Patent ID: 8810866

Claim:
An optical device, comprising: a surface emitting laser element having a surface emitting laser which emits a light in a direction which is perpendicular to a substrate face; a light receiving clement which monitors the light of the surface emitting laser; a package provided with a region on which the surface emitting laser element and the light receiving element are provided; a lid which has a window through which passes the light of the surface emitting laser, the window being formed of a transparent member, and which covers the surface emitting laser element and the light receiving element; a reflecting film provided on a lower face of the transparent member of the window onto which the light from the surface emitting laser element is incident, wherein the reflecting film partially reflects the light from the surface emitting laser element; and a reflection preventing film provided on an upper face of the transparent member of the window, wherein the upper face is opposite the lower face on which the first film layer is provided, and the reflection preventing film prevents reflection of a portion of the light that is not reflected by the reflecting film, and wherein the transparent member is provided at an angle which is tilted relative to the substrate face, and the lid is connected to the package such that the light emitted from the surface emitting laser is partially reflected at the reflecting film and is incident on the tight receiving element.