Theoretical exploration of harmonic emission and attosecond pulse generation from H2+ in the present of spatial inhomogeneous field

Abstract

Abstract: High-order harmonic emission and attosecond pulse generation from H2+ molecule ion driven by the spatial inhomogeneous laser field have been theoretically investigated. The results show that by properly choosing the internuclear distance and the spatial inhomogeneous parameter of the fundamental pulse, not only the harmonic cutoff is remarkably enhanced, but also the harmonic modulation is reduced. Further, with the introduction of the controlling unipolar pulse, the harmonic cutoff has been further extended, resulting in a 530eV bandwidth with the single quantum path contribution. Finally, by properly superposing the selected harmonics, a series of attosecond X-ray pulses with the durations from 32as to 46as can be obtained.

CLC Number:

O562.4

References

[1] McPherson A, Gibson G, Jara H, Johann U, Luk T S, McIntyre I A, Boyer K, Rhodes C K. Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases [J]. J. Opt. Soc. Am. B 1987, 4: 595.
[2] L’Huillier A, Balcou P. High-order harmonic generation in rare gases with a 1-ps 1053-nm laser [J]. Phys. Rev. Lett. 1993, 70: 774.
[3] Yuan K J, Bandrauk A D. Single circularly polarized attosecond pulse generation by intense few cycle elliptically polarized laser pulses and terahertz fields from molecular media [J]. Phys. Rev. Lett., 2013, 110: 023003.
[4] Wang Y H, Yu C, Shi Q, Zhang Y D, Cao X, Jiang S C, Lu R F. Reexamination of wavelength scaling of harmonic yield in intense midinfrared fields [J]. Phys. Rev. A, 2014, 89: 023825.
[5] Lu R F, Yu C, Wang Y H, Shi Q, Zhang Y D. Control of electron localization to isolate and enhance molecular harmonic plateau in asymmetric HeH2+system [J]. Phys. Lett. A, 2014, 378: 90.
[6] Goulielmakis E, Schultze M, Hofstetter M, et al. Single-cycle nonlinear optics [J]. Science, 2008, 320: 1614.
[7] Corkum P B. Plasma perspective on strong field multiphoton ionization [J]. Phys. Rev. Lett., 1993, 71: 1994.
[8] Chang Z. Chirp of the single attosecond pulse generated by a polarization gating [J]. Phys. Rev. A, 2005, 71: 023813.
[9] Feng L Q, Liu H, Liu X J. Polarized gating assisted generation of the ultrashort extreme-ultraviolet sources [J] J. Math. Chem. 2014, 52: 2074.
[10] Lu R F, He H X, Guo Y H, Han K L. Theoretical study of single attosecond pulse generation with a three-colour laser field [J]. J. Phys. B: At. Mol. Opt. Phys., 2009, 42: 225601.
[11] Zeng Z, Cheng Y, Song X, Li R, Xu Z. Generation of an extreme ultraviolet supercontinuum in a two-color laser field [J]. Phys. Rev. Lett., 2007, 98: 203901.
[12] Feng L Q, Chu T S. High-order harmonics extension and isolated attosecond pulse generation in three-color field: Controlling factors [J]. Phys. Lett. A, 2011, 375: 3641.
[13] Feng L Q, Chu T S. Quantum path control on the harmonic emission in the presence of a terahertz field [J]. Chem. Phys. 2012, 405: 26.
[14] Feng L Q, Chu T S. Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects [J]. Phys. Rev. A, 2011, 84: 053853.
[15] Li P C, Zhou X X, Wang G L, Zhao Z X. Isolated sub-30-as pulse generation of an He+ ion by an intense few-cycle chirped laser and its high-order harmonic pulses [J]. Phys. Rev. A, 2009, 80: 053825.
[16] Popmintchev T, Chen M C, Cohen O, Grisham M, Rocca J, Murnane M, Kapteyn H. Extended phase matching of high harmonics driven by mid-infrared light [J]. Opt. Lett. 2008, 33: 2128.
