Patent ID: 7102174
Filing Date: 2006-09-05
Classification: H01L,H01S,Y02E

Abstract:
1. A light emitting device comprising a substrate transparent at the emission wavelength and an active layer structure formed on such substrate, wherein the light emitting device has a first-conduction-type clad layer having the same conduction type as said substrate and a single first-conduction-type, low-refractive-index layer for suppressing spectral-intensity-modulation due to the substrate-mode, wherein said first-conduction-type clad layer is provided between said substrate and said active layer structure, wherein said first-conduction-type, low-refractive-index layer is provided between said substrate and said first-conduction-type clad layer, wherein a relation expressed by the following inequality is satisfied:  where n wherein the thickness of said first-conduction-type clad layer is 2.0 to 3.5 μm.