Devices and methods for optical imaging by means of off-axis digital holography
US11099522B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 30, 2018 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Apr 16, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2223/23
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
According to one aspect, the invention concerns an optical imaging device (20) for an object (OBJ) by off-axis holography comprising a light source (21) adapted for emitting an illumination wave (EI) on the object, in transmission or reflection, and an assembly formed by one or more thick Bragg gratings (22) for receiving a wave (EO) coming from the object thus illuminated and for deflecting a first component (ER) of the wave coming from the object, called the reference wave, and to allow a second component (ES) of the wave coming from the object, called the signal wave, to pass without deflection in such a way that the deflected reference wave presents predetermined deflection angles with respect to the non-deflected signal wave defined in two perpendicular planes. The imaging device according to the first aspect further comprises a two-dimensional detection device (23) for acquiring an interferogram resulting from the interference between said deflected reference wave and said signal wave and a computing unit for determining, from said interferogram, an amplitude and phase distribution of the signal wave in the plane of the object (hologram).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.