Manufacturing method of optical low pass filter
A technology of low-pass filters and manufacturing methods, applied in optics, optical components, nonlinear optics, etc., can solve problems such as time-consuming, reduced production efficiency, and poor production efficiency
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[0039] Hereinafter, embodiments of the method for manufacturing an optical low-pass filter of the present invention will be described, but the present invention is not limited to the following embodiments.
[0040] As an optical low-pass filter to be used in the method of manufacturing the optical low-pass filter of the present invention, a structure in which a 1 / 4 wavelength plate made of a polymer film is sandwiched between two birefringent plates can be cited. A 3-story structure of the vertical attachment type. A crystal plate having predetermined crystal planes is generally used as a birefringent plate. Examples of the polymer film constituting the 1 / 4 wavelength plate include uniaxially stretched plastic films. The 1 / 4 wavelength plate has the function of transforming the polarization state of incident light from linear polarization to circular polarization. A uniaxially stretched polymer film having a predetermined thickness has a characteristic that the birefringence...
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