Patent ID: 7486714

Claim:
A vertical external cavity surface emitting laser (VECSEL) comprising: a first active layer that has a quantum well structure and generates light with a first wavelength; a reflection layer located adjacent to a first surface of the first active layer, wherein the reflection layer reflects light of the first wavelength generated by the first active layer and reflects light of the first wavelength generated by the first active layer; an external mirror that is separated by a predetermined distance from a second surface of the first active layer, transmits a portion of light generated by the first active layer to the outside, and reflects the rest of the light generated by the first active layer to be absorbed by the first active layer, wherein the first active layer, the reflection layer and external mirror comprise a surface emitting laser unit; and a pump laser disposed on the reflection layer as a single body with the reflection layer and first active layer to provide light with a second wavelength that is shorter than the first wavelength to the first active layer for optical pumping, wherein the reflection layer transmits to the first active layer a portion of the light with the second wavelength generated by the pump laser and reflects to the pump laser the rest of the light with the second wavelength generated by the pump laser, wherein the reflection layer is a shared cavity mirror with the pump laser unit and the surface emitting laser unit.