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利用三维经典系综模型, 研究了整个系综两电子(Ar原子为例)从激光场吸收的能量对激光参数(波长、激光强度和椭偏率)的依赖关系. 结果显示, 当激光强度固定, 波长增加时, 整个系综两电子从激光场吸收的能量整体呈上升趋势, 但不同强度下趋势略有差异. 在较低强度时整个系综两电子从激光场吸收的能量对波长的依赖关系呈现持续平稳增加的趋势, 在较高强度时呈现先缓慢减小再快速增大的趋势. 对强度的依赖关系在不同波长时呈现两个有趣的交叉点. 对椭偏率的依赖关系在较低强度时呈现先逐渐减小再缓慢增大的趋势; 在中等强度时呈现一个“阶梯型”即先缓慢增大再逐渐减小最后缓慢增大; 在更高强度时呈现先逐渐增大再逐渐减小的趋势. 为了解释整个系综两电子从激光场吸收的能量对激光参数的依赖关系,把整个系综的动力学过程分为双电离、单电离、受挫单电离和受挫双电离4种通道. 然后分析各个通道的特征及其如何主导整个系综两电子从激光场吸收的能量的变化趋势. 分析结果表明, 整个系综两电子从激光场吸收的能量对波长、激光强度和椭偏率的依赖均是由于某种通道主导整个系综两电子从激光场吸收的能量的结果.Using the three-dimensional classical ensemble model, we investigate the dependence of the energy absorbed by two electrons (Ar atom as an example) from the laser field on the laser parameters (wavelength, laser intensity and ellipticity). The results show that when the laser intensity is fixed and the wavelength increases, the energy absorbed by the two electrons from the laser field increases as a whole, but the trend is slightly different under different intensities. At lower intensity the dependence of the energy absorbed by the two electrons from the laser field on wavelength increases steadily and at higher intensity it decreases slowly and then increases rapidly. The intensity dependence of the energy absorbed by two electrons from the laser field in the whole ensemble presents two interesting intersections at different wavelengths. The dependence of the energy absorbed by the two electrons from the laser field on the ellipticity first decreases and then increases slowly at lower intensity; it has a “Ladder shape” that slowly increases and then decreases and finally slowly increases at moderate intensity; it shows a trend of increasing first and then decreasing at higher intensities. In order to explain the dependence of the energy absorbed by two electrons from the laser field on the laser parameters (wavelength, laser intensity and ellipticity), the kinetic process of the whole ensemble is divided into four channels: double ionization, single ionization, frustrated single ionization and frustrated double ionization. The characteristics of each channel and how it dominates the overall trend of energy absorption from the laser field by the two electrons are then analyzed. The analysis results show that the dependence of the energy absorbed by the two electrons from the laser field on wavelength、laser intensity and ellipticity is due to the fact that some channels dominate the energy absorbed by the two electrons from the laser field.
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Keywords:
- ultrafast dynamics of atom /
- single ionization /
- double ionization /
- frustrated single ionization /
- frustrated double ionization
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图 1 整个系综两电子从激光场吸收的能量
$ \Delta {E_{\text{t}}} $ 随波长的变化曲线, 对应的激光强度分别为0.1 PW/cm2 (深蓝色实心圆点) 和 0.5 PW/cm2 (绿色实心方块).Fig. 1. Energy absorbed by two electrons from the laser field in the whole ensemble
$ \Delta {E_{\text{t}}} $ as a function of wavelength, the corresponding laser intensities are 0.1 PW/cm2 (dark blue solid dot) and 0.5 PW/cm2 (green solid square) respectively.
图 2 双电子系统与激光相互作用时4种典型的物理过程: DI, SI, FDI和FSI. 左列: 两个电子的能量随时间的演化, 右列: 两个电子到原子核的距离随时间的演化.
Fig. 2. There are four typical physical processes in the interaction between a two-electron system and a laser: DI, SI, FDI and FSI. Left column: the energy of the two electrons as a function of time; right column: the distance between the two electrons and the nucleus as a function of time.
