| 摘要 |
An optical apparatus includes a first member; and a second member adjacent to the first member in an optical axis direction. The first member is made of a material that transmits at least part of laser light, and includes a welding recess caving in toward the second member along the optical axis direction, the welding recess being formed on an aspect facing away from the second member along the optical axis direction. The second member is made of a material that is compatible with the material of the first member and that absorbs at least part of the laser light, and is fixed by laser welding to the first member at a position overlapping the welding recess along the optical axis direction.
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