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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Terahertz generation by an amplitude-modulated Gaussian laser beam in a rippled density plasma column
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Terahertz generation by an amplitude-modulated Gaussian laser beam in a rippled density plasma column

机译：波纹密度等离子体柱中调幅高斯激光束产生的太赫兹

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摘要

The nonlinear interaction of amplitude-modulated two-dimensional and three-dimensional laser beams with a cylindrical plasma column and the generation of terahertz (THz) radiation are studied. The plasma column could be formed by a cylindrically symmetric laser pre-pulse impinging on a gas jet target. A two-dimensional Gaussian laser beam propagating through the plasma exerts a ponderomotive force on electrons, imparting on them a resonant transverse velocity at the modulation frequency, Ω, when Ω = ω_p/√2, where ω_p is the plasma frequency of the column. The current produces THz radiation. In the case of a cylindrically symmetric Gaussian laser beam, the electron response to ponderomotive force misses the resonance, yet the phase matching introduced by a density ripple could efficiently produce THz radiation. The power conversion efficiency of the order of the ratio of THz radiation frequency to laser frequency can be achieved at a laser intensity of ≈ 10~(15) W cm ~(-2) at 1 μm wavelength.
机译：研究了振幅调制的二维和三维激光束与圆柱形等离子柱的非线性相互作用以及太赫兹（THz）辐射的产生。等离子体柱可以由撞击在气体喷射靶上的圆柱形对称激光预脉冲形成。在等离子体中传播的二维高斯激光束会向电子施加磁势，当Ω=ω_p/√2时，电子在调制频率Ω上产生共振横向速度，其中ω_p是柱的等离子体频率。电流产生太赫兹辐射。在圆柱对称高斯激光束的情况下，电子对磁动力的响应会错过共振，但是由密度纹波引入的相位匹配可以有效地产生THz辐射。在波长为1μm的激光强度为≈10〜（15）W cm〜（-2）时，可以实现THz辐射频率与激光频率之比的功率转换效率。

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