Electron trajectory selection for high harmonic generation inside a short hollow fiber

Igarashi, Hironori, Makida, Ayumu, Sekikawa, Taro

doi:10.1364/oe.21.020632

Description

The 19th harmonic beam divergences from a Ti: sapphire laser generated using a gas jet and 10-mm-long hollow fibers with bore diameters of 300 and 200 mu m were investigated. The beam quality factor M-2 of the harmonic beam generated in a 300-mu m hollow fiber was found to be better than the gas jet using the phase match including the atomic dipole phase induced by the short trajectory. On the other hand, a 200-mu m hollow fiber was found to generate a more divergent beam with a larger M-2 because of the long trajectory. The electron trajectory contributing to high harmonic generation was selected using the phase-matching process inside a short hollow fiber. (C) 2013 Optical Society of America

Journal

Optics express

Optics express 21 (18), 20632-20640, 2013-09-09

Optical soc amer