Low speckle noise monolithic microchip RGB lasers
US7457330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2006 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Nov 16, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for reducing speckle noise of a monolithic microchip laser with intracavity beam combining and sum frequency mixing is based on time averaging of uncorrelated speckle patterns generated from a large number of independent longitudinal modes and comprises schemes including selection of gain media and nonlinear optical materials to support broadband sum frequency mixing; adoption of gain-conjugated and/or chirped mirrors for flat-top spectra and/or mode phase diversification; multimode laser operation introduced by RF modulation; and multiplication of source modes in frequency mixing process featured with degeneration free and narrowed/uneven intervals. A device and an apparatus for generating low speckle noise red, green, blue lasers adaptable for color display systems are developed based on the inventive method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.