Method and apparatus for generating a phase-modulated wave front of electromagnetic radiation
US6842285B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2001 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Dec 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2240/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a method and a system for generating a phase-modulated wave front. According to the present invention, the spatial phase-modulation is not performed on the different parts of the wave front individually as in known POSLMs. Rather, the spatial phase-modulation of the present invention is performed by generating an amplitude modulation in the wave front, Fourier or Fresnel transforming the amplitude modulated wave front, filtering Fourier or Fresnel components of the Fourier or Fresnel distribution with a spatial filter such as a phase contrast filter, and regenerating the wave front whereby the initial amplitude modulation has transformed into a phase-modulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.