Comparative studies of resonance enhancement of harmonic radiation in indium plasma using multicycle and few-cycle pulses
Comparative studies of resonance enhancement of harmonic radiation in indium plasma using multicycle and few-cycle pulses
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DOI：
10.1103/physreva.88.033838
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发表时间：
2013-09-23
影响因子：
2.9
通讯作者：
Marangos, J. P.
中科院分区：
文献类型：
--
作者：
Ganeev, R. A.;Witting, T.;Marangos, J. P.
分析了在多周期(30fs)和少周期(3.5fs)脉冲激励条件下，铟激光烧蚀等离子体中增强的单次谐波产生。我们证明了脉冲宽度对铟等离子体发射光谱的强烈影响。对于几个周期的脉冲，增强的发射与预期的谐波波长不一致，而多周期脉冲的情况是这样的。我们利用偏振和双缝干涉技术测试了20 eV附近增强发射的相干特性。我们还通过调节激光脉冲宽度来表征铟等离子体发射的动力学。给出了几个周期脉冲激励下铟等离子体发射的理论分析。
Enhanced single harmonic generation is analyzed in indium laser ablation plasmas at excitation conditions of multicycle (30 fs) and few-cycle (3.5 fs) pulses. We demonstrate the strong influence of pulse duration, on the emission spectra from the indium plasma. For few-cycle pulses, the enhanced emissions do not coincide with the expected harmonic wavelengths, which is the case for multicycle pulses. We test the coherent properties of an enhanced emission around 20 eV using polarization and double-slit interference techniques. We also characterize the dynamics of the emissions from the indium plasma by tuning the laser pulse duration. A theoretical analysis is presented to describe the indium plasma emission upon excitation by few-cycle pulses.