Patent ID: 9093819
Filing Date: 2015-07-28
Classification: H01S

Abstract:
1. A surface-emitting laser comprising: a grating layer configured with a non-periodic, sub-wavelength grating, the grating comprising a pattern of sub-wavelength grating features being spaced apart from each other and having a defined refractive index that is approximately equal with respect to each other, the pattern of sub-wavelength grating features comprising a plurality of sub-regions of the sub-wavelength grating features, the sub-wavelength grating features within each sub-region having dimensions corresponding to a selected period and duty cycle that is distinct with respect to the other respective sub-regions of the plurality of sub-regions; a reflective layer; and a light-emitting layer disposed between the grating layer and the reflective layer, wherein the sub-wavelength grating and the reflective layer form a resonant cavity, and the grating is configured via the pattern of sub-wave-length grating features to shape one or more internal cavity modes and to shape one or more external transverse modes of light emitted from the surface-emitting laser, wherein the pattern of sub-wavelength grating features is a one-dimensional pattern of lines separated by grooves in each of the plurality of sub-regions.