SEMICONDUCTOR DEVICE PROVIDED WITH CHIRP LIGHT REFLECTION LAYER

摘要

PURPOSE:To prevent a chirp light reflection layer from deteriorating in reflectivity to light of shorter wavelengths due to the absorption of light by the semiconductor which forms the reflection layer concerned. CONSTITUTION:Unit semiconductors formed of two types of semiconductors different from each other in composition are repeatedly laminated to form a light reflection layer 14a widened in wavelength of reflection light by varying the unit semiconductors in thickness, where the unit semiconductors which reflect light of shorter wavelengths are provided to the upper part of the layer 14a or the light incident side of the layer 14a.