| 摘要 |
PURPOSE:To obtain a functional optical element having no dependency on the polarization characteristic of used light by forming a phase diffraction grating arranging two substances having optical axes different to each other alternately. CONSTITUTION:A functional optical element is formed of triangular wave grating using a substance 1 and 2. The optical axis of the substance 1 is arranged in the direction of grooves of the grating and the optical axis of the substance 2 is arranged in the direction of the row of the grating. A rectangular grating is formed in the element using the substances 1 and 2. Further, the optical axis of the substance 1 is arranged in the direction of the grooves of the grating and the optical axis of the substance 2 is arranged in the perpendicular direction to the arranged surface of the grating. Such substances having the specified optical axes are those represented by so-called optically anisotropic substances such as LiNbO3, LiTaO3, PLZT, liquid crystal, SiO2, CdS, CaCO3, ZrO2, Al2O3, MgF2, etc. The two substances for forming a phase diffraction grating may be different to each other or same.
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