Patent ID: 8969113
Filing Date: 2015-03-03
Classification: B82Y,H01S

Abstract:
1. A method for manufacturing an optical device, the method comprising: providing a gallium and nitrogen containing substrate member having a semipolar crystalline surface region, the gallium and nitrogen containing substrate member having a thickness of less than 500 microns, the gallium and nitrogen containing substrate member characterized by a dislocation density of less than 10 forming a surface reconstruction region overlying the semipolar crystalline surface region, the surface reconstruction region having an oxygen bearing concentration of greater than 1E17 cm forming an n-type cladding layer comprising a first quaternary alloy, the first quaternary alloy comprising an aluminum bearing species, an indium bearing species, a gallium bearing species, and a nitrogen bearing species overlying the semipolar crystalline surface region, the n-type cladding layer having a thickness from 100 nm to 4000 nm with an n-type doping level of 1E17 cm forming a first gallium and nitrogen containing epitaxial material comprising a first portion characterized by a first indium concentration, a second portion characterized by a second indium concentration, and a third portion characterized by a third indium concentration overlying the n-type cladding layer; forming an n-side separate confining heterostructure (SCH) waveguiding layer overlying the n-type cladding layer, the n-side SCH waveguiding layer comprising InGaN with a molar fraction of InN of between 1% and 8% and having a thickness from 30 nm to 150 nm; forming a multiple quantum well active region overlying the n-side SCH waveguiding layer, the multiple quantum well active region comprising two to five InGaN quantum wells having a thickness from 2.0 nm to 4.5 nm and being separated by gallium and nitrogen containing barrier layers having a thickness from 7.5 nm to 18 nm; forming a p-side guide layer overlying the multiple quantum well active region, the p-side guide layer comprised of GaN or InGaN and having a thickness from 20 nm to 100 nm, the InGaN having a molar fraction of InN of between 1% and 5%; forming a second gallium and nitrogen containing material overlying the p-side guide layer; forming a p-type cladding layer comprising a second quaternary alloy overlying the second gallium and nitrogen containing material, the p-type cladding layer having a thickness from 300 nm to 1000 nm with a magnesium doping level of 1E17 cm causing formation of a plurality of hydrogen species, the plurality of hydrogen species spatially disposed within the p-type cladding layer; and forming a p++ gallium and nitrogen containing contact layer overlying the p-type cladding layer, the p++ gallium and nitrogen containing contact layer having a thickness from 10 nm to 100 nm and a magnesium doping level of 2E19 cm forming a waveguide member using an etching process, the waveguide member being aligned substantially in a projection of the c-direction, the waveguide member comprising a first end and a second end, the waveguide member having a first edge region formed on a first side of the waveguide member, the waveguide member having a second edge region formed on a second side of the waveguide member; maintaining the etching process from causing any damage to the multiple quantum well active region; forming a first facet on the first end, the first facet being characterized by a first semipolar characteristic; and forming a second facet on the second end, the second facet being characterized by a second semipolar characteristic; whereupon the waveguide member is provided between the first facet and the second facet, the waveguide member having a length of greater than 300 microns and configured to emit substantially polarized electromagnetic radiation such that a polarization is substantially orthogonal to the waveguide member direction and the polarized electromagnetic radiation having a wavelength of 500 nm and greater and a spontaneous emission spectral full width at half maximum of less than 50 nm in a light emitting diode mode of operation.