Device and method for monitoring a light-emitting device
US4872176A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1988 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Apr 25, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/1215
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light emitting device which has a substrate and a cavity region overlying the substrate. The cavity region has a grating region overlying exposed portions of the surface formed of a first grating region having a first period and a second grating region having a period different from the first region. On other portions of the cavity region an active region overlies the cavity layer and a capping layer overlies the active region. The device is monitored by forming a surface emitting device with first and second gratings with the gratings having different periods. Current is applied to the device such that radiation is emitted from the grating and the output is detected from the second grating such that the current to the device is adjusted based on the output of the second grating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.