双脉冲驱动锗薄膜靶高增益X射线激光实验

EXPERIMENT OF HIGH GAIN X-RAY LASER FROM DOUBLE-PULSE DRIVEN Ge FOIL TARGET

利用窄脉宽,低能量并具有一定时间间隔的两束激光脉冲驱动薄膜锗靶,获得高增益X射线激光的实验方法和结果,每束入射激光能量仅几十焦耳,脉宽100—160ps,两脉冲时间间隔35Ops,所用的靶为锗薄膜靶,其长为10mm,厚为34.0nm,实验中利用掠人射光栅谱仪观测到类氖锗3s—3P J=0—1和J=2—1两条激光线,它们的波长分别为19.61nm和23.63nm,折射角均为12mrad,人发散用分别小于10.8mrad和17.8mrad.

An experimental method that obtained high gain X-ray laser by lower energy double-pulse with a time separation driven Ge foil targets, and experimental results are described. The experiment was performed at 'Shenguang' laser facility in Shanghai, Energy of two pulses amounts to about 100J the FWHM of the pulses is 100-160ps, the time separation between two pulses is 350ps. The material of target is pure germanium, its thickness is about 34.0nm. Two laser lines of 3s-3p transition from Ne-like Ge ions are experimentally measured with a grazing incidence grating spec-trograph. Their wavelength is 19.61nm and 23.63nm, respectively. Both of the deflection angles are equal to 12mrad, their devergence angle is less than l0.8mrad and 17.8mrad, respectively.