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  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QPD5

Phase-matching of high-order harmonic generation in capillary waveguides

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Abstract

High-order harmonic generation of ultrashort pulses has been demonstrated to upconvert laser light to >450eV1, yielding coherent x-ray pulses that are possibly sub-femtosecond in duration23. However, its use in experiments and applications is limited by low conversion efficiency. In recent work4, we demonstrated a new technique for efficient (~20%) phase-matched frequency conversion of ultrashort laser pulses to the ultraviolet in a gas-filled capillary waveguide. Here we demonstrate phase-matching of high-order harmonic generation3, and obtain a conversion efficiency in the XUV that is 100-1000 times greater than in previous gas-jet experiments^. The high peak and average flux of this source (which operates at 1 kHz), along with its small scale and experimental practicality, will enable a wide variety of new experimental investigations in linear and nonlinear x-ray science.

© 1998 Optical Society of America

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