Helicity-selected near-circularly polarized attosecond pulses generated from mixed He-Ne gases
We present and theoretically demonstrate a method for generating helicity-selected near-circularly polarized attosecond pulses in mixed He-Ne gases using bichromatic counter-rotating circularly polarized (BCCP) fields. High-order harmonics driven by BCCP fields exhibit circular polarization for indi...
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Main Authors | , , , , , , |
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Format | Journal Article |
Language | English |
Published |
29.09.2024
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Subjects | |
Online Access | Get full text |
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Summary: | We present and theoretically demonstrate a method for generating
helicity-selected near-circularly polarized attosecond pulses in mixed He-Ne
gases using bichromatic counter-rotating circularly polarized (BCCP) fields.
High-order harmonics driven by BCCP fields exhibit circular polarization for
individual orders in the frequency domain, but adjacent orders have opposite
helicities. By utilizing the He-Ne mixture, we select only one helical
component of the harmonics, resulting in the generation of highly elliptically
polarized attosecond pulses in the time domain. Our analyses based on the
quantum-orbit theory and the strong field approximation further clarify that
the polarization of attosecond pulses is governed by the interference mechanism
of high-order harmonics emitted by He and Ne. This combination of BCCP fields
and an atomic mixture which requires no alignment in experiments, significantly
simplifies the generation of elliptically polarized harmonics dominated by one
helical component, thereby paving the way for an efficient and robust method to
generate bright attosecond pulses with large ellipticity. |
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DOI: | 10.48550/arxiv.2409.19661 |