Le Pape S, Zeitoun Ph, Idir M, Dhez P, Rocca J J, François M
Laboratoire de Spectroscopie Atomique et Ionique, Bâtiment 350, Université Paris-sud, 91405 Orsay, France.
Phys Rev Lett. 2002 May 6;88(18):183901. doi: 10.1103/PhysRevLett.88.183901. Epub 2002 Apr 18.
We report direct measurement of the electromagnetic-field spatial distribution in a neonlike Ar capillary discharge-driven soft x-ray laser beam. The wave front was fully characterized in a single shot using a Shack-Hartmann diffractive optics sensor. The wave front was observed to be dependent on the discharge pressure and capillary length, as a result of beam refraction variations in the capillary plasma. The results predict approximately 70% of the laser beam energy can be focused into an area 4 times the size of the diffraction-limited spot, reaching intensities of approximately 4 x 10(13) W/cm(2).
我们报告了对类氖氩毛细管放电驱动的软X射线激光束中电磁场空间分布的直接测量。使用夏克-哈特曼衍射光学传感器在单次测量中对波前进行了全面表征。由于毛细管等离子体中光束折射的变化，观察到波前取决于放电压力和毛细管长度。结果预测，大约70%的激光束能量可以聚焦到一个面积为衍射极限光斑4倍的区域，达到约4×10¹³W/cm²的强度。
