期刊
SCIENCE ADVANCES
卷 6, 期 16, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay2802
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [16K13704, 17H01067]
- RIKEN
- Matsuo Foundation
- MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) grant [JP-MXS0118068681]
- Deutsche Forschungsgemeinschaft [SPP1840 SOLSTICE]
- National Key Research and Development Program [2017YFE0116600]
- National Natural Science Foundation of China [91950202]
- Grants-in-Aid for Scientific Research [17H01067, 16K13704] Funding Source: KAKEN
A stable 50-mJ three-channel optical waveform synthesizer is demonstrated and used to reproducibly generate a high-order harmonic supercontinuum in the soft x-ray region. This synthesizer is composed of pump pulses from a 10-Hz repetition-rate Ti:sapphire pump laser and signal and idler pulses from an infrared two-stage optical parametric amplifier driven by this pump laser. With full active stabilization of all relative time delays, relative phases, and the carrier-envelope phase, a shot-to-shot stable intense continuum harmonic spectrum is obtained around 60 eV with pulse energy above 0.24 mu J. The peak power of the soft x-ray continuum is evaluated to be beyond 1 GW with a 170-as transform limit duration. We found a characteristic delay dependence of the multicycle waveform synthesizer and established its control scheme. Compared with the one-color case, we experimentally observe an enhancement of the cutoff spectrum intensity by one to two orders of magnitude using three-color waveform synthesis.
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