Quantum path selection and control in high-order harmonic generation using a spatially shaped laser beam

Liu, Peng; Zhang, Zhinan; Li, Yuexun; Zhao, Shitong; Li, Xiaofang; Li, Ruxin; Xu, Zhizhan

doi:10.1103/physreva.79.063823

Cited by 13 publications

(12 citation statements)

References 32 publications

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“…We observe interferences both in the harmonic spectra as a function of intensity and in the spatial far-field profiles. Similar effects have been previously observed and interpreted as QPIs [5,7,[10][11][12][13][14][15][16][17][18]. Using an analytical model as well as numerical simulations, we show that these interferences occur due to the temporal variation of the phase matching conditions [19,20] for only one (the long) quantum path.…”

supporting

confidence: 83%

Spectrally Resolved Maker Fringes in High-Order Harmonic Generation

et al. 2011

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We investigate macroscopic interference effects in high-order harmonic generation using a Ti:sapphire laser operating at a 100 kHz repetition rate. The structure and behavior of spectral and spatial interference fringes are explained and analytically described by transient phase matching of the long electron trajectory contribution. Time-frequency mapping due to the temporal chirp of the harmonic emission allows us to observe Maker fringes directly in the spectral domain.

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supporting

confidence: 83%

Spectrally Resolved Maker Fringes in High-Order Harmonic Generation

et al. 2011

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“…The interference fringes allow to retrieve even more information about electron motion with high precision. However, because the singleatom and macroscopic phase-matching effects are naturally coupled in HHG process, the mechanisms underlying the interference and spectral features are always entangled and sometimes the interpretation is different or confusing even for the similar observations [24,[28][29][30][31][32][33]. Experimental investigations of fully resolved HHG with both spatiotemporal and spectral features will shed more light on these issues.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, each path has a specific excursion time and frequency property and it leads to a mapping between time and frequency for each harmonic [22] which has also been used to detect the nuclear dynamics [23]. On the other hand, the quantum paths can interfere with each other, resulting in frequency splitting [24][25][26][27][28] and interference fringes [29][30][31] in the harmonic spectra and also laser intensity-dependent interference of harmonic yield [32][33][34][35][36][37][38]. The interference fringes allow to retrieve even more information about electron motion with high precision.…”

Section: Introductionmentioning

confidence: 99%

Spectrally resolved spatiotemporal features of quantum paths in high-order-harmonic generation

Lan

Zhang

et al. 2015

Phys. Rev. A

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We experimentally disentangle the contributions of different quantum paths in high-order harmonic generation (HHG) from the spectrally and spatially resolved harmonic spectra. By adjusting the laser intensity and focusing position, we simultaneously observe the spectrum splitting, frequency shift and intensity-dependent modulation of harmonic yields both for the short and long paths. Based on the simulations, we discriminate the physical mechanisms of the intensity-dependent modulation of HHG due to the quantum path interference and macroscopic interference effects. Moreover, it is shown that the atomic dipole phases of different quantum paths are encoded in the frequency shift. In turn, it enables us to retrieve the atomic dipole phases and the temporal chirps of different quantum paths from the measured harmonic spectra. This result gives an informative mapping of spatiotemporal and spectral features of quantum paths in HHG.

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“…1). However, quantum path calculations predict a shift of the harmonic lines from their original position as well as their significant spectral broadening [11,12].…”

Section: Hhg and Quantum Path Controlmentioning

confidence: 99%