飞秒激光与薄膜Cu靶作用时质子能谱实验  

Energy spectrum experiment on protons generated by interaction between femtosecond laser and 7 μm copper foil target

作　　者：陈晓旭[1] 唐翠明[1] 洪伟[2] 谷渝秋[2] 何颖玲[2] 

机构地区：[1]四川理工学院理学院,四川自贡643002 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2012年第10期2335-2337,共3页High Power Laser and Particle Beams

基　　金：四川省教育厅科研项目(11ZB254;12ZB290);四川理工学院理学院科研项目(09LXYB04)

摘　　要：采用飞秒激光辐照固体薄膜Cu靶的方式对质子束的产生及质子束能谱开展了实验研究。在SILEX-Ⅰ飞秒激光装置上,保持脉宽为30fs不变,测量了不同激光能量和功率密度下辐照7μm Cu靶时的质子能谱。研究结果表明:质子沿着靶背法线方向发射,质子在一定能量处出现截断;随着质子束能量的增加,质子束流减小;轰击厚为7μm的Cu靶时,激光能量越大则质子束流越强;随着激光功率密度的增加,质子截止能也随之增加。An experimental study on protons from a 7 μm thick copper foil target irradiated by femtosecond laser pulses has been carried out. In the SILEX- I femtosecond laser device, the proton energy spectra are measured at the different laser energies and laser power densities and at the same pulse width of 30 fs. Results show that the protons are emitted in the normal direction of the target back and have a certain cut-off energy. Along with the increase of the proton energy, the proton beams exponentially decay. For the same 7 μm thick Cu target, the greater the laser energy is, the stronger the proton beams are. With the increase of the laser power density, the cut-off energy of protons increases.

关 键 词：飞秒激光 质子 能谱 Thomson磁谱仪 

分 类 号：O434.12[机械工程—光学工程] TL65[理学—光学]