DIFFRACTION OPTICAL ELEMENT PRODUCING EFFECTIVE MULTIMODE FIBER EXCITATION AND REFLECTION CONTROL

摘要

PROBLEM TO BE SOLVED: To provide a diffraction optical element for producing effective multimode fiber excitation and effective reflection control.;SOLUTION: The optical element is a diffraction type transmission lens (14) for connecting a light source to a light transmission medium and has a diffraction face (160) demarcaded by a face function including a 1st phase function having symmetry about angles and a 2nd phase function having symmetry in a dynamic diameter direction and a cusp area and the cusp area has a discontinuous inclination.;COPYRIGHT: (C)2002,JPO