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Experimental study on Kα X-ray emission from intense femtosecond laser-solid interactions

Chen Li-Ming Kazuhisa Nakajima Toshi Tajima Xu Miao-Hua Li Yu-Tong Liu Yun-Quan Wang Zhao-Hua Wei Zhi-Yi Zhang Jie Yuan Xiao-Hui Zhao Wei

Experimental study on Kα X-ray emission from intense femtosecond laser-solid interactions

Chen Li-Ming, Kazuhisa Nakajima, Toshi Tajima, Xu Miao-Hua, Li Yu-Tong, Liu Yun-Quan, Wang Zhao-Hua, Wei Zhi-Yi, Zhang Jie, Yuan Xiao-Hui, Zhao Wei
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  • Received Date:  06 February 2006
  • Accepted Date:  17 March 2006
  • Published Online:  08 January 2007

Experimental study on Kα X-ray emission from intense femtosecond laser-solid interactions

  • 1. (1)Advanced Photon Research Center,Japan Atomic Energy Research Institute,Kyoto,Japan,619-0215; (2)中国科学院物理研究所光物理实验室,北京 100080; (3)中国科学院物理研究所光物理实验室,北京 100080;中国科学院西安光机所瞬态光学国家重点实验室,西安 710068; (4)中国科学院西安光机所瞬态光学国家重点实验室,西安 710068

Abstract: The characteristics of Kα X-ray sources generated by p-polarized femtosecond laser-solid interactions are experimentally studied in the relativistic regime. By use of knife-edge image technique and a single-photon-counting X-ray CCD camera, we obtaine the source size, the spectrum and the conversion efficiency of the Kα X-ray sources. The experimental results show that the conversion efficiency of Kα photons reaches an optimum value of 7.08×10-6/sr at the laser intensity of 1.6×1018W/cm2, which is different from the Reich's simulation results (Reich et al., 2000 Phys. Rev. Lett. 84 4846). We find that about 10% of laser energy is converted into the forward hot electrons at the laser intensity of 1.6×1018W/cm2.

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