Influence of Laser Polarization on Fiber-Type Terahertz Time-Domain Spectrometer

Meiqi Feng; Qing Sun; Yuqiang Deng; Qing Ding; Chaochen Li; Kun Zhao

doi:10.3788/CJL201946.0614019

Chinese Journal of Lasers, Volume. 46, Issue 6, 0614019(2019)

Influence of Laser Polarization on Fiber-Type Terahertz Time-Domain Spectrometer

Meiqi Feng^1,2, Qing Sun^2、*, Yuqiang Deng², Qing Ding³, Chaochen Li², and Kun Zhao¹

¹ Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum,Beijing 102249, China

² Division of Optics and Laser Metrology, National Institute of Metrology, Beijing 100029, China

³ Resource and Environment Branch, China National Institute of Standardization, Beijing 100191, China

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Figures & Tables(7)

Fig. 1. Fiber-type THz-TDS system. (a) Principle diagram; (b) physical map

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Fig. 2. Effect of pump laser polarization angle on THz time-domain waveform when θHWP2=0°.(a) THz time-domain waveforms; (b) radar map of peak ratio of THz time-domain waveform at fast axis

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Fig. 3. Effect of probe laser polarization angle on THz time-domain waveform when θHWP1=75°.(a) THz time-domain waveforms; (b) radar map of peak ratio of THz time-domain waveform at fast axis

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Fig. 4. Effect of probe laser polarization angle on THz time-domain waveform when θHWP1=165°.(a) THz time-domain waveforms; (b) radar map of peak ratio of THz time-domain waveform at fast axis

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Fig. 5. THz signals when polarization directions of pump laser and probe laser are parallel to fast or slow axis of PMF. (a) THz time-domain waveforms; (b) frequency-domain spectra

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Fig. 6. THz signals when angle between polarization direction of pump or probe laser and fast or slow axis of PMF is 45°. (a) THz time-domain waveforms; (b) frequency-domain spectra

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Table 1. Correspondence relationship between polarization direction of pump or probe laser and peak position of THz time-domain waveform
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Table 1. Correspondence relationship between polarization direction of pump or probe laser and peak position of THz time-domain waveform
Polarization directionof pump laser Polarization directionof detect laser Peakposition /ps
Fast axis Fast axis 6.62
Slow axis Fast axis 8.44
Fast axis Slow axis 8.62
Slow axis Slow axis 10.44

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Meiqi Feng, Qing Sun, Yuqiang Deng, Qing Ding, Chaochen Li, Kun Zhao. Influence of Laser Polarization on Fiber-Type Terahertz Time-Domain Spectrometer[J]. Chinese Journal of Lasers, 2019, 46(6): 0614019

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