[17] Li P C, Laughlin C, Chu S I. Generation of isolated sub-20-attosecond pulses from He atoms by two-color midinfrared laser fields [J]. Phys. Rev. A 2014, 89: 023431.
[18] Kim S, Jin J, Kim Y J, Park I Y, Kim Y, Kim S W. High-harmonic generation by resonant plasmon field enhancement [J]. Nature 2008, 453: 757.
[19] Shaaran T, Ciappina M F, Lewenstein M. Quantum-orbit analysis of above-threshold ionization driven by an intense spatially inhomogeneous field [J]. Phys. Rev. A 2013, 87: 053415.
[20] Shaaran T, Ciappina M F, Lewenstein M. Quantum-orbit analysis of high-order-harmonic generation by resonant plasmon field enhancement [J]. Phys. Rev. A 2012, 86: 023408.
[21] Ciappina M F, Acimovic S S, Shaaran T, Biegert J, Quidant R, Lewenstein M. Enhancement of high harmonic generation by confining electron motion in plasmonic nanostrutures [J]. Opt. Express 2012, 20: 26261.
[22] Ciappina M F, Pérez-Hernández, J A, Shaaran T, Roso L, Lewenstein M. Electron-momentum distributions and photoelectron spectra of atoms driven by an intense spatially inhomogeneous field [J]. Phys. Rev. A 2013, 87: 063833.
[23] Cao X, Jiang S C, Yu C, Wang Y H, Bai L H, Lu R F. Generation of isolated sub-10-attosecond pulses in spatially inhomogenous two-color fields [J]. Opt. Express 2014, 22: 26153.
[24] He L X, Wang Z, Li Y, Zhang Q B, Lan P F, Lu P X. Wavelength dependence of high-order-harmonic yield in inhomogeneous fields [J]. Phys. Rev. A, 2013, 88: 053404.
[25] Luo J H, Li Y, Wang Z, He L X, Zhang Q B, Lan P F, Lu P X. Efficient supercontinuum generation by UV-assisted midinfrared plasmonic fields [J]. Phys. Rev. A, 2014, 89: 023405.
[26] Wang Z, Lan P F, Luo J H, He L X, Zhang Q B, Lu P X. Control of electron dynamics with a multicycle two-color spatially inhomogeneous field for efficient single-attosecond-pulse generation [J]. Phys. Rev. A, 2013, 88: 063838.
[27] Wang Z, He L X, Luo J H, Lan P F, Lu P X. High-order harmonic generation from Rydberg atoms in inhomogeneous fields [J]. Opt. Express, 2014, 22: 25909.
[28] Feng L Q, Liu H. Generation of the ultrabroad bandwidth with keV by three-color low intense mid-infrared inhomogeneous pulse [J]. Optics & Laser Technology 2016, 81, 7.
[29] Feng L Q, Liu H. Attosecond extreme ultraviolet generation in cluster by using spatially
inhomogeneous field [J]. Phys. Plasmas 2015, 22: 013107.
[30] Bian X B, Bandrauk A D. Multichannel molecular high-order harmonic generation from asymmetric diatomic molecules [J]. Phys. Rev. Lett. 2010, 105: 093903.
[31] Kamta G L, Bandrauk A D. Phase dependence of enhanced ionization in asymmetric molecules [J]. Phys. Rev. Lett. 2005, 94: 203003.
[32] Lu R F, Zhang P Y, Han K L. Attosecond-resolution quantum dynamics calculations for atoms and molecules in strong laser fields [J]. Phys. Rev. E, 2008, 77: 066701.
[33] Hu J, Han K L, He G Z. Correlation quantum dynamics between an electron and D2+ molecule with attosecond resolution [J]. Phys. Rev. Lett. 2005, 95: 123001.
[34] Miao X Y, Du H N. Theoretical study of high-order-harmonic generation from asymmetric diatomic molecules [J]. Phys. Rev. A, 2013, 87: 053404.
[35] Burnett K, Reed V C, Cooper J, Knight P L. Calculation of the background emitted during high-harmonic generation [J]. Phys. Rev. A, 1992, 45: 3347.
[36] Antoine P, Piraux B, Maquet A. Time profile of harmonics generated by a single atom in a strong electromagnetic field [J]. Phys. Rev. A, 1995, 51:R1750.
[37] Mairesse Y, Bohan A D, Frasinski L J, et al. Attosecond synchronization of high-harmonic soft x-rays [J]. Science, 2003, 302: 1540.