Two-dimensional performance of uniform irradiation with the use of an edge-softened lens array and spectral dispersion.
A lens array composed of edge-softened elements is used to improve on-target irradiation uniformity in the Shenguang II Laser Facility, with which a Fresnel pattern of suppressed diffraction peaks is obtained. Additional uniformity can be reached by reducing short-wavelength interference speckles inside the pattern when the technique of smoothing by spectral dispersion is also used. Two-dimensional performance of irradiation is simulated and the results indicate that a pattern of steeper edges and a flat top can be achieved with this joint technique.
Jiang
Xiujuan
X
National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China. jiang_x_j913@sohu.com
Zhou
Shenlei
S
Lin
Zunqi
Z
Zhu
Jian
J