图 3 4种通道的波长依赖 (a) (b) 4种通道下两电子从激光场吸收的能量
$ \Delta {E_{\text{c}}} $ 随波长的变化曲线; (c) (d) 4种通道的产率随波长的变化曲线; (e) (f) 4种通道在整个系综中两电子从激光场吸收的能量$ \Delta E_{\text{t}}^{\text{c}} $ 随波长的变化曲线以及整个系综两电子从激光场吸收的能量$ \Delta {E_{\text{t}}} $ 随波长的变化曲线. 左列和右列对应的激光强度分别为0.1和0.5 PW/cm2.Fig. 3. Wavelength dependence of the four channels: (a) (b)
$ \Delta {E_{\text{c}}} $ as a function of wavelength in four channels; (c) (d) probabilities of the four channels as a function of wavelength; (e) (f)$ \Delta E_{\text{t}}^{\text{c}} $ and$ \Delta {E_{\text{t}}} $ as a function of wavelength. The laser intensities corresponding to the left and right columns are 0.1 and 0.5 PW/cm2.
图 4 整个系综两电子从激光场吸收的能量
$ \Delta {E_{\text{t}}} $ 随强度的变化曲线, 对应的波长分别为400 nm (红色实心菱形线) 和1600 nm (绿色实心三角形线).Fig. 4. Energy absorbed by two electrons from the laser field in the whole ensemble
$ \Delta {E_{\text{t}}} $ as a function of intensity, the corresponding wavelengths are 400 nm (red solid diamond line) and 1600 nm (green solid triangle line) respectively.
图 5 (a)−(d)不同波长下4种通道两电子从激光场吸收的能量
$ \Delta {E_{\text{c}}} $ 随强度的变化曲线; (e)−(h)不同波长下4种通道的产率随强度的变化曲线; (i)−(l)不同波长下4种通道在整个系综中两电子从激光场吸收的能量$ \Delta E_{\text{t}}^{\text{c}} $ 随强度的变化曲线. 从左到右依次为DI, SI, FDI和FSI通道. 红色空心菱形(三角形)代表DI通道, 紫色空心菱形(三角形)代表SI通道, 浅蓝色空心菱形(三角形)代表FDI通道, 橙色空心菱形(三角形)代表FSI通道. 对应的波长分别为400 nm (菱形)和1600 nm (三角形).Fig. 5. (a)−(d)
$ \Delta {E_{\text{c}}} $ in four channels at different wavelengths as a function of intensity; (e)−(h) probabilities of the four channels as a function of intensity at different wavelengths; (i)−(l)$ \Delta E_{\text{t}}^{\text{c}} $ in four channels as a function of intensity at different wavelengths. From left to right are DI, SI, FDI and FSI channels. The red hollow diamond (triangle) represents DI channel, the purple hollow diamond (triangle) represents SI channel, the light blue hollow diamond (triangle) represents FDI channel, and the orange hollow diamond (triangle) represents FSI channel. The corresponding wavelengths are 400 nm (diamond) and 1600 nm (triangle), respectively.
图 6 整个系综两电子从激光场吸收的能量
$ \Delta {E_{\text{t}}} $ 随椭偏率的变化, 对应的激光强度分别为0.5 PW/cm2 (红色实心圆形线)、3 PW/cm2 (深蓝色实心方形线) 和5 PW/cm2 (绿色实心五角星形线), 波长为800 nm.Fig. 6. Energy absorbed by two electrons from the laser field in the whole ensemble
$ \Delta {E_{\text{t}}} $ as a function of ellipticity, The corresponding laser intensities are 0.5 PW/cm2 (red solid circular line), 3 PW/cm2 (dark blue solid square line) and 5 PW/cm2 (green solid pentagram line), the wavelength is 800 nm.
