在激光等离子体相互作用实验中测量到的加速质子，来源于薄膜靶表面的碳氢沾染物。为了提供稳定充足的质子源，设计一种新的复合靶，在2.5 μm塑料溅射200 nm 金薄层形成双层靶，并在中等强度激光功率密度下开展研究，采用磁谱仪和CR-39探测器测量得到其能谱，结果表明：双层靶结构能够有效地增加质子的产额，并可能改善加速质子束的单能性。

Accelerated protons in laser-plasma interactions are originated from the hydrocarbon contaminant affiliating on the target surface. A novel scheme of double-layer target is proposed to provide a stable and strong proton source. The Double-layer targets were designed and manufactured by sputtering 200 nm thick Au on 2.5 μm thick Mylar films. The measurement of proton beams in laser-plasma interaction was done by magnetic spectrometer and CR-39 solid state nuclear track detectors. The experimental results suggest that the double-layer target can efficiently increase the yield of protons, and may improve the quality of proton beams.