7 September 2011 THz wave up-frequency turning by rapidly plasma creation
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When plasmas are instantaneously created around an electromagnetic wave, frequency of the wave up-converted to the frequency, which depends on the plasma frequency. This phenomenon is called as the flash-ionization predicted by S. C. Wilks et al [1]. The theory requires not only the plasma creation in time much shorter than an oscillation period of the electromagnetic wave but also plasma length much longer than a wavelength of it. We have demonstrated the proof of principle experiment using the interaction between a terahertz wave and plasmas created by an ultra short laser pulse, which ensures the plasma creation time-scale much shorter than a period of electromagnetic source wave and plasma length longer than a wavelength of the wave. We observed frequency upconversion from 0.35 THz to 3.3 THz by the irradiance of the Ti:sapphire laser in ZnSe crystal.
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Akinori Nishida, Akinori Nishida, Masahiro Nakata, Masahiro Nakata, Takafumi Oba, Takafumi Oba, Takeshi Higashiguchi, Takeshi Higashiguchi, Noboru Yugami, Noboru Yugami, Yasuhiko Sentoku, Yasuhiko Sentoku, Ryosuke Kodama, Ryosuke Kodama, } "THz wave up-frequency turning by rapidly plasma creation", Proc. SPIE 8119, Terahertz Emitters, Receivers, and Applications II, 81190L (7 September 2011); doi: 10.1117/12.892900; https://doi.org/10.1117/12.892900

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