图 7 4种通道的椭偏率依赖 (a)−(c) 4种通道下两电子从激光场吸收的能量
$ \Delta {E_{\text{c}}} $ 随椭偏率的变化; (d)−(f) 4种通道的产率随椭偏率的变化; (g)−(i) 4种通道在整个系综中两电子从激光场吸收的能量$ \Delta E_{\text{t}}^{\text{c}} $ 随椭偏率的变化以及整个系综两电子从激光场吸收的能量$ \Delta {E_{\text{t}}} $ 随椭偏率的变化. 左列、中间列、右列对应的激光强度分别为0.5, 3 和5 PW/cm2.Fig. 7. Ellipticity dependence of the four channels: (a)−(c)
$ \Delta {E_{\text{c}}} $ as a function of ellipticity in four channels; (d)−(f) probabilities of the four channels as a function of ellipticity; (g)−(i)$ \Delta E_{\text{t}}^{\text{c}} $ and$ \Delta {E_{\text{t}}} $ as a function of ellipticity. The laser intensities of the left, middle and right columns are 0.5, 3 and 5 PW/cm2. -
[1] Paulus G G, Nicklich W, Xu H, Lambropoulos P, Walther H 1994 Phys. Rev. Lett. 72 2851
Google Scholar
[2] Becker W, Grasbon F, Kopold R, Miloševic D B, Paulus G G, Walther H 2002 Adv. At. Mol. Opt. Phys. 48 35
[3] McPherson A, Gibson G, Jara H, Johann U, Luk T S, McIntyre I A, Boyer K, Rhodes C K 1987 J. Opt. Soc. Am. B 4 595
Google Scholar
[4] Seres J, Seres E, Verhoef A J, Tempea G, Streli C, Wobrauschek P, Yakovlev V, Scrinzi A, Spielmann C, Krausz F 2005 Nature 433 596
Google Scholar
[5] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
Google Scholar
[6] Zhai C Y, Zhu X S, Long J, Shao R Z, Zhang Y F, He L X, Tang Q B, Li Y B, Lan P F, Yu B H, Lu P X 2021 Phys. Rev. A 103 033104
Google Scholar
[7] Sun F H, Chen X, Zhang W B, Qiang J J, Li H, Lu P F, Gong X C, Ji Q Y, Lin K, Li H X, Tong J H, Chen F, Ruiz C, Wu J, He F 2020 Phys. Rev. A 101 021402
Google Scholar
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Google Scholar
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Google Scholar
[10] Zhou Y M, Liao Q, Lu P X 2009 Phys. Rev. A 80 023412
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[14] 余本海, 李盈傧, 汤清彬 2012 61 203201
Google Scholar
Yu B H, Li Y B, Tang Q B 2012 Acta Phys. Sin. 61 203201
Google Scholar
[15] Li Y B, Wang X, Yu B H, Tang Q B, Wang G H, Wan J G 2016 Sci. Rep. 6 37413
Google Scholar
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Google Scholar
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Google Scholar
[18] Liao Q, Li Y, Qin M Y, Lu P X 2017 Phys. Rev. A 96 063408
Google Scholar
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Google Scholar
[20] Corkum P B 1993 Phys. Rev. Lett. 71 1994
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[26] Fleischer A, Wörner H J, Arissian L, Liu L R, Meckel M, Rippert A, Dörner R, Villeneuve D M, Corkum P B, Staudte A 2011 Phys. Rev. Lett. 107 113003
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[30] Ulrich B, Vredenborg A, Malakzadeh A, Meckel M, Cole K, Smolarski M, Chang Z, Jahnke T, Dörner R 2010 Phys. Rev. A 82 013412
Google Scholar
[31] Shomsky K N, Smith Z S, Hann S L 2009 Phys. Rev. A 79 061402
Google Scholar
[32] Sayler A M, McKenna J, Gaire B, Kling N G, Carnes K D, Ben-Itzhak I 2012 Phys. Rev. A 86 033425
Google Scholar
[33] Chen A, Price H, Staudte A, Emmanouilidou A 2016 Phys. Rev. A 94 043408
Google Scholar
[34] Larimian S, Erattupuzha S, Baltuška A, Kitzler-Zeiler M, Xie X 2020 Phys. Rev. Res. 2 013021
Google Scholar
[35] Li Y B, Xu J K, Yu B H, Wang X 2020 Opt. Express 28 7341
Google Scholar
[36] Parker J S, Doherty B J S, Taylor K T, Schultz K D, Blaga C I, DiMauro L F 2006 Phys. Rev. Lett. 96 133001
Google Scholar
[37] Liu A H, Thumm Uwe 2014 Phys. Rev. A 89 063423
Google Scholar
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Google Scholar
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Google Scholar
[40] Panli R, Eberly J H, Haan S L 2001 Opt. Express 8 431
Google Scholar
[41] Haan S L, Breen L, Karim A, Eberly J H 2006 Phys. Rev. Lett. 97 103008
Google Scholar
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Google Scholar
[43] Wang X, Eberly J H 2010 Phys. Rev. Lett. 105 083001
Google Scholar
[44] Li Y B, Mei L L, Chen H M, Xu J K, Tang Q B, Zhao Y G, Han Q Q, Wang C L, Tong A H, Ge G X, Yu B H 2018 Int. J. Mod. Phys. B 32 1850302
Google Scholar
[45] Li Y B, Xu J K, Chen H M, Li Y H, He J J, Qin L L, Shi L K, Zhao Y G, Tang Q B, Zhai C Y, Yu B H 2021 Opt. Commun. 493 127019
Google Scholar
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