交叉型纳米结构下气体位置对阿秒脉冲的影响
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摘要
理论提出并研究了一种在交叉型纳米结构下运用非均匀极化门方案获得孤立阿秒脉冲的方法.结果表明,当气体沿纳米结构负方向注入时,用于产生阿秒脉冲的高阶谐波只发生在纳米结构的一侧.因此,在此方案下,不仅谐波截止能量得到延伸,而且谐波干涉结构得到减小.随后,通过叠加平台区的谐波,可获得一个持续时间在33 as的孤立阿秒脉冲.
An effect method to obtain the single attosecond pulses(SAPs) by using the inhomogeneous polarization gating(PG) technology in the crossed nanostructure has been proposed and investigated. It is found that by properly injecting the gas into the negative position of the nanostructure, the emitted harmonics at the very highest orders used for the SAPs only occur at one side of the region inside the nanostructure. As a result, not only the extension of the harmonic cutoff can be achieved, but also the modulations of the harmonics can be decreased. Further, by superposing the selected harmonics from the inhomogeneous PG scheme, a 33 as SAP can be obtained.
An effect method to obtain the single attosecond pulses(SAPs) by using the inhomogeneous polarization gating(PG) technology in the crossed nanostructure has been proposed and investigated. It is found that by properly injecting the gas into the negative position of the nanostructure, the emitted harmonics at the very highest orders used for the SAPs only occur at one side of the region inside the nanostructure. As a result, not only the extension of the harmonic cutoff can be achieved, but also the modulations of the harmonics can be decreased. Further, by superposing the selected harmonics from the inhomogeneous PG scheme, a 33 as SAP can be obtained.
引文
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[3] Li N N,Ge X L,Liu X S.High-order harmonic generation and isolated attosecond pulse generation in a circularly polarized laser pulses with Terahertz field [J].J.At.Mol.Phys.,2016,33:105 (in Chinese) [李娜娜,葛鑫磊,刘学深.圆偏振激光附加太赫兹场作用下的高次谐波发射和孤立阿秒脉冲的产生 [J] 原子与分子物理学报,2016,33:105]
[4] He W N,Wang G L,Zhou X X.An isolated attosecond pulse emission of He atom driven by the midinfrared laser field with polarization gating [J].J.At.Mol.Phys.,2015,32:437 (in Chinese) [何文娜,王国利,周效信.极化门控制下中红外激光场驱动He原子产生的单个阿秒脉冲 [J] 原子与分子物理学报,2015,32:437]
[5] Corkum P B.Plasma perspective on strong field multiphoton ionization [J].Phys.Rev.Lett.,1993,71:1994.
[6] Mairesse Y,Bohan A D,Frasinski L J,et al.Attosecond synchronization of high-harmonic soft x-rays [J].Science,2003,302:1540.
[7] Goulielmakis E,Schultze M,Hofstetter M,et al.Single-cycle nonlinear optics [J].Science,2008,320:1614.
[8] 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.
[9] 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.
[10] Sansone G,Benedetti E,Calegari F,et al.Isolated single-cycle attosecond pulses [J].Science,2006,314:443.
[11] Zhao K,Zhang Q,Chini M,et al.Tailoring a 67 attosecond pulse through advantageous phase mismatch [J].Opt.Lett.,2012,37:3891.
[12] Kim S,Jin J,Kim Y J,et al.High-harmonic generation by resonant plasmon field enhancement[J].Nature,2008,453:757.
[13] I Yavuz.Gas population effects in harmonic emission by plasmonic fields [J].Phys.Rev.A,2013,87:053815.
[14] Cao X,Jiang S C,Yu C,et al.Generation of isolated sub-10-attosecond pulses in spatially inhomogeneous two-color fields[J].Opt.Express,2014,22:26153.
[15] Feng L Q,Liu H.Generation of single attosecond pulse by using polarization gating scheme in bowtie-shaped nanostructure [J].J.At.Mol.Phys.,2019,36:82 (in Chinese)[冯立强,刘航.利用蝴蝶型纳米结构下的极化门方案输出单个阿秒脉冲 [J] 原子与分子物理学报,2019,36:82]
[16] 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.
[17] 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.
[18] Feng L Q.Molecular harmonic extension and enhancement from H2+ ions in the presence of spatially nonhomogeneous fields [J].Phys.Rev.A,2015,92:053832.
[19] 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.