Generation of an Extreme Ultraviolet Supercontinuum in a Two-Color Laser Field
Zhinan ZengState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, P. O. Box 800-211, Shanghai 201800, ChinaYa ChengState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, P. O. Box 800-211, Shanghai 201800, ChinaXiaohong SongState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, P. O. Box 800-211, Shanghai 201800, ChinaRuxin LiState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, P. O. Box 800-211, Shanghai 201800, ChinaZhizhan XuState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, P. O. Box 800-211, Shanghai 201800, China
2007en
ABI
Аннотация
We theoretically investigate the high-order harmonic generation in a helium atom with a two-color optical field synthesized by an intense 6 fs pulse at 800 nm and a relatively weak 21.3 fs pulse at 400 nm. When the frequency-doubled pulse is properly time shifted with respect to the fundamental pulse, an ultrabroad extreme ultraviolet supercontinuum spectrum with a 148 eV spectral width can be generated which directly creates an isolated 65 as pulse even without phase compensation. We explain this extraordinary phenomenon by analyzing maximum electron kinetic energies at different return times.
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