Visible light emitting vertical cavity surface emitting lasers
US5428634A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1992 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Nov 5, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/34326
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A vertical cavity surface emitting laser that emits visible radiation is built upon a substrate, then having mirrors, the first mirror on top of the substrate; both sets of mirrors being a distributed Bragg reflector of either dielectrics or other materials which affect the resistivity or of semiconductors, such that the structure within the mirror comprises a plurality of sets, each having a thickness of .lambda./2n where n is the index of refraction of each of the sets; each of the mirrors adjacent to spacers which are on either side of an optically active bulk or quantum well layer; and the spacers and the optically active layer are from one of the following material systems: In.sub.z (Al.sub.y Ga.sub.1-y).sub.1-z P, InAlGaAs, AlGaAs, InGaAs, or AlGaP/GaP, wherein the optically active region having a length equal to m .lambda./2n.sub.eff where m is an integer and n.sub.eff is the effective index of refraction of the laser cavity, and the spacer layer and one of the mirrors being transmissive to radiation having a wavelength of .lambda./n, typically within the green to red portion of the visible spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.