Directional enhancement of selected high-order-harmonics from intense laser irradiated blazed grating targets

Zhang, Guo-Bo; Chen, Min; Liu, Feng; Yuan, Xiaohui; Weng, Shangkun; Zheng, Jian; Ma, Yunlong; Shao, F. Q.; Sheng, Zheng-Ming; Zhang, Jie

doi:10.1364/oe.25.023567

Cited by 10 publications

(8 citation statements)

References 41 publications

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“…While many an investigation has been carried out to control the temporal structure of the harmonics, e.g., to obtain an isolated single attosecond pulse [10][11][12][13], methods to control the HHG spectrum remain limited. Among the reported spectral control schemes, selected enhancement of HHG has been achieved by modifying the plasma density ramp [14] or plasma surface morpha [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Spectral control of high harmonics from relativistic plasmas using bicircular fields

Chen

2018

Phys. Rev. E

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We introduce two-color counterrotating circularly polarized laser fields as a way to spectrally control high harmonic generation (HHG) from relativistic plasma mirrors. Through particle-in-cell simulations, we show that only a selected group of harmonic orders can appear owing to the symmetry of the laser fields and the related conservation laws. By adjusting the intensity ratio of the two driving field components, we demonstrate the overall HHG efficiency, the relative intensity of allowed neighboring harmonic orders, and that the polarization state of the harmonic source can be tuned. The HHG efficiency of this scheme can be as high as that driven by a linearly polarized laser field.

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Section: Introductionmentioning

confidence: 99%

Spectral control of high harmonics from relativistic plasmas using bicircular fields

Chen

2018

Phys. Rev. E

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“…When using flat targets, both the intense laser light and the broadband XUV beam are reflected in the specular direction. On the other hand, grating targets have been investigated for the possibility to angularly separate the harmonic orders [11][12][13][14][15][16], as well as to discriminate the XUV beam from the fundamental laser frequency, whose intensity otherwise dominates the spectrum. Such a diffracting system would be beneficial for the realization of near-monochromatic sources to be applied in photoelectron spectroscopy or coherent diffraction imaging [17].…”

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confidence: 99%

Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons

et al. 2018

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The emission of high-order harmonics in the extreme ultraviolet range from the interaction of a short, intense laser pulse with a grating target is investigated experimentally. When resonantly exciting a surface plasmon, both the intensity and the highest order observed for the harmonic emission along the grating surface increase with respect to a flat target. Harmonics are obtained when a suitable density gradient is preformed at the target surface, demonstrating the possibility to manipulate the grating profile on a nanometric scale without preventing the surface plasmon excitation. In support of this, the harmonic emission is spatiotemporally correlated to the acceleration of multi-MeV electron bunches along the grating surface. Particle-in-cell simulations reproduce the experimental results and give insight on the mechanism of high harmonic generation in the presence of surface plasmons.

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“…To this aim, the blaze angle is chosen in order that the incident light is locally reflected in the same direction as the diffraction angle. In the high intensity regime, blazed gratings have been used to optimize high harmonic generation 42,43 (section IV).…”

Section: Source Optimization With Blazed Gratingsmentioning

confidence: 99%

“…Whatever the details of the generation mechanism, from a flat surface the HHs are emitted in the specular direction, collinear to the reflected light at the first fundamental harmonic. Foreseen applications of the HHs may require their angular separation, which has been achieved using grating targets 42,43,46,47 so that each HH is emitted at angles φ mn determined by the grating equation:…”

Section: High Harmonic Generation a Experimental Observationmentioning

confidence: 99%

Extreme high field plasmonics: Electron acceleration and XUV harmonic generation from ultrashort surface plasmons

et al. 2019

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Experiments on the excitation of propagating surface plasmons (SPs) by ultrashort, high intensity laser interaction with grating targets are reviewed. At intensities exceeding 10 19 W cm −2 on target, i.e. in the strongly relativistic regime of electron dynamics, multi-MeV electrons are accelerated by the SP field as dense bunches collimated in a near-tangent direction. By the use of a suitable blazed grating, the bunch charge can be increased up to ≈660 picoCoulomb. Intense XUV high harmonics (HHs) diffracted by the grating are observed when a plasma with sub-micrometer scale is produced at the target surface by a controlled prepulse. When the SP is excited, the HHs are strongly enhanced in a direction quasi-parallel to the electrons. Simulations suggest that the HHs are boosted by nanobunching in the SP field of the electrons which scatter the laser field. Besides the static and dynamic tailoring of the target density profile, further control of electron and HH emission might be achieved by changing the SP duration using a laser pulse with rotating wavefront. This latter technique may allow to produce nearly single-cycle SPs.

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Directional enhancement of selected high-order-harmonics from intense laser irradiated blazed grating targets

Cited by 10 publications

References 41 publications

Spectral control of high harmonics from relativistic plasmas using bicircular fields

Spectral control of high harmonics from relativistic plasmas using bicircular fields

Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons

Extreme high field plasmonics: Electron acceleration and XUV harmonic generation from ultrashort surface plasmons

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