Pressure-dependent phase matching for high harmonic generation of Ar and N 2 in the tight focusing regime

Niu, Yong; Liu, Fangyuan; Liu, Yi; Liang, Hongjing; Yang, Yu-Jun; Ma, R.; Ding, Dajun

doi:10.1016/j.optcom.2017.03.059

Cited by 13 publications

(7 citation statements)

References 35 publications

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“…Previous studies have shown that the Gaussian driving beam phase gradient ∆k g and the atomic dipole phase ∆k d play a major role in the harmonic phase matching under the 300-mm tight focus conditions. [43] Meanwhile, the atomic dipole phase of the emitted radiation depends on the local intensity and different atoms are exposed to different local intensities of a vortex beam. It is necessary to introduce a supernumerary focal phase term ∆k f due to the zero intensity at the vortex beam axis.…”

Section: Resultsmentioning

confidence: 99%

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

Xiao 肖,

Zhao 赵,

Cheng 程

et al. 2024

Chinese Phys. B

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In high harmonic generation (HHG), Laguerre-Gaussian (LG) beams are used to generate extreme ultraviolet (XUV) vortices with well-defined orbital angular momentum (OAM), which have potential applications in fields such as microscopy and spectroscopy. We conducted an experimental study on the HHG driven by vortex and Gaussian beams. We found that the intensity of vortex harmonics was positively correlated with the laser energy and gas pressure. The structure and intensity distribution of the vortex harmonics exhibit significant dependence on the relative position between the gas jet and the laser focus. The ring-like structures observed in the vortex harmonics, and the interference of quantum paths provide an explanation for the distinct structural characteristics. Moreover, by adjusting the relative position between the jet and laser focus, it is possible to discern the contributions from different quantum paths. The optimization of the HH vortex field is applicable to the XUV, which opens new avenues for exploiting the potential in optical spin or manipulating electrons using the photon with tunable orbital angular momentum.

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Section: Resultsmentioning

confidence: 99%

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

Xiao 肖,

Zhao 赵,

Cheng 程

et al. 2024

Chinese Phys. B

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“…Then a homemade XUV spectrometer is used to collect harmonics as described in our previous researches. [7,40,41] The intensity of the driving laser is controlled by a neutral density filter (ND). The elliptically polarized driving laser is adjusted by a zeroorder half-wave plate (HWP) placed in front of a zero-order quarter-wave plate (QWP).…”

Section: Methodsmentioning

confidence: 99%

Elliptically polarized high-order harmonic generation of Ar atom in an intense laser field

Hu 胡,

Wang 王,

Jing 景

et al. 2024

Chinese Phys. B

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We have conducted experimental investigations on the high-order harmonic generation (HHG) of Ar atom in an elliptically polarized intense laser field. Interestingly, we observe an anomalous dependence on the laser ellipticity (ε) in the lower-order harmonics, specifically in the 13rd-order, which displayed maximal harmonic intensity at ε ≈ 0.1, rather than at ε = 0 as expected. This contradicts the general trend of harmonic yield, which typically decreases with the increase of laser ellipticity. In this study, we attribute this phenomenon to the disruption of the symmetry of the wave function by the Coulomb effect, leading to the generation of a harmonic with high ellipticity. This finding provides valuable insights into the behavior of elliptically polarized harmonics and offers a potential avenue for exploring new applications in ultrafast spectroscopy and light-matter interactions.

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“…The experimental setup used for generation and detection of HHG has already been described in our previous work. [32][33][34] Briefly, a Ti: sapphire laser system operating at 1 kHz repetition was used to deliver ∼ 35 fs pulses centered at 800 nm. The output pulse is divided into two parts by using a 30 : 70 beam splitter.…”

Section: Methodsmentioning

confidence: 99%

Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide*

et al. 2019

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We investigate experimentally multi-orbital effects in high-order harmonic generation (HHG) from aligned CO2 and N2O molecules by intense femtosecond laser fields with linear and elliptical polarizations. For either of the aligned molecules, a minimum in the harmonic spectrum is observed, the position of which shifts to lower-order harmonics when decreasing the intensity or increasing the ellipticity of the driving laser. This indicates that the minimum originates from the dynamic interference of different channels, of which the tunneling ionization and recombination are contributed via different molecular orbitals. The results show that both the highest occupied molecular orbital (HOMO) and low-lying HOMO-2 in CO2 (or HOMO-1 in N2O) contribute to the molecular HHG in both linearly and elliptically polarized strong laser fields. Our study would pave a way for understanding multi-electron dynamics from polyatomic molecules irradiated by strong laser fields.

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Pressure-dependent phase matching for high harmonic generation of Ar and N 2 in the tight focusing regime

Cited by 13 publications

References 35 publications

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

Elliptically polarized high-order harmonic generation of Ar atom in an intense laser field

Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide*

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