Far-infrared spectroscopic device and far-infrared spectroscopic method
US11016023B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2017 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Aug 22, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/4707
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an is-TPG method in which lasers having two different wavelengths are used to generate a wavelength-variable far-infrared light, a far-infrared light (TPG light) having an unstable output at a broad wavelength is also slightly generated at the same time with only one laser light. The generated is-TPG and the TPG light are converted, after passing through a specimen, to near-infrared light inside a nonlinear optical crystal for detection and are observed by a detector. The signal light output of the is-TPG light becomes unstable due to the TPG light. According to the present invention, the TPG light is removed by means of a slit and the like (filter) immediately before the specimen and is not introduced into the nonlinear optical crystal for detection. At this time, by using a change in the emission direction when the frequency of the is TPG light is changed, the filter is moved in accordance with the frequency so that only the is-TPG light passes therethrough (see FIG. 1C).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.