Genetic-algorithm retrieval of the molecular alignment distribution with high-order harmonics generated from transiently aligned 
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 molecules

Jiang, Changzhi; Jiang, Haoran; Chen, Yanbo; Li, Baochang; Lin, C. D.; Jin, Cheng

doi:10.1103/physreva.105.023111

Cited by 6 publications

(3 citation statements)

References 86 publications

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“…The high-order harmonic signal measured in the macroscopic molecular ensemble in the laboratory frame is a convolution of the single molecular signal with the alignment distribution. [43,44] To more precisely study the influence of the alignment effect on harmonic ellipticity, we calculate the molecular alignment distribution to exclude ambiguity due to imperfect alignment. In our calculation, we set the alignment degree cos 2 θ = 0.65, which can be easily achieved in the experiment.…”

Section: -3mentioning

confidence: 99%

Elliptically polarized high-order harmonic generation in nitrogen molecules with cross-linearly polarized two-color laser fields

Zhai

Qin

et al. 2023

Chinese Phys. B

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Circularly and elliptically polarized high-order harmonics have unique advantages when used in studying the chiral and magnetic features of matters. Here, we studied the polarization properties of high-order harmonic generated from alignment nitrogen molecules driven by cross-linearly-polarized two-color laser fields. Through adjusting various laser parameters and targets, such as the relative phase, the crossing angle, the intensity ratio of driving fields, and the molecular alignment angle, we obtained highly elliptically polarized high-order harmonics with the same helicity in a wide spectral range. It provides a possible and effective way to generate elliptically polarized attosecond pulses. Finally, we show the probability of controlling the spectral range of elliptically polarized harmonics.

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Section: -3mentioning

confidence: 99%

Elliptically polarized high-order harmonic generation in nitrogen molecules with cross-linearly polarized two-color laser fields

Zhai

Qin

et al. 2023

Chinese Phys. B

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“…To date, several methods have been reported to measure molecular rotational temperature in experiment, for instance, using the coherent anti-Stokes Raman scattering (CARS) [28][29][30] and degenerate four-wave mixing (DFWM) [31] processes and also using the Fourier spectrum of time-dependent HHG signals [32] . A simultaneous measurement of molecular rotational temperature and pump laser intensity is also demonstrated from the HHG signals [33][34][35] and the molecular alignment echo measurement [36] . However, these methods are still limited by their inherent restrictions.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

中国光学快报

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We demonstrate a deep-learning neural network (DNN) method for the measurement of molecular alignment by using the molecular-alignment-based cross-correlation polarization-gating frequency resolved optical gating (M-XFROG) technique. Our network has the capacity for direct measurement of molecular alignment from the FROG traces. In a proof-of-principle experiment, we have demonstrated our method in O 2 molecules. With our method, the molecular alignment factor hcos 2 θi(t) of O 2 , impulsively excited by a pump pulse, was directly reconstructed. The accuracy and validity of the reconstruction have been verified by comparison with the simulations based on experimental parameters.

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“…[52] Jiang et al investigated the HHG from the aligned CO 2 molecule driven by a linearly polarized laser and found that the molecular polarization can be determined by the harmonic polarization state. [53] Son et al studied elliptically polarized high-order harmonics from aligned molecules irradiated by a linearly polarized driving field, and the physical mechanism of elliptically polarized harmonics is the amplitude and phase of harmonics. [54] However, the generation of elliptically polarized high-order harmonics, modulation of polarization characteristics, and basic principles of molecules driven by linearly polarized lasers must be studied.…”

Section: Introductionmentioning

confidence: 99%

Amplitude and rotation of the ellipticity of harmonics from a linearly polarized laser field

Li¹,

Gao²,

Yu³

et al. 2022

Chinese Phys. B

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We simulate the dynamic response of $\mathrm{H}_{2}^{+}$ in a linearly polarized laser field by numerically solving the time-dependent Schrödinger equation (TDSE). The elliptically polarized high-order harmonics generated by $\mathrm{H}_{2}^{+}$ irradiated by the linearly polarized laser field is systematically investigated. It is found that the amplitude and rotation of the ellipticity of harmonics are affected by the alignment angle and internuclear distance of molecule, and by analyzing the change of the forces acted on the ionized electrons and the trajectories of the electrons, the phenomena are resulted from the change in the direction of the total coulomb forces from the two nuclear felt by the re-collided ionized electrons in the direction perpendicular to laser polarization direction. According to the influence law, we can select the harmonics with specific frequency band under different alignment angles, then synthesize the isolated attosecond pulses with different rotation, which can be continuously converted from right-handed circular polarization, linear polarization and left-handed circular polarization with the change of the alignment angle. It provides a new possible approach to the real-time detection of molecular states by attosecond pulses and obtaining more optimized harmonics by molecular properties.

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Genetic-algorithm retrieval of the molecular alignment distribution with high-order harmonics generated from transiently aligned CO2 molecules

Cited by 6 publications

References 86 publications

Elliptically polarized high-order harmonic generation in nitrogen molecules with cross-linearly polarized two-color laser fields

Elliptically polarized high-order harmonic generation in nitrogen molecules with cross-linearly polarized two-color laser fields

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Amplitude and rotation of the ellipticity of harmonics from a linearly polarized laser field

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