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针对惯性约束聚变(ICF)等离子体诊断系统中对长焦深光学元件的要求,采用非线性相位拟合法设计了一块孔径150 mm,焦距450 mm,焦深5 mm的长焦深球面透镜.为了验证该方法的可行性和正确性,制作了一块与设计等F数(通光孔径为80 mm,焦距为240 mm)的长焦深透镜,并且测量了平行光经过该透镜后的轴上和横向光强分布.理论和实验结果都表明,采用非线性相位拟合法设计的长焦深透镜可以获得长焦深、小焦斑、小旁瓣的聚焦光束,可以满足诊断系统对长焦深元件的要求.
Aiming at the requirement of long focal depth optical element in inertial confinement fusion (ICF) plasma diagnosis system, a long focal spherical lens with 150 mm aperture, 450 mm focal length and 5 mm depth of focus was designed by nonlinear phase fitting method. The feasibility and correctness of this method were verified. A F-number of focal length (80 mm aperture, 240 mm focal length) telephoto lens was designed and the axial and Transverse light intensity distribution.The theoretical and experimental results show that the long focal depth lens designed by nonlinear phase fitting method can obtain the focused beam with long focal depth, small focal spot and small side lobes, Request.