Beam forming telescope with polarization correction
US7019902B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2002 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Oct 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/2232
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An optical system for reforming a laser beam with azimuthal polarization having X and Y components into a beam with linear polarization has a multiplicity of optical elements, at least one of which has a mirror having an absorbing thin film reflective coating to remove the Y-component of the azimuthal beam polarization, thereby reflecting only the X or linear component as a linearly polarized beam. The absorbing thin film reflective coating is comprised of a plurality of layers alternately having high and low indices of refraction. The optical elements include a spatial filter and the beam is passed through the spatial filter to adjust the beam quality. At least one other optical element is collimating and the beam with adjusted beam quality is transmitted to the collimating element to effect its collimation. The collimated linearly polarized laser beam may thereafter be passed through a phase shifter to convert the polarization of the laser beam from linear to circular.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.