Increased energy of THz waves from a cluster plasma by optimizing laser pulse duration
Increased energy of THz waves from a cluster plasma by optimizing laser pulse duration
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DOI：
10.1063/1.5075712
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发表时间：
2019-01
期刊：
影响因子：
1.6
通讯作者：
K. Mori;M. Hashida;T. Nagashima;Dazhi Li;K. Teramoto;Y. Nakamiya;S. Inoue;S. Sakabe
中科院分区：
文献类型：
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作者：
K. Mori;M. Hashida;T. Nagashima;Dazhi Li;K. Teramoto;Y. Nakamiya;S. Inoue;S. Sakabe
我们研究了由不同宽度的激光脉冲产生的氩团簇等离子体产生太赫兹（THz）波。太赫兹能量依赖于激光脉冲持续时间，并在脉冲持续时间为250 fs时达到峰值。太赫兹能量对激光脉冲宽度的这种依赖性归因于脉冲上升沿产生的等离子体密度。通过用共线双脉冲激光辐照团簇，我们证明了通过控制等离子体密度可以提高太赫兹能量。优化共线双激光脉冲的延迟时间使THz能量增加了1.25倍，是同时照射共线双激光脉冲的情况下的2.5倍。
We have investigated the generation of terahertz (THz) waves from an argon cluster plasma produced by laser pulses of various durations. THz energy depends on laser pulse duration and reaches a peak at a pulse duration of ∼250 fs. This dependence of THz energy on laser pulse duration is attributed to the plasma density produced by the rising edge of the pulse. By irradiating clusters with collinear double laser pulses, we demonstrate that the THz energy can be increased by controlling the plasma density. Optimizing the delay time of the collinear double laser pulses increases the THz energy by ∼2.5 times that with simultaneous irradiation of collinear double laser pulses.