幫助中關(guān)于光柵的計(jì)算幫助時(shí)這樣寫(xiě)的 5RN!"YLI3  
Radial Polynomial Grating. The radial polynomial grating type is essentially a DOE defined by a rotationally symmetric phase profile. The phase profile is given by the following 20th order equation:[/td][/tr][/table]  Q&xH  
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The phase computed by the above equation is in lens units. The derivative of the phase gives the grating period at any point on the surface. The second order term (coefficient C1) gives the basic focal length of the DOE, with the focal length equal to: _*6]4\;  
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