DIFFRACTION OPTICAL SYSTEM AND OPTICAL DEVICE

摘要

A diffraction optical system which includes a diffraction optical element is provided with a concave lens component having a first diffraction optical surface, and an optical member having a second diffraction optical surface. The concave lens component and the optical member are arranged so that the first diffraction optical surface and the second diffraction optical surface face each other. The diffraction optical system meets the conditions expressed by an inequality of 0.003