Patent ID: 6778578
Filing Date: 2004-08-17
Classification: H01S

Abstract:
A multi-wavelength surface emitting laser for emitting light having a first wavelength and light having a second wavelength, the laser comprising:a substrate; a first surface emitting laser which emits light having the first wavelength, directly formed on a portion of an upper surface of the substrate and including, a first lower reflector formed of two alternately deposited semiconductor material layers having a same type of impurity, but different refractive indices, the first lower reflector disposed on the upper surface of the substrate; a first active layer disposed on the first lower reflector; and a first upper reflector formed of two deposited semiconductor material layers having different refractive indices and an opposite type of impurity to that of the first lower reflector, the first upper reflector disposed on the first active layer; a second surface emitting laser which emits light having the second wavelength, directly formed on a portion of an upper surface of the substrate neighboring the first surface emitting laser and including; a second lower reflector formed of two alternately deposited semiconductor material layers having different refractive indices and a same type of impurity, the second lower reflector disposed on the upper surface of the substrate; a second active layer disposed on the second lower reflector; and a second upper reflector formed of two deposited semiconductor material layers having different refractive indices and an opposite type of impurity to that of the second lower reflector, the second upper reflector disposed on the second active layer; a lower electrode layer disposed on a lower surface of the substrate; a first upper electrode formed on the first upper reflector, which electric power is applied to; and a second upper electrode formed on the second upper reflector, which electric power is applied to; wherein the first and second surface emitting lasers commonly use the substrate and the lower electrode; and wherein each of the first lower reflector, the first active layer and the first upper reflector of the first surface emitting laser are apart and formed independently from each of the second lower reflector, the second active layer and the second upper reflector of the second surface emitting laser.