| 摘要 |
PROBLEM TO BE SOLVED: To provide a diffraction optical element capable of maintaining high diffraction efficiency in a wide wavelength range even when the temperature changes. SOLUTION: In the diffraction optical element 1, a glass material 27 and a resin material 26 having a refractive index change dn/dT with respect to the temperature larger than that of the glass material, adhere or are opposed to each other, and a diffraction grating is formed in the adhering part or opposed part of the glass material and the resin material. The resin material comprises a resin base material 30 containing first fine particles 31 made of a first material satisfying dn/dT≥-1×10<SP>-5</SP>(/°C) and second fine particles 32 made of a second material having higher dispersion than that of the glass material. COPYRIGHT: (C)2010,JPO&INPIT |
