利用不对称极化门方案增强阿秒脉冲的强度
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摘要
理论提出了一种利用不对称极化门方案来增强阿秒脉冲强度的方法.结果表明,当两束圆偏振激光场采用不对称的强度时,不仅谐波干涉减小,而且谐波辐射强度明显增强,呈现了一个带宽在85 eV几乎由单一量子路径贡献产生的超长连续平台区.最后,通过叠加该平台区的谐波辐射光谱可以获得一个半高全宽在52 as的超短单个阿秒脉冲.
An effective method to enhance the intensities of the attosecond pulses has been proposed by using the asymmetric polarization gating(PG) technology. The results show that when the two circularly polarized pulses are asymmetry in pulse intensity, not only the modulation of the harmonics can be decreased; but also the intensities of the harmonics can be enhanced, correspnding to a 85 eV supercontinuum with the near-single quantum path contribution. Finally, by superposing the harmonics of this supercontinuum, a single attosecond pulse with the full width at half maximum of 52 can be obtained.
An effective method to enhance the intensities of the attosecond pulses has been proposed by using the asymmetric polarization gating(PG) technology. The results show that when the two circularly polarized pulses are asymmetry in pulse intensity, not only the modulation of the harmonics can be decreased; but also the intensities of the harmonics can be enhanced, correspnding to a 85 eV supercontinuum with the near-single quantum path contribution. Finally, by superposing the harmonics of this supercontinuum, a single attosecond pulse with the full width at half maximum of 52 can be obtained.
引文
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[2] 刘航,冯立强.交叉型纳米结构下气体位置对阿秒脉冲的影响 [J].原子与分子物理学报,2019,36:459.
[3] 冯立强,刘航.核运动对非奇次谐波产生的影响 [J].原子与分子物理学报,2018,35:1005.
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[8] Feng L Q.Molecular harmonic extension and enhancement from H2+ ions in the presence of spatially inhomogeneous fields [J].Phys Rev A,2015,92:053832.
[9] 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.
[10] Feng L Q,Chu T S.Nuclear signatures on the molecular harmonic emission and the attosecond pulse generation [J].J Chem Phys,2012,136:054102.
[11] Sansone G,Benedetti E,Calegari F,et al.Isolated single-cycle attosecond pulses [J].Science,2006,314:443.
[12] Zhao K,Zhang Q,Chini M,et al.Tailoring a 67 attosecond pulse through advantageous phase mismatch [J].Opt Lett,2012,37:3891.
[13] 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.
[14] 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.
[15] 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.
[16] 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.引用本文格式:中文:沈志博,刘航,李建,等.利用不对称极化门方案增强阿秒脉冲的强度 [J].四川大学学报:自然科学版,2019,56:476.英文:Shen Z B,Liu H,Li J,et al.Intensity enhancement in attosecond pulse by using asymmetric polarization gating technology [J].J Sichuan Univ:Nat Sci Ed,2019,56:476.
[2] 刘航,冯立强.交叉型纳米结构下气体位置对阿秒脉冲的影响 [J].原子与分子物理学报,2019,36:459.
[3] 冯立强,刘航.核运动对非奇次谐波产生的影响 [J].原子与分子物理学报,2018,35:1005.
[4] Corkum P B.Plasma perspective on strong field multiphoton ionization [J].Phys Rev Lett,1993,71:1994.
[5] Lewenstein M,Balcou P,Ivanov M Y,et al.Theory of high-harmonic generation by low-frequency laser fields [J].Phys Rev A,1994,49:2117.
[6] Mairesse Y,de Bohan A,Frasinski L J,et al.Attosecond synchronization of high-harmonic soft x-rays [J].Science,2003,302:1540.
[7] 葛鑫磊,王群.少周期非均匀场下原子空间位置对高次谐波发射的影响[J].原子与分子物理学报,2017,34:108.
[8] Feng L Q.Molecular harmonic extension and enhancement from H2+ ions in the presence of spatially inhomogeneous fields [J].Phys Rev A,2015,92:053832.
[9] 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.
[10] Feng L Q,Chu T S.Nuclear signatures on the molecular harmonic emission and the attosecond pulse generation [J].J Chem Phys,2012,136:054102.
[11] Sansone G,Benedetti E,Calegari F,et al.Isolated single-cycle attosecond pulses [J].Science,2006,314:443.
[12] Zhao K,Zhang Q,Chini M,et al.Tailoring a 67 attosecond pulse through advantageous phase mismatch [J].Opt Lett,2012,37:3891.
[13] 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.
[14] 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.
[15] 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.
[16] 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.引用本文格式:中文:沈志博,刘航,李建,等.利用不对称极化门方案增强阿秒脉冲的强度 [J].四川大学学报:自然科学版,2019,56:476.英文:Shen Z B,Liu H,Li J,et al.Intensity enhancement in attosecond pulse by using asymmetric polarization gating technology [J].J Sichuan Univ:Nat Sci Ed,2019,56:476.