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Effects of Pumping Sizes on THz Radiation Based on Ultrashort Light Pulse Optical Rectification for High Spatial Resolution T-Ray Imaging |
| XU Shi-Xiang1,2, DAI Xiao-Ming1, YANG Xiao-Hua1, LI Jing-Zhen2 |
| 1State Key Laboratory of Precision Spectroscopy, and Department of Physics, East China Normal University, Shanghai 2000622Shenzhen Key Lab of Micro-Nano Photonics Department, Shenzhen University, Shenzhen 518060 |
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| Cite this article: |
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XU Shi-Xiang, DAI Xiao-Ming, YANG Xiao-Hua et al 2008 Chin. Phys. Lett. 25 4262-4265 |
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Abstract We present our experimental studies on the effects of the pumping sizes on THz radiation based on ultrashort light pulse optical rectification for high spatial resolution T-Ray imaging. Our experiments show that high spatial resolution T-ray imaging requires both thin THz emitter and sample, and rigorous tolerance of the gap between the sample and the emitter, as well as small pumping size which usually much smaller compared with THz wavelength. Such a small pumping size results in dramatic decrease of the THz wave power, which originates from strong diffraction of THz wave, the depolarization of the focused tightly pumping beam, the spatial filtering of the emitter exit-surface, and the strong phase-mismatching between the pumping and the high spatial Fourier components of the THz signal, rather than two-photon absorption
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| Keywords:
42.40.Lx
42.65.Ky
42.65.Re
42.65.-k
07.57.-c
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Received: 08 April 2008
Published: 27 November 2008
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| PACS: |
42.40.Lx
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(Diffraction efficiency, resolution, and other hologram characteristics)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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42.65.-k
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(Nonlinear optics)
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07.57.-c
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(Infrared, submillimeter wave, microwave and radiowave instruments and equipment)
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