激光技术, 2019, 43 (1): 53, 网络出版: 2019-01-22  

利用非均匀抽运探测激光增强阿秒脉冲强度

Enhancement of attosecond pulse intensity based on inhomogeneous pump-probe laser field
作者单位
1 辽宁工业大学 化学与环境工程学院, 锦州 121001
2 辽宁工业大学 理学院, 锦州 121001
摘要
为了增强高次谐波光谱及阿秒脉冲的强度, 采用数值求解薛定谔方程的方法, 理论研究了H+2在抽运探测激光驱动下高次谐波辐射特点。结果表明, 在抽运激光驱动下, H+2首先被激发到多光子共振电离区间, 进而增大电离几率; 随后在探测激光驱动下, 谐波辐射强度得到增强; 当采用不对称非均匀激光场时, 谐波截止频率可以进一步延伸, 并且谐波平台区只由单一谐波辐射能量峰贡献; 最后通过叠加傅里叶变换后的谐波可获得脉宽在32as的脉冲。该研究对单个阿秒脉冲的产生是有帮助的。
Abstract
In order to enhance intensity of high-order harmonic spectrum and attosecond pulse, characteristics of high-order harmonic radiation of H+2 driven by pump probe laser were studied by numerical solution of Schrodinger equation. The results show that H+2 is excited into the multi-photon resonance ionization region at first and then increases the ionization probability under the pump laser. The harmonic radiation intensity is enhanced under the detection laser. The cut-off frequency of the harmonic wave can be further extended when the asymmetric non-uniform laser field is used. The energy peak contribution of single harmonic radiation is obtained. Finally, the pulse width of 32as can be obtained by superposing the harmonics of Fourier transform. This study is helpful for the generation of single attosecond pulses.
参考文献

[1] SANSONE G, BENEDETTI E, CALEGARI F, et al. Isolated single-cycle attosecond pulses [J]. Science, 2006, 314(5798): 443-446.

[2] LIU H, LI Y, YAO Z, et al. Study on harmonic cutoff energy and intensity under the control of chirped laser [J]. Laser Technology, 2017, 41(5): 708-711 (in Chinese).

[3] GOULIELMAKIS E, SCHULTZE M, HOFSTETTER M, et al. Single-cycle nonlinear optics [J]. Science, 2008, 320(5883): 1614-1617.

[4] CORKUM P B. Plasma perspective on strong field multiphoton ionization [J]. Physical Review Letters, 1993, 71(13): 1994-1997.

[5] LEWENSTEIN M, BALCOU P, IVANOV M Y, et al. Theory of high-harmonic generation by low-frequency laser fields [J]. Physical Review, 1994, A49(3): 2117-2132.

[6] STEELKOV V V, STERJANTOV A F, SHUBIN N Y, et al. XUV generation with several-cycle laser pulse in barrier-suppression regime [J].Journal of Physics, 2006, B39(3): 577-590.

[7] LIU H, FENG L Q. Mid-infrared field phase measurement and attosecond pulse generation [J]. Laser Technology, 2017, 41(2): 151-158 (in Chinese).

[8] LIU H, FENG L Q. Harmonic emission spectra and attosecond pulse generation from helium atomdriven by the mid-infrared nonhomogeneous field [J]. Spectroscopy Letters, 2017, 50(5): 289-297.

[9] LIU Sh Sh, MIAO X Y. Enhancement of high-order harmonic emi-ssion by using a coherent superposition in a two-color laser field [J]. Journal of Atomic and Molecular Physics, 2012, 29(5): 881-885 (in Chinese).

[10] FENG L Q, CHU T S. Generation of an isolated sub-40-as pulse us-ing two-color laser pulses: Combined chirp effects [J]. Physical Review, 2011, A84(5): 053853.

[11] YUAN K J, BANDRAUK A D. Single circularly polarized attose-cond pulse generation by intense few cycle elliptically polarized laser pulses and terahertz fields from molecular media [J]. Physical Review Letters, 2013, 110(2): 023003.

[12] KIM S, JIN J, KIM Y J, et al. High-harmonic generation by resonant plasmon field enhancement [J]. Nature, 2008, 453(7196): 757-760.

[13] YAVUZ I, BLEDA E A, ALTUN Z, et al. Generation of a broadband xuv continuum in high-order-harmonic generation by spatially inhomogeneous fields [J]. Physical Review, 2012, A85(1): 013416.

[14] CAO X, JIANG S, YU C, et al. Generation of isolated sub-10-attosecond pulses in spatially inhomogenous two-color fields [J]. Optics Express, 2014, 22(21): 26153-26161.

[15] SIVIS M, DUWE M, ABEL B, et al. Extreme-ultraviolet light ge-neration in plasmonic nanostructures [J]. Nature Physics, 2013, 9(5): 304-309.

[16] FENG L Q. Molecular harmonic extension and enhancement from H+2 ions in the presence of spatially inhomogeneous fields [J]. Physical Review, 2015, A92(5): 053832.

[17] LU R F, ZHANG P Y, HAN K L. Attosecond-resolution quantum dynamics calculations for atoms and molecules in strong laser fields [J]. Physical Review, 2008, E77(6): 066701.

[18] HU J, HAN K L, HE G Z. Correlation quantum dynamics between an electron and D+2 molecule with attosecond resolution [J]. Physical Review Letters, 2005, 95(12): 123001.

[19] FENG L Q, LIU H, LIU H. Spatial distribution of H+2 radiation harmonics in spatial homogeneous and inhomogeneous fields [J]. Laser Technology, 2017, 41(4): 467-472 (in Chinese).

[20] ANTOINE P, PIRAUX B, MAQUET A. Time profile of harmonics generated by a single atom in a strong electromagnetic field [J]. Physical Review, 1995, A51(3): R1750-R1753.

[21] LIU H, LI W L, FENG L Q. Chirp control of multi-photon resonance ionization and charge resonance enhanced ionization on mole-cular harmonic generation [J]. Chemical Physics Letters, 2017, 676: 118-123.

[22] LIU H, FENG L Q, LI W L, et al. Spatial position scaling on harmonic generation from He atom in bowtie shaped nanostructure [J]. Optics Communications, 2017, 398: 31-38.

刘航, 冯立强. 利用非均匀抽运探测激光增强阿秒脉冲强度[J]. 激光技术, 2019, 43(1): 53. LIU Hang, FENG Liqiang. Enhancement of attosecond pulse intensity based on inhomogeneous pump-probe laser field[J]. Laser Technology, 2019, 43(1): 53.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!