Optical element, laser device and method for manufacturing optical element

A method for manufacturing an optical element, the method comprising:

• a preparation step of preparing a first component including a laser medium and a second component including a heat sink including a metal;
• and
• a joining step of joining the first component and the second component, wherein
• the preparation step has
• a step of forming a first intermediate layer on the laser medium, and
• a step of forming a first metal layer including a Group 4 element or a Group 6 element on the first intermediate layer,
• in the joining step, the first component and the second component are joined via the first metal layer,
• the first intermediate layer includes a dielectric multilayer film that is formed on the laser medium and totally reflects laser light generated or amplified by the laser medium, and
• in the step of forming the first intermediate layer, the first intermediate layer is formed such that a thickness of the first intermediate layer is thicker than a protrusion length of an evanescent wave generated by reflection of light incident from the laser medium side by the dielectric multilayer film.