21 October 1999 Phase-matched high-order-harmonic generation by self-guided intense femtosecond laser pulses
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We describe the phase-matched high-order-harmonic generation of femtosecond Ti:sapphire laser pulses in a self-guiding channel. Generation efficiency of the high-order harmonic was improved by phase-matched propagation in the guiding channel. The harmonics around the 49th harmonic (16 nm) were enhanced by two orders of magnitude compared to those in the plateau with a 7-mm-long, self-guided pulse in Ne. High- harmonic conversion efficiency of 10-6 was obtained, producing > nJ harmonics in the cutoff region around the 49th harmonic. The results are well explained by considering both the intrinsic phase based on the single-atom response and the macroscopic phase matching in the high-intensity interaction region.
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Katsumi Midorikawa, Katsumi Midorikawa, Yusuke Tamaki, Yusuke Tamaki, Jiro Itatani, Jiro Itatani, Minoru Obara, Minoru Obara, } "Phase-matched high-order-harmonic generation by self-guided intense femtosecond laser pulses", Proc. SPIE 3776, Soft X-Ray Lasers and Applications III, (21 October 1999); doi: 10.1117/12.366683; https://doi.org/10.1117/12.366683

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