[2] FLORES A,WANG M R,YANG J J.Achromatic hybrid refractive-diffractive lens with extended depth of focus[J].Applied Optics,2004,43(30):5618-5630.

[4] LIU ZH Q,FLORES A,WANG M R,et al..Infrared imaging lens with extended depth of focus[J].SPIE,2005,5783:841-848.

[5] WANG H F,GAN F X.Phase-shifting apodizer for increasing focal depth[J].Applied Optics,2002,41(25):5263-5266.

[6] DOWSKI E R,CATHEY W T.Extended depth of field through wave-front coding[J].Applied Optics,1995,34(11):1859-1866.

[7] SOCHACKI J,BARA S,JAROSZEWICZ Z,et al..Phase retardation of the uniform-intensity axilens[J].Optics Letters,1992,17(1):7-9.

[8] STARONSKI L R,SOCHACKI J,JAROSZEWICZ Z,et al..Lateral distribution and flow of energy in uniform-intensity axicons[J].J.Opt.Soc.Am.A,1992,9 (11):2091-2094.

[9] SOCHACKI J,KOLODZIEJCZYK A,JAROSZEWICZ Z,et al..Nonparaxial design of generalized axicons[J].Applied Optics,1992,31(25):5326-5330.