Directional enhancement of selected high-order-harmonics from intense laser irradiated blazed grating targets

Zhang, Guobo and Chen, Min and Liu, Feng and Yuan, Xiaohui and Weng, Suming and Zheng, Jun and Ma, Yanyun and Shao, Fuqiu and Sheng, Zhengming and Zhang, Jie (2017) Directional enhancement of selected high-order-harmonics from intense laser irradiated blazed grating targets. Optics Express, 25 (20). pp. 23567-23578. ISSN 1094-4087

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    Abstract

    Relativistically intense laser solid target interaction has been proved to be a promising way to generate high-order harmonics, which can be used to diagnose ultrafast phenomena. However, their emission direction and spectra still lack tunability. Based upon two-dimensional particle-in-cell simulations, we show that directional enhancement of selected high-order-harmonics can be realized using blazed grating targets. Such targets can select harmonics with frequencies being integer times of the grating frequency. Meanwhile, the radiation intensity and emission area of the harmonics are increased. The emission direction is controlled by tailoring the local blazed structure. Theoretical and electron dynamics analysis for harmonics generation, selection and directional enhancement from the interaction between multi-cycle laser and grating target are carried out. These studies will benefit the generation and application of laser plasma-based high order harmonics.