Nondegenerate two-photon absorption in silicon-based cameras
US12393005B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2021 |
| Grant date | Aug 19, 2025 |
| Priority date | — |
| Expiry date | May 8, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for infrared chemical imaging through nondegenerate two-photon absorption includes a step of providing pulsed or continuous wave radiation having pumping photons at near-infrared wavelength and providing pulsed or continuous wave radiation that having mid-infrared photons at a mid-infrared wavelength with peak intensities less than 50 W/cm2. The mid-infrared photons are directed onto a target sample. The method also includes a step of spatially and temporally overlapping the mid-infrared photons with the pumping photons. The mid-infrared photons and the pumping photons are directed onto a camera having an array or matrix of imaging devices. Characteristically, the sum of photon energy for each temporally and spatially overlapping mid-infrared photons and pumping photons is greater than or equal to the bandgap energy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.