Grating element and external-resonator-type light emitting device
US9859684B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2016 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | May 24, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/163
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A grating device includes a support substrate, an optical material layer 11 disposed on the support substrate and having a thickness of 0.5 μm or more and 3.0 μm or less, a ridge optical waveguide formed by a pair of ridge grooves in the optical material layer and having a light-receiving surface for receiving a semiconductor laser light and a light-emitting surface for emitting light having a desired wavelength, a Bragg grating 12 comprising convexes and concaves formed in the ridge optical waveguide, and a propagating portion 13 disposed between the light-receiving surface and the Bragg grating. The relationships represented by the following Formulas (1) to (4) are satisfied:0.8 nm≦ΔλG≦6.0 nm (1);10 μm≦Lb≦300 μm (2);20 nm≦td≦250 nm (3); andnb≧1.8 (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.