Spatial filter for Q-switched lasers
US4043674A · kind A · utility
4Cited by
3References
3Claims
0Family size
Inventors
Key dates
| Filing date | Oct 2, 1974 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | Oct 2, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spatial filtered Q-switched laser system is disclosed having means to prevent ionization of air in close proximity to the aperture of the spatial filter. A compound lens system having an astigmatic focus is disposed between the laser and the spatial filter for defocusing the light beam emanating from the laser in the vicinity of the aperture of the spatial filter to an intensity below that which produces ionization of air. The preferred construction of the compound lens system as viewed from the laser comprises a cylindrical lens and a pair of positive lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.