| 摘要 |
A vertical external cavity surface emitting laser is provided to improve light extraction efficiency in a quantum well layer by restricting overflow of an electron and a hole and confining the electron and a hole in the quantum well layer through a first barrier layer. In an optimal pumping type vertical external cavity surface emitting laser having a multi-quantum well structured active layer(22) in a resonator, the active layer is composed of plural first barrier layers(22a) periodically arranged in the active layer and made of materials having an energy band gap larger than a band gap of the optimal pumping light; plural multi-quantum well layers(22c) interposed between the first barrier layers, respectively and composed of at least one quantum well layer; and second barrier layers(22b) arranged at both surfaces of each quantum well layer. The first and second barrier layers are doped with n-type dopant. |
