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

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 μm were investigated. The beam quality factor M(2) of the harmonic beam generated in a 300-μm hollow fiber was found to be better than the gas jet usi...

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Veröffentlicht in:Optics express 2013-09, Vol.21 (18), p.20632-20640
Hauptverfasser: Igarashi, Hironori, Makida, Ayumu, Sekikawa, Taro
Format: Artikel
Sprache:eng
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Zusammenfassung: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 μm were investigated. The beam quality factor M(2) of the harmonic beam generated in a 300-μm 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-μm 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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.020632