Device for checking the position and/or the focusing of a focuse

Details Device for checking the position and/or the focusing of a focuse Device for checking the position and/or the focusing of a focuse

1995-04-24

1997-07-08

Palmer, Phan T. H.

Optical waveguides

Integrated optical circuit

385 31, 385 49, 356121, 356122, G02B 612

Patent

active

056470312

ABSTRACT:
A device is provided for checking the positioning and/or the focusing of a focused light beam. This integrated optical device for checking the positioning and/or the focusing of a focused light beam having an integrated optics guidance structure includes a multimode waveguide or an array of monomode guides distributed so as to be able to exchange energy. The waveguide or monomode guide array is integrated into the guidance structure and is able, when the distribution of the light beam directed at the input of the guide or the array of guides has a single maximum, to transform the distribution into a distribution having N (N.gtoreq.2) maxima at the output of the guide or array of guides. The guideance structure fruther includes a detector for measuring the distribution of the intensity at the output of the waveguide or monomode guide array, and an analyzer for analyzing the intensity distribution connected to the detector.

REFERENCES:
patent: 4796226 (1989-01-01), Valette
Self-imaging In Homogeneous Planar Optical Waveguide--Ulrich et al--Applied Physics Letters, vol. 27, no. 6, 15 Sep. 1975--pp. 337-339.
Transparent Boundary Condition For Beam Propagation--Hadley--1991 Optical Society of America--pp. 624-626 No Month.
Resolution Of Self-Images In Planar Optical Waveguides--Ulrich et al--J. Opt. Soc. Am., vol. 68, No. 5, May 1978--pp. 583-592.
Light Propagation In Graded-Index Optical Fibers--Feit et al--Applied Optics, vol. 17, No. 24, 15 Dec. 1978--pp. 3990-3998.
The National Optics Institute Introduces BPM.sub.-- CAD--NOI Bulletin, Nov. 1991, Quebec, Canada.
An Assessment Of Finite Difference Beam Propagation Method--Chung et al--IEEE Journal of Quantum Electronics, vol. 26, No. 8, Aug. 1990--pp. 1335-1339.

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