Terahertz Radiation Mechanisms in ZnSe at Femtosecond Laser Pulse Excitation
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概要
- 論文の詳細を見る
Terahertz (THz) radiation mechanisms from $\langle 111\rangle$ ZnSe crystals excitated using a femtosecond (fs) laser have been experimentally studied by transmission and reflection THz generation and detection methods. It was found that the radiated THz waveforms show clear opposite polarities by increasing laser excitation density. Different pump polarization dependences were also investigated for low and high excitation densities. The obtained experimental results show that three different radiation mechanisms coexist in the THz radiation from ZnSe and the dominant THz radiation mechanism changes from drift current to diffusion current and to optical rectification, while increasing fs laser power from low to high and excitation from high to very high, respectively.
- 2007-04-15
著者
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WANG Gang
State Key Laboratory of Optoelectronic Materials and Technologies & School of Chemistry and Chemical
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Jia Tianqing
State Key Laboratory Of High Field Laser Physics Shanghai Institute Of Optics And Fine Mechanics Chi
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Wu Xiaojun
State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, School of Physics and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, P. R. China
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Chen Xiaoshu
State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, School of Physics and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, P. R. China
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Zhao Fuli
State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, School of Physics and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, P. R. China
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Jia Tianqing
State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, School of Physics and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, P. R. China
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Zhao Fuli
State Key Laboratory of Optoelectonic Materials and Technologies, Zhongshan University, Guangzhou 510275, China
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Wang Gang
State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University
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