Abstract
In order to improve high-harmonic generation efficiency, both reduction of the macroscopic phase mismatching between the pump and harmonic waves and increase of interaction length are crucial1. We have found that the phase matching can be achieved using hollow fiber by examining third-harmonic generation in a hollow fiber in room air2. The phase matching mechanism in the fiber is that a nonlinear refractive index change for the fundamental pulse compensates a dispersion induced by a free electrons. Also demonstrated was that a beam quality of the third harmonic was nearly single mode when it convened in a hollow fiber.
© 1998 IEEE
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