Abstract: An optical device includes a first optical component and a second optical component that are adjacent to each other in a direction of an optical axis. The optical device further includes a holding member that is formed with a resin material absorbing laser beams and that holds the first optical component via an elastic property of the resin material. The second optical component is formed with a resin material that allows the laser beams to pass and that is compatible with the resin material forming the holding member, and is fixed to the holding member by laser welding.

Abstract: 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.

Abstract: An optical device includes a first optical component and a second optical component that are adjacent to each other in a direction of an optical axis. The optical device further includes a holding member that is formed with a resin material absorbing laser beams and that holds the first optical component via an elastic property of the resin material. The second optical component is formed with a resin material that allows the laser beams to pass and that is compatible with the resin material forming the holding member, and is fixed to the holding member by laser welding.