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THz时域光谱诊断激光等离子体密度和碰撞频率

Keywords: THz波时域光谱,等离子体,电子密度,碰撞频率

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Abstract:

从电子在THz波电场中的运动方程出发,讨论了THz波在等离子体中的传播规律.从而可以得到由等离子体电子密度和碰撞频率决定的THz波的复折射率.该复折射率决定了THz波在等离子体中的传播,即THz脉冲相位和振幅变化.THz时域光谱系统可以测量THz波传播的相位和振幅,因此可以利用THz时域光谱来诊断等离子体密度和碰撞频率.由于受到等离子体色散关系的限制,该方法测量的等离子体密度有一定范围.在等离子体电子密度位于1012~1016/cm3之间内,该方法可以得到较好的应用.

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