Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.
Phys Rev Lett. 2011 Jan 7;106(1):014801. doi: 10.1103/PhysRevLett.106.014801. Epub 2011 Jan 4.
We report on the acceleration of impurity-free quasimononenergetic proton beams from an initially gaseous hydrogen target driven by an intense infrared (λ=10 μm) laser. The front surface of the target was observed by optical probing to be driven forward by the radiation pressure of the laser. A proton beam of ∼MeV energy was simultaneously recorded with narrow energy spread (σ∼4%), low normalized emittance (∼8 nm), and negligible background. The scaling of proton energy with the ratio of intensity over density (I/n) confirms that the acceleration is due to the radiation pressure driven shock.
我们报告了一种从初始气态氢靶中加速产生纯净的准单能质子束的方法，该方法由强红外（λ=10 μm）激光驱动。通过光学探测观察到靶的前表面受到激光辐射压力的推动而向前运动。同时，我们还记录到了具有窄能散（σ∼4%）、低归一化发射度（∼8 nm）和可忽略的背景的 MeV 能量的质子束。质子能量与强度与密度之比（I/n）的标度关系证实了这种加速是由于辐射压力驱动的冲击波所致。
