Temporal phase control of soft-x-ray harmonic emission
Abstract
We report a strong dependence of the soft-x-ray spectra generated by high harmonic emission on the chirp of the excitation pulse, when an ultrashort laser drives the process. For identical pulse durations, distinct harmonic peaks can be observed for positively chirped excitation pulses, while for negatively chirped pulses, the harmonic peaks become irregular. This behavior is explained by simulations that combine the chirp of the laser with the intrinsic phase shift of the harmonics. This work resolves an outstanding discrepancy between theory and experiment by demonstrating that high-order harmonic generation driven by short-duration pulses can result in distinct harmonic peaks. This work conclusively demonstrates the role of the intrinsic phase in determining harmonic emission spectra, and control this phase during the emission process.
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The dynamics of the HHG process itself represent the inception of attosecond science, where sub-optical cycle dynamics drives the physics, and the physics intrinsically drives the HHG process toward shorter, rather than longer, pulses.
“However, the implications have been profound-the dynamics of the process itself not only represent the inception of attosecond science [125, 126], where sub-optical cycle dynamics drives the physics, but also where the physics intrinsically drives the HHG process toward shorter, rather than longer, pulses.”
From Roadmap of ultrafast x-ray atomic and molecular physics (2018) · cites this paper as [125]
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Shaped-pulse optimization of coherent emission of high-harmonic soft X-rays
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Self-citationRoadmap of ultrafast x-ray atomic and molecular physics
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Self-citation
- Authors
- Chang, Z., Rundquist, A., Wang, H., Christov, I., Kapteyn, H. C., & Murnane, M. M.
- Affiliations
- University of Michigan (US)
- Venue
- Physical Review A
- Publisher
- American Physical Society (APS)
- Published
- 1998-07-01
- Volume
- 58
- Issue
- 1
- Pages
- R30-R33
- ISSN
- 0556-2791 (ISSN-L)
- 1050-2947
- 1094-1622
- OpenAlex
- W1967693972
- Cited by
- 181
- References
- 20
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 2 · 2023: 5 · 2022: 5 · 2021: 3 · 2020: 3 · 2019: 4 · 2018: 13 · 2017: 4 · 2016: 8 · 2015: 3 · 2014: 3 · 2013: 5 · 2012: 8
- FWCI
- 4.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review A (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Physical Sciences › Physics and Astronomy › Radiation › Advanced X-ray Imaging Techniques
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Atomic and Molecular Physics
- Keywords
- high harmonic generation, pulse chirp, ultrashort laser pulses, harmonic spectrum, attosecond science
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