Pump-power dependence of THz radiation from InAs surfaces under magnetic fields excited by ultrashort laser pulses
Pump-power dependence of THz radiation from InAs surfaces under magnetic fields excited by ultrashort laser pulses
复制标题
超短激光脉冲激发磁场下 InAs 表面太赫兹辐射的泵浦功率依赖性
DOI：
10.1063/1.1420784
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发表时间：
2001
影响因子：
4
通讯作者：
M. Hangyo
中科院分区：
文献类型：
--
作者：
M. Migita;M. Hangyo
研究了低泵浦功率密度(∼0.6mJ/cm2)和高泵浦功率密度(∼6mJ/cm2)下超短激光脉冲激励InAs表面的太赫兹辐射。太赫兹辐射幅度在这两种情况下都会受到影响。我们发现，在低密度激发情况下，施加磁场可以展宽辐射波形，而在高密度激发情况下则不是这样。这一结果是由瞬变光电流效应和光整流效应引起的磁场对THz辐射影响的不同所解释的。
THz radiation from InAs surfaces excited by ultrashort laser pulses has been studied under low (∼0.6 μJ/cm2 fluence) and high (∼6 mJ/cm2 fluence) pump power densities. The THz radiation amplitude is affected in both cases. We found that the radiation wave form is broadened by applying magnetic fields for the low-density-excitation case whereas it is not for the high-density-excitation case. This result is explained by the difference of the effect of the magnetic field on the THz radiation due to the transient photocurrent and optical rectification effects.