:February 25,2019
Online: September 06,2019
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