Patent ID: 7102177
Filing Date: 2006-09-05
Classification: H01L

Abstract:
1. A light-emitting device, comprising: a semiconductor light-emitting die; a gradient index (GRIN) element having a cylindrical refractive index profile in which the refractive index varies radially and is substantially constant axially, the GRIN element comprising a first end surface opposite a second end surface and further comprising a cylindrical body having a first diameter, the cylindrical body characterized by a length-to-pitch ratio, the GRIN element arranged with the first end surface adjacent the light-emitting die to receive light therefrom and emitting the light from the second end surface in a radiation pattern dependent on the length-to-pitch ratio; a header comprising a cavity extending thereinto, the cavity having a second diameter slightly smaller than the first diameter, the light-emitting die mounted in the cavity defined by the header; and a push fit hermetic seal defined by an assembly comprising the GRIN element engaged in the cavity.