convert - converts the field from spherical into normal coordinate system.
converts the field from spherical variable coordinate system into normal coordinate system.
f1=begin(0.01,1e-6); f2=rect_ap(f1,0.005); f3=lens(f2,10); f4=lens_fresnel(f3,1.111111,1); f5=convert(f4); field_plot(f5);
Chen jingyuan, Gan guangyong (IAPCM, Beijing,China.)
lens , lens_forvard , lens_fresnel , convert ,