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In situ frequency gating and beam splitting of vacuum- and extreme-ultraviolet pulses
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作者 Rajendran Rajeev johannes hellwagner +8 位作者 Anne Schumacher Inga Jordan Martin Huppert Andres Tehlar Bhargava Ram Niraghatam Denitsa Baykusheva Nan Lin Aaron von Conta Hans Jakob Wörner 《Light(Science & Applications)》 SCIE EI CAS CSCD 2016年第1期396-402,共7页
Monochromatization of high-harmonic sources has opened fascinating perspectives regarding time-resolved photoemission from all phases of matter.Such studies have invariably involved the use of spectral filters or spec... Monochromatization of high-harmonic sources has opened fascinating perspectives regarding time-resolved photoemission from all phases of matter.Such studies have invariably involved the use of spectral filters or spectrally dispersive optical components that are inherently lossy and technically complex.Here we present a new technique for the spectral selection of near-threshold harmonics and their spatial separation from the driving beams without any optical elements.We discover the existence of a narrow phase-matching gate resulting from the combination of the non-collinear generation geometry in an extended medium,atomic resonances and absorption.Our technique offers a filter contrast of up to 104 for the selected harmonics against the adjacent ones and offers multiple temporally synchronized beamlets in a single unified scheme.We demonstrate the selective generation of 133,80 or 56 nm femtosecond pulses from a 400-nm driver,which is specific to the target gas.These results open new pathways towards phase-sensitive multi-pulse spectroscopy in the vacuum-and extreme-ultraviolet,and frequencyselective output coupling from enhancement cavities. 展开更多
关键词 beam splitting below-threshold harmonics coherent extreme-ultraviolet pulses frequency gating non-collinear generation
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