| 1. |
- Ma, Guangjin, et al.
(författare)
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Isolated attosecond light pulse generation from plasma surfaces at varying laser intensities and incidence angles
- 2022
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Ingår i: 1st International Conference on UltrafastX 2021. - : SPIE - International Society for Optical Engineering.
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Konferensbidrag (refereegranskat)abstract
- Harmonics from relativistic laser driven plasma surfaces is a prospective high energy attosecond light source infuture XUV pump-probe experiments. Among all the schemes, the most ecient and direct way to realize anisolated attosecond pulse is through using a few-cycle laser as the driving pulse. The two goodness criteria: thelaser to harmonics energy conversion eciency and the \purity" of an isolated attosecond pulse are generallydetermined by a combination of interaction parameters. Through using particle-in-cell simulations and relativisticelectron dynamics model analyses, we explain how these two criteria are a ected by the laser intensity, incidenceangle, carrier-envelope phase, and the plasma scale length. We found that, there exist an optimal plasma scalelength and an optimal incidence angle to eciently generate harmonics and intense attosecond light pulses.When other parameters are xed, using a moderately intense relativistic laser or using a large incidence anglecould result in a higher isolation degree as well as a broader range of controlling parameters to realize an isolatedattosecond light pulse.
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| 2. |
- Ma, Guangjin, et al.
(författare)
-
Laser intensity and incidence angle dependent attosecond light pulse generation from relativistic laser plasma surfaces
- 2022
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Ingår i: Sixth international symposium on laser interaction with matter (LIMIS 2022). - : SPIE - International Society for Optical Engineering.
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Konferensbidrag (refereegranskat)abstract
- Relativistic high-order harmonics from a few-cycle laser driven plasma surface is a very promising source of anintense and isolated attosecond light pulse. The laser to harmonics conversion efficiency and the “purity” ofan isolated attosecond light pulse are generally determined by a combination of interaction parameters, suchas laser intensities, incidence angles, pulse durations, carrier-envelope phases and plasma scale lengths. Wehad already previously investigated the effect of a three-parameter combination of the laser pulse duration,the carrier-envelope phase and the plasma scale length. To complement our previous work, the parametricdependence of the other two three-parameter combinations: the carrier-envelope phase, the plasma scale length,either combined with the laser intensity or the incidence angle, were systematically investigated through onedimensional particle-in-cell simulations. We found that, although the impact of parameter combinations onattosecond pulse generations is generally complicated, there exist however an optimal plasma scale length and anoptimal incidence angle to efficiently generate high-order harmonics and intense attosecond light pulses. Whenother parameters are fixed, a moderately intense relativistic laser is more advantageous to realize an isolatedattosecond light pulse in a broad controlling parameters range. And a larger incidence angle favors a higherisolation degree as well as a broader range of controlling parameters towards the generation of intense isolatedattosecond light pulses. In order to interpret these simulation results, we have modeled the correspondingrelativistic electron dynamics, using which the underlying physics are discussed.
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