Regulation of continuum harmonic generation by using near-infrared chirped pulses
Keywords:near-infrared chirped laser, multiple rescatterings, continuum harmonics, asymmetric molecules
It has been known that the broadband of continuum harmonics, a regular periodicity or a wide smooth range, is essential for generating attosecond pulses. However, the high-order rescatterings of electrons (HOR) can significantly affect this important part of high-order harmonic spectra. In the present work, we apply the method suggested in our previous studies to limit the HOR effect on the continuum harmonics by using up-chirped pulses with frequency increasing in time to regulate the high-order harmonic generation of an asymmetric molecule such as CO subjected to a near-infrared laser. To do so, we numerically calculate the high-order harmonic spectra using the time-dependent wave functions obtained within the framework of the single-active electron approximation. To analyze and regulate the HOR effect, we use the time-frequency analysis together with the kinetic energy maps obtained from the equation of electron motion in the laser electric field. These techniques reveal the high-order harmonic dynamics, especially the effect of chirped pulse on the manifestation of continuum harmonics. Based on this, we release the notice on choosing appropriate parameters to obtain the optimal continuum range of harmonics. Although the detailed analysis is given for the CO molecule, the method suggested is applicable for other polar molecules.
A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre et al., Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases, J. Opt. Soc. Am. B 4 (1987) 595.
P. B. Corkum, Plasma perspective on strong field multiphoton ionization, Phys. Rev. Lett. 71 (1993) 1994.
M. Lewenstein, P. Balcou, M. Y. Ivanov, A. L’Huillier and P. B. Corkum, Theory of high-harmonic generation by low-frequency laser fields, Phys. Rev. A 49 (1994) 2117.
C. Hernández-Garcı́a, J. A. Perez-Hernandez, T. Popmintchev, M. M. Murnane, H. C. Kapteyn, A. Jaron-Becker et al., Zeptosecond high harmonic keV x-ray waveforms driven by midinfrared laser pulses, Phys. Rev. Lett. 111 (2013) 033002.
L. He, Y. Li, Z. Wang, Q. Zhang, P. Lan and P. Lu, Quantum trajectories for high-order-harmonic generation from multiple rescattering events in the long-wavelength regime, Phys. Rev. A 89 (2014) 053417.
P.-C. Li, Y.-L. Sheu, H. Z. Jooya, X.-X. Zhou and S.-I. Chu, Exploration of laser-driven electron-multirescattering dynamics in high-order harmonic generation, Scientific Reports 6 (2016) 32763.
C.-P. Zhang, Y.-N. Pei, C.-L. Xia, X.-F. Jia and X.-Y. Miao, Theoretical research on multiple rescatterings in the process of high-order harmonic generation from a helium atom with a long wavelength, Laser Physics Letters 14 (2016) 015301.
C.-T. Le, N.-L. Phan, D. D. Vu, C. Ngo and V.-H. Le, Effect of multiple rescatterings on continuum harmonics from asymmetric molecules in multicycle lasers, Phys. Chem. Chem. Phys. 24 (2022) 6053.
W. Hong, P. Lu, W. Cao, P. Lan and X. Wang, Control of quantum paths of high-order harmonics and attosecond pulse generation in the presence of a static electric field, J. Phys. B: At. Mol. Opt. Phys. 40 (2007) 2321.
M. R. Miller, C. Hernández-Garcı́a, A. Jaroń Becker and A. Becker, Targeting multiple rescatterings through vuv-controlled high-order-harmonic generation, Phys. Rev. A 90 (2014) 053409.
J. J. Carrera, X. M. Tong and S.-I. Chu, Creation and control of a single coherent attosecond xuv pulse by few-cycle intense laser pulses, Phys. Rev. A 74 (2006) 023404.
B. Zhang, J. Yuan and Z. Zhao, Dynamic core polarization in strong-field ionization of CO molecules, Phys. Rev. Lett. 111 (2013) 163001.
B. Zhang, J. Yuan and Z. Zhao, Dynamic orbitals in high-order harmonic generation from CO molecules, Phys. Rev. A 90 (2014) 035402.
V.-H. Hoang, S.-F. Zhao, V.-H. Le and A.-T. Le, Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules, Phys. Rev. A 95 (2017) 023407.
C.-T. Le, V.-H. Hoang, L.-P. Tran and V.-H. Le, Effect of the dynamic core-electron polarization of CO molecules on high-order harmonic generation, Phys. Rev. A 97 (2018) 043405.
M. Abu-samha and L. B. Madsen, Effect of multielectron polarization in the strong-field ionization of the oriented CO molecule, Phys. Rev. A 101 (2020) 013433.
H. T. Nguyen, K.-N. H. Nguyen, N.-L. Phan, C.-T. Le, D. Vu, L.-P. Tran et al., Imprints of multielectron polarization effects in odd-even harmonic generation from co molecules, Phys. Rev. A 105 (2022) 023106.
M. Abu-samha and L. B. Madsen, Multielectron effects in strong-field ionization of the oriented ocs molecule, Phys. Rev. A 102 (2020) 063111.
C.-T. Le, D.-D. Vu, C. Ngo and V.-H. Le, Influence of dynamic core-electron polarization on the structural minimum in high-order harmonics of co 2 molecules, Phys. Rev. A 100 (2019) 053418.
Z. Zhao and J. Yuan, Dynamical core polarization of two-active-electron systems in strong laser fields, Phys. Rev. A 89 (2014) 023404.
K. Burnett, V. C. Reed, J. Cooper and P. L. Knight, Calculation of the background emitted during high-harmonic generation, Phys. Rev. A 45 (1992) 3347.
M. Abu-samha and L. B. Madsen, Single-active-electron potentials for molecules in intense laser fields, Phys. Rev. A 81 (2010) 033416.
H. Bachau, E. Cormier, P. Decleva, J. E. Hansen and F. Martı́n, Applications of B-splines in atomic and
molecular physics, Rep. Prog. Phys. 64 (2001) 1815.
Y.-l. Sheu, L.-Y. Hsu, H.-t. Wu, P.-C. Li and S.-I. Chu, A new time-frequency method to reveal quantum dynamics of atomic hydrogen in intense laser pulses: Synchrosqueezing transform, AIP Advances 4 (2014) 117138.
W. C. Lang and K. Forinash, Time-frequency analysis with the continuous wavelet transform, Am. J. Phys. 66 (1998) 794.
C. C. Chirilă, I. Dreissigacker, E. V. van der Zwan and M. Lein, Emission times in high-order harmonic
generation, Phys. Rev. A 81 (2010) 033412.
Y. Xiang, Y. Niu and S. Gong, Control of the high-order harmonics cutoff through the combination of a chirped laser and static electric field, Phys. Rev. A 79 (2009) 053419.
A. de Bohan, P. Antoine, D. B. Milošević and B. Piraux, Phase-dependent harmonic emission with ultrashort laser pulses, Phys. Rev. Lett. 81 (1998) 1837.
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