Optical element
US5898720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2/004
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical element and a method capable of electromagnetically inducing transparency in a solid. The optical element includes a solid having a number N of sites characterized by at least three energy levels including a first level higher than a second and a third lower than the second, and an excitation device configured to irradiate the solid with a first light having a wavelength corresponding to the energy difference between the first and the second level, and a second light having a wavelength corresponding to the energy difference between the first and the third level. The solid satisfies .sigma..sub.23 .ltoreq..sigma..sub.12 and .sigma..sub.23 .ltoreq..sigma..sub.13 where .sigma..sub.12, .sigma..sub.13 and .sigma..sub.23 are respectively the standard deviations of the energy differences between the first and second level, between the first and third level, and between the second and third level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.