Method and apparatus for providing a phase compensated optical beam
US4005935A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Jul 31, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/66
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
According to one herein disclosed embodiment, an initial uncompensated energy pulse is transmitted towards a remotely located target; a portion of the energy reflected from the target is received, processed so as to be back-scattered from a Brillouin mirror, amplified and then retransmitted along a path coincident with the received path. The backscattered energy from the Brillouin mirror is the complex phase conjugate of the received pulse and consequently the second transmitted pulse is phase encoded such that the effects of phase perturbations encountered along the received path are substantially canceled, and near diffraction-limited convergence of the beam upon the target is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.