Patent ID: 7940826
Filing Date: 2011-05-10
Classification: H01S

Abstract:
1. A surface emitting laser of an oscillation wavelength λ comprised of a lamination of a plurality of semiconductor layers on a substrate, the plurality of semiconductor layers including a first semiconductor multilayer minor, an active layer, and a photonic crystal having a refractive-index distribution in an in-plane direction of the substrate, wherein the photonic crystal is configured to diffract an incident light into a first diffracted light and a second diffracted light which is different in diffraction angle from the first diffracted light, when the incident light is of the oscillation wavelength λ and is incident from a vertical direction to the in-plane direction, wherein the first semiconductor multilayer minor has a stop band for each of the first diffracted light and the second diffracted light, which are diffracted by the photonic crystal, wherein the first diffracted light has an angle of zero degree with an incident direction of the incident light, and the second diffracted light has an angle with the incident direction of the incident light larger than zero degree and less than 90 degrees, and wherein, when an incident angle of the second diffracted light to a normal line of the first semiconductor multilayer mirror is taken as θ, a layer configuring the first semiconductor multilayer mirror has a thickness that is not an optical thickness of λ/4 and is not an optical thickness of λ/(4·cos θ).