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Method for measuring optical characteristics of diffraction optical element and apparatus for measuring optical characteristics of diffraction optical element
Method for measuring optical characteristics of diffraction optical element and apparatus for measuring optical characteristics of diffraction optical element
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机译:测量衍射光学元件的光学特性的方法和测量衍射光学元件的光学特性的设备
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摘要
A measurement method and an evaluating apparatus are provided which accurately evaluate the light amount of a spot beam, the diffraction efficiency, and the intensity distribution in the optical axis direction by detecting even a weak diffracted beam in an arbitrary wavelength range converged by a diffraction optical element as an imaging lens. Light emitted from a white light source passes through a wavelength band-pass filter and is diaphragmed by a pinhole slit. The resultant light is paralleled by a collimator lens and enters a diffraction optical element as an imaging lens. The light getting out from the diffraction optical element is converged to be a spot beam, is magnified by a microscope 18, and is then projected on a CCD. A distance changing member changes the distance between the CCD and the diffraction optical element, and then, the intensity distribution in the optical axis direction is measured.
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