Construction of THz-pulse characterization tools
碩士 === 國立中正大學 === 物理所 === 97 === The region of the electromagnetic spectrum with frequencies between 10^11 and 10^13 Hz is called the terahertz (THz) region. Recently, numerous of THz radiation has be demonstrated in chemical, physical, and biological. So the development of high power and broadband...
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ndltd-TW-097CCU051980092016-05-04T04:25:47Z http://ndltd.ncl.edu.tw/handle/03971206723907582744 Construction of THz-pulse characterization tools 建造量測兆赫茲脈衝的診斷工具 Shiau-Ting Huang 黃筱庭 碩士 國立中正大學 物理所 97 The region of the electromagnetic spectrum with frequencies between 10^11 and 10^13 Hz is called the terahertz (THz) region. Recently, numerous of THz radiation has be demonstrated in chemical, physical, and biological. So the development of high power and broadband THz sources becomes an important research topic and will attract more new techniques using such sources. In this thesis, we construct a THz source with four-wave mixing by using BBO crystal in our laboratory, and we can choose the transmitting spectral band by using various materials as filters. Moreover, we establish three detection systems to detect the THz waves including the automatic scanning of the software, and acquisition programs. First, a Fourier transform spectrometer is used to measure the THz wave waveform and find the THz wave spectrum. With spectrum analysis tool, we verify that using the GaAs wafer can not only reflect the visible light but also limit the transmitting frequency band to 8~20 um. Second, Photoconducting switch is used to detect the pulse duration of THz wave and THz wave focal spot size. The pulse duration is measured to be 175 fs and the focal spot of 1000 um is found when THz wave is focused by a OAP with a 278-mm focal length. Third, four-wave mixing in air is also employed to detect the pulse duration. The measured pulse duration of 150 fs agrees well with that measured by the former technique. Jiunn-Yuan Lin Szu-yuan Chen 林俊元 陳賜原 2009 學位論文 ; thesis 74 zh-TW |
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碩士 === 國立中正大學 === 物理所 === 97 === The region of the electromagnetic spectrum with frequencies between 10^11 and 10^13 Hz is called the terahertz (THz) region. Recently, numerous of THz radiation has be demonstrated in chemical, physical, and biological. So the development of high power and broadband THz sources becomes an important research topic and will attract more new techniques using such sources.
In this thesis, we construct a THz source with four-wave mixing by using BBO crystal in our laboratory, and we can choose the transmitting spectral band by using various materials as filters. Moreover, we establish three detection systems to detect the THz waves including the automatic scanning of the software, and acquisition programs. First, a Fourier transform spectrometer is used to measure the THz wave waveform and find the THz wave spectrum. With spectrum analysis tool, we verify that using the GaAs wafer can not only reflect the visible light but also limit the transmitting frequency band to 8~20 um. Second, Photoconducting switch is used to detect the pulse duration of THz wave and THz wave focal spot size. The pulse duration is measured to be 175 fs and the focal spot of 1000 um is found when THz wave is focused by a OAP with a 278-mm focal length. Third, four-wave mixing in air is also employed to detect the pulse duration. The measured pulse duration of 150 fs agrees well with that measured by the former technique.
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author2 |
Jiunn-Yuan Lin |
author_facet |
Jiunn-Yuan Lin Shiau-Ting Huang 黃筱庭 |
author |
Shiau-Ting Huang 黃筱庭 |
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Shiau-Ting Huang 黃筱庭 Construction of THz-pulse characterization tools |
author_sort |
Shiau-Ting Huang |
title |
Construction of THz-pulse characterization tools |
title_short |
Construction of THz-pulse characterization tools |
title_full |
Construction of THz-pulse characterization tools |
title_fullStr |
Construction of THz-pulse characterization tools |
title_full_unstemmed |
Construction of THz-pulse characterization tools |
title_sort |
construction of thz-pulse characterization tools |
publishDate |
2009 |
url |
http://ndltd.ncl.edu.tw/handle/03971206723907582744 |
work_keys_str_mv |
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