| 摘要 |
PROBLEM TO BE SOLVED: To provide a diffracting optical element which can form a polygonal shape capable of maintaining high diffraction efficiency by a small number of straight lines when forming the polygonal shape similar to an ideal shape of a relief type diffracting optical element and can effectively suppress a flare, etc., when built in an optical system and the optical system composed of the diffracting optical element. SOLUTION: The diffracting optical element has a laminate structure wherein at least two or more layers of diffraction gratings are stacked; and the sectional phase of the diffraction grating is a relief type shape derived from a shape shift function by the polygonal shape obtained by connecting one or more straight lines in order and the sectional shapes of the diffraction gratings which are put one over another are similar.
|
