Abstract-Longitudinal terahertz wave generation from an air plasma filament induced by a femtosecond laser

Yasuo Minami, Takayuki Kurihara, Keita Yamaguchi, Makoto Nakajima, and Tohru Suemoto

http://apl.aip.org/resource/1/applab/v102/i15/p151106_s1?isAuthorized=no

We have generated and detected a longitudinally polarized (Z-polarized) terahertz (THz) wave by focusing a conically propagating THz beam generated from a plasma filament induced by a femtosecond laser pulse. In the experiment, we observed a radially polarized field in a collimated region and Z-polarized field at focus in the time domain. The maximum value of the Z-polarized THz electric field reached 1.0 kV/cm. It was also quantitatively discussed about the Z-polarized field and the radial field at the focal point. We expect this technique to find application in THz time domain spectroscopy.

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