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Generation of 12 fs deep-ultraviolet pulses by four-wave mixing through filamentation in neon gas

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Abstract

Generation of deep-ultraviolet femtosecond pulses by four-wave mixing through filamentation in neon gas was demonstrated. Fundamental (ω) and second-harmonic (2ω) pulses of 25fs Ti:sapphire amplifier output were focused into neon gas, and 20μJ pulses with the center wavelength of 260nm were produced by a four-wave mixing process, 2ω+2ωω3ω through an 15cm filament. Additionally, pulses with an energy of 2μJ at 200nm were generated, probably by a cascaded process, 3ω+2ωω4ω. The 260nm pulses were compressed by a grating-based compressor and characterized by a dispersion-free transient grating frequency-resolved optical gating. The estimated pulse width was 12fs.

© 2007 Optical Society of America

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