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Improved common-path spectral interferometer for single-shot terahertz detection

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Abstract

To seek high signal-to-noise ratio (SNR) is critical but challenging for single-shot intense terahertz (THz) coherent detection. This paper presents an improved common-path spectral interferometer for single-shot THz detection with a single chirped pulse as the probe for THz electro-optic (EO) sampling. Here, the spectral interference occurs between the two orthogonal polarization components with a required relative time delay generated with only a birefringent plate after the EO sensor. Our experiments show that this interferometer can effectively suppress the noise usually suffered in a non-common-path interferometer. The measured single-shot SNR is up to 88.85, and the measured THz waveforms are independent of the orientation of the used ZnTe EO sensor, so it is easy to operate and the results are more reliable. These features mean that the interferometer is quite qualified for applications where strong THz pulses, usually with single-shot or low repetition rate, are indispensable.

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DOI:10.1364/prj.6.000177

基金项目:National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61490710, 61775142, 61705132); Science and Technology Planning Project of Guangdong Province (2016B050501005); Specialized Research Fund for the Shenzhen Strategic Emerging Industries Development (JCYJ20150324141711651, JCYJ20150525092941064, JCYJ20170412105812811).

收稿日期:2018-01-05

录用日期:2018-01-08

网络出版日期:2018-01-10

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Shuiqin Zheng:Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, ChinaSZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
Qinggang Lin:Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Yi Cai:Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Xuanke Zeng:Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, ChinaSZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
Ying Li:SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
Shixiang Xu:Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Jingzhen Li:Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Dianyuan Fan:SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China

联系人作者:Shixiang Xu(shxxu@szu.edu.cn)

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引用该论文

Shuiqin Zheng, Qinggang Lin, Yi Cai, Xuanke Zeng, Ying Li, Shixiang Xu, Jingzhen Li, and Dianyuan Fan, "Improved common-path spectral interferometer for single-shot terahertz detection," Photonics Research 6(3), 177-181 (2018)

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