Coherent light generators – Particular beam control device
Patent
1989-01-27
1990-07-17
Scott, Jr., Leon
Coherent light generators
Particular beam control device
H01S 310
Patent
active
049425811
ABSTRACT:
A system is described for determining the phase relationship between two coherent beams and, if the beams are not in phase, providing a correction signal to bring them into phase. The system combines the beams to create an interference fringe pattern, the pattern exhibiting, if the beams are in phase, a central peak (zero order) irradiance fringe bounded on either side by lesser peak (higher order) irradiance fringes. The fringe pattern responds to a change in the relative phase of the beams by the fringes walking to the left or right under the stationary modulation envelope depending upon the direction of phase change between the beams. A pair of side fringe detectors are positioned to detect the lesser peak irradiance fringes but not the central peak irradiance fringe and to provide signals indicative of the power in each lesser peak irradiance fringe. A processor responsive to those signals, provides a correction output when the signals indicate unequal powers. A preferred embodiment OPD correction system is described and additionally includes a center fringe detector for detecting the central peak irradiance fringe as well as detectors for the lesser peak irradiance fringes. The central fringe output signal is applied to the processor which, in combination with the lesser peak irradiance fringe signals, is used by the processor to derive the correction output.
Harrell Sarah R.
Rowland John D.
Jr. Leon Scott
United Technologies Corp.
LandOfFree
Optical phase detection and control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical phase detection and control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical phase detection and control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-99404