Method and device for determining the distribution of intensity and phase in a laser beam different cutting planes

US6339469B1 · kind B1 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• Laurent Bruel · Pierrelatte, FR
• Jerome Belledent · Crolles, FR

Key dates

• Filing date: Dec 15, 2000
• Grant date: Jan 15, 2002
• Expiry date: Dec 15, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2226/13
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and device for determining the intensity and phase distribution of a coherent light beam, in a plane, including measuring the intensity Ii, i=1 . . . N, of the beam, in N planes, N≧3, having the plane wherein intensity and phase distribution is to be determined, choosing, for plane i=1, an initial phase matrix &phgr;1 and calculating a complex amplitude matrix, by term-wise multiplying the phase matrix ei&phgr;1 by the corresponding amplitude matrix A1, for each plane j>1: determining a propagated complex matrix B′j from the measured amplitude matrix Aj−1 of plane j−1 and the phase matrix &phgr; of plane j−1, extracting, from B′j, a phase matrix of plane j, and iterating the method up to convergence, with j=1 when j−1=N.