We propose a cascade optical system for multifocusing ultrashort pulse beams. In this system, diffractive and refractive subsystems that are optically coupled in cascade correct chromatic aberrations, a phase plate compensates for angular dispersions, and material dispersions are removed by pre-chirping the input pulse. Achromaticity of the system is essential for simultaneous compensation of spatio-temporal pulse distortions. We designed a system by applying the aberration correction conditions derived from an ABCD-matrix analysis. The designed system was evaluated with 20-fs pulses by characterizing the transmitted pulses in beam width and pulse duration to verify the proposed distortion compensation scheme. This technology enables high-throughput ultrafast laser processing.
J. Amako and H. Nakano, "Distortion-compensated multifocusing of ultrashort pulse beams using a cascade optical system," Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 1052217 (Presented at SPIE LASE: January 30, 2018; Published: 19 February 2018); https://doi.org/10.1117/12.2288507.
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