Optical system comprising a diffractive optical element, and method of designing the same
First Claim
1. An optical system, characterized by comprising a transmission blaze grating constructed of a relief having a sawtooth shape in section and satisfying the following relationships:
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Abstract
The invention relates to a method of easily and quantitatively determining the diffraction efficiency of a relief type diffraction optical element, and provides a method of designing an optical system comprising a diffractive optical element using diffraction efficiency as at least one estimation index. The diffractive optical element is a transmission blaze grating constructed of a relief having a sawtooth shape in section. The transmission blaze grating having a side wall substantially vertical to a grating surface. The estimation index is given by a predetermined mathematical expression including at least a phase difference due to a relief discontinuity and shadow effects thereof. The mathematical expression includes as the shadow effects of said discontinuity at least a light attenuation effect dependent on an angle-of-incidence and a light attenuation effect independent on the angle-of incidence in a separate manner.
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Citations
2 Claims
- 1. An optical system, characterized by comprising a transmission blaze grating constructed of a relief having a sawtooth shape in section and satisfying the following relationships:
Specification