Method and apparatus for upshifting light frequency by rapid plasma creation
US4975655A · kind A · utility
25Cited by
4References
15Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 14, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Jun 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photons of an electromagnetic source wave are frequency-upshifted as a plasma is rapidly created around the path of this propagating source wave. The final frequency can be controlled by adjusting the gas density. A controlled time-varying frequency (chirped) pulse can be produced by using a controlled spatially varying gas density. The plasma must be created in a time which is short compared to the transit time of the light through the plasmas region. For very fast creation over one to at most a few light periods of an overdense plasma, static magnetic fields with short wavelengths are created.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.