Focussed laser beam optical system
US4304467A · kind A · utility
3Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 29, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | May 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1013
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The focal range of a focussed laser beam is enlarged with a simple optical stop where the beam has a Gaussian cross-sectional profile. The stop is arranged between the laser producing the beam, and a beam focussing lens system, and it is provided with an aperture of predetermined diameter with respect to that of the laser beam whereby the outer portion of the beam represented by the low intensity skirts of the profile curve is stopped. This arrangement can influence the focal range up to a 75 percent increase over that obtained with the unstopped beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.