Compression of harmonic pulses by using material dispersion |
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| Authors: | Email author" target="_blank">KT?KimEmail author CM?Kim MG?Baik G?Umesh CH?Nam |
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| Institution: | (1) Department of Physics and Coherent X-ray Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Korea;(2) Department of Physics, Kyungwon University, Seongnam, Gyeonggi-do, 461-701, Korea |
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| Abstract: | We utilize the dispersion property of an X-ray filter material for the generation of a single sub-50-as pulse from high-order harmonics. The attosecond pulse, formed by selecting the spectral range of high-order harmonic radiation, contains an intrinsic chirp corresponding to the quadratic phase variation during a half cycle of a laser pulse. We show that this chirp can be compensated by using the negative group-delay dispersion of a thin X-ray filter, compressing the attosecond pulse down to sub-50-as. PACS 42.65.Re; 42.50.Hz; 42.65.Ky |
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