Mode discrimination apparatus
US4519708A · kind A · utility
14Cited by
6References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1981 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | May 20, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an optical system such as a ring laser gyroscope cavity, oscillations occur in many transverse modes. The desired modes are allowed to exist by suppressing undesired modes utilizing a light stop apparatus. One light stop is made by treating a dielectric mirror with an electron beam causing a phase change to occur to the undesired reflected waves. An alternative light stop is made by depositing an absorptive material on a dielectric mirror for absorbing some of the energy of the undesired modes. Both light stop embodiments are adjustable with respect to a laser wave in a resonant cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.