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 duration2’3. 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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