System and method for testing the reaction of rare earth ions
US4333344A · kind A · utility
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9Claims
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Key dates
| Filing date | Oct 28, 1980 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Oct 28, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0255
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A crystalline bar is doped with a rare earth. The bar is transparent to ration, such as from a laser, at a light wavelength which excites the rare earth ions in the bar and the light is modulated at the frequency at which the bar mechanically resonates. The excited ion decay radiatively by light or non-radiatively by phonons. As the phonons decay, they excite the bar to resonate mechanically. The mechanical resonance may be coupled by a piezoelectric material and measured to give information respecting the phonon activity of the excited rare earth ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.