Generation and complete polarimetry of ultrashort circularly polarized extreme-ultraviolet pulses
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2022-04-25
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Journal Article
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Abstract
The generation of ultrashort circularly polarized pulses in the extreme-ultraviolet spectral range has recently attracted considerable interest for applications in time-resolved circular-dichroism experiments. Here, we demonstrate a simple approach to generate near-circularly polarized femtosecond pulses in the vacuum-ultraviolet. The ellipticity of the generated light can be continuously tuned from linear to near-circular, as demonstrated by detailed polarimetry measurements. Combining optical polarimetry with photoelectron circular-dichroism (PECD) measurements, we demonstrate a novel approach to characterizing the polarization state of light in terms of all four Stokes parameters. For photon energies of 9.3 eV, we obtained S3 = 0.96 ± 0.02 and a degree of polarization of 97±2%, i.e. the highest values reported from any harmonic-generation source so far. This source is directly applicable to circular-dichroism experiments, also enabling time-resolved PECD in the extreme-ultraviolet, a general approach to probing time-dependent chirality during chemical processes on (sub)-femtosecond time scales.
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published
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30 (9)
Pages / Article No.
14358 - 14367
Publisher
Optica
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03888 - Wörner, Hans Jakob / Wörner, Hans Jakob
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Funding
772797 - Attosecond X-ray spectroscopy of liquids (EC)
NCCR MUST (183615) - NCCR MUST Verteilfonds (SNF)
NCCR MUST (183615) - NCCR MUST Verteilfonds (SNF)