| 摘要 |
A surface emitting laser is provided which requires a smaller number of components, and which can reduce the cost. A surface emitting laser includes a cavity constituted by a first reflecting mirror and a second reflecting mirror, and having a resonant wavelength that is changed by changing a cavity length with movement of the first reflecting mirror in a direction facing the second reflecting mirror. The surface emitting laser further includes an active layer arranged in the cavity and emitting light, a third reflecting mirror arranged on the opposite side of the active layer with respect to the second reflecting mirror, and a light receiving element arranged to receive light passing through the third reflecting mirror. |
