Device for determining the intensity and phase of a coherent beam of light in a cross-section of the beam
AssigneeCommissariat a l'Energie Atomique
InventorLaurent Bruel
Life of this patent
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Abstract
A device for determining the intensity and phase of a coherent light beam (F) in a cross-section of the beam comprises a calculator (1), a camera (2), a detector plane (3), an optical sampling element (4), and two mirrors (5, 6). The device measures the intensity Ii (i=1, . . . N) of the beam in N planes (N≧3). The camera (2) is equipped with a single detector plane (3). The optical sampling element (4) and the two mirrors (5, 6) assemble N distinct elementary beams, generated based on the coherent light beam (F), on N distinct zones of the single detector plane (3).
Claims6
A device for determining the intensity and phase of a coherent light beam (F) in a cross-section of the beam, said device comprising:
- means for measuring intensity Ai (i=1, . . . N) of the beam in N planes, N≧3;
- based on an initial phase matrix φ1 corresponding to a plane i=1, calculating means programmed for:
- calculating complex amplitude matrix B1 by multiplying the phase matrix eiφ1 by a corresponding amplitude matrix A1;
- for each plane j>1:
- calculating a propagated complex matrix B′j based on the measured amplitude matrix Aj−1 of the plane j−1 and the phase matrix φ of the plane j−1;
- extracting a phase matrix from the plane j of the matrix B′j;
- iterating the aforesaid calculation by making j=1 when j−1=N, the means for measuring intensity Ai (i=1, . . . N) of the beam in N planes, N≧3, comprising means for forming N distinct elementary beams based on the coherent light beam,
- characterized in that the means for measuring the intensity Ai (i=1, 2, . . . N) comprise a single detector plane and in that the means for forming N distinct elementary beams comprise means for assembling the N distinct elementary beams on N distinct zones of the single detector plane.
Dependencies are inferred from the claim text.