论文标题
从两个颜色激光脉冲相互作用与空气中的薄电介质固体目标增强了宽带Terahertz辐射
Enhanced broadband Terahertz radiation from two colour laser pulse interaction with thin dielectric solid target in air
论文作者
论文摘要
我们报告了增强的宽带Terahertz（THZ）的生成，并从飞秒两种颜色激光脉冲与透明透明的介电胶带目标的相互作用中进行了详细的表征。提出的源易于实现，具有激光能量的出色可扩展性。使用傅立叶变换光谱仪的光谱表征显示，相对于环境空气中常规的两彩激光等离子体，在THZ区域，THZ区域的产量增强了150％以上。此外，源光谱延伸至40 THz，磁通量的增强> 30％。通过二维粒子中的模拟良好支持的实验结果表明，磁带表面上形成的不对称激光脉冲相互作用以及在磁带表面形成的近固体密度等离子体产生的瞬态光电流程负责增强的Terahertz生成。该来源将对基于实验室的Terahertz来源的多学科活动和持续的应用有用。
We report enhanced broadband Terahertz (THz) generation and detailed characterization from the interaction of femtosecond two colour laser pulses with thin transparent dielectric tape target in ambient air. The proposed source is easy to implement, exhibits excellent scalability with laser energy. Spectral characterization using Fourier transform spectrometer reveals yield enhancement of more than 150 % in the THz region of 0.1 - 10 THz with respect to conventional two-colour laser plasma source in ambient air. Further, the source spectrum extends up to 40 THz with an enhancement of flux > 30 %. Experimental results, well supported with two-dimensional particle-in-cell simulations establishes that the transient photo-current produced by the asymmetric laser pulse interaction with air plasma as well as near solid density plasma formed on the tape surface is responsible for the enhanced terahertz generation. The source will be useful for the multidisciplinary activities and ongoing applications of the laboratory-based terahertz sources.
