Abstract

We report a cascade optical system for multifocusing ultrashort pulse beams, particularly sub-50-fs pulses. System achromaticity is key to simultaneous compensation of the spatio–temporal pulse distortions. In this system, diffractive and refractive subsystems are optically coupled in cascade to correct chromatic aberrations, which are the primary cause of pulse distortion. We design a prototype system by applying achromatic conditions derived from an ABCD matrix analysis. The designed system is then evaluated using 20-fs pulses, by characterizing the transmitted pulses in terms of beam width and pulse duration; hence, the proposed distortion compensation scheme is validated. This pulse delivery system enables damage-free and high-throughput materials processing using ultrashort pulses.

© 2017 Optical Society of America

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