Semiconductor laser element and semiconductor laser element array
US7447248B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2005 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | Mar 4, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a semiconductor laser element and the like which can efficiently emit laser beams at a small emission angle using a simpler configuration. The semiconductor laser element has a structure where an n-type cladding layer, active layer and p-type cladding layer are sequentially laminated. The p-type cladding layer has a ridge portion for forming a refractive index type waveguide in the active layer. The ridge portion, at least the portion excluding the edges, extends in a direction crossing each normal line of both end faces of the refractive index type waveguide, which corresponds to the light emitting face and light reflecting face respectively, at an angle θ, which is equal to or less than the complementary angle θc of the total reflection critical angle on the side face of the refractive index type waveguide. The optical paths of light components which resonate in the refractive index type waveguide formed by the ridge portion having the above form are limited to optical paths where the lights are totally reflected on the side face of the refractive index type waveguide. In other words, the laser beams emitted from the light emitting end have a spat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.