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Excitation of high-intensity terahertz surface waves under action of two-frequency laser radiation

A A Frolov2021年Plasma Physics and Controlled FusionIF 2.2出版社

The excitation of terahertz (THz) surface mode at oblique incidence of two-frequency laser radiation on semi-bounded plasma is studied. It is shown that if frequency difference of laser fields coincides with the surface eigenmode frequency, the significant increase surface wave (SW) field occurs. It is found that additional amplification of SW field occurs when the s- and p-polarized laser radiation is incident at the angle of total reflection. The SW energy flux density increases most significantly for p-polarized laser radiation when it is incident at the angle of total reflection on the near-critical plasma with rare electron collisions. It is shown that in this case the SW energy flux density can significantly exceed the laser intensity.

日本語訳

テラヘルツ(THz)表面モードの、半有界プラズマへの二周波レーザー放射の斜入射による励起について研究した。レーザー場の周波数差が表面モードの固有周波数と一致する場合、表面波(SW)場の顕著な増大が生じることが示された。s偏光およびp偏光のレーザー放射が全反射角で入射する場合、SW場のさらなる増幅が生じることが見出された。SWエネルギー流束は、電子衝突が稀な臨界密度付近のプラズマにp偏光レーザー放射が全反射角で入射する場合に最も顕著に増大する。この場合、SWエネルギー流束はレーザー強度を有意に超え得ることが示された。

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