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US 5,192,982 AGranted
Coded-fringe interferometric method and device for wavefront detection in optics
AssigneeOffice Galileo S.p.A.
InventorAntonio Lapucci
Life of this patent
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Abstract
For the detection of the wavefront of a beam, based on a Mach-Zehnder interferometric configuration, synchronous detection - which replaces a temporal scan or a spatial dimension of the array of sensors - is obtained by means of frequency coding of the fringes present in the function I(x,y).
Claims17
A method for detection of a wavefront of a beam, the method comprising the steps of:
- providing a Mach-Zehnder interferometric configuration;
- constructing a different spacial carrier frequency for each y value in an intensity function I(x,y);
- frequency coding phase information of a plurality of transverse profiles in said spacial carrier frequency of fringes present in said intensity function I(x,y);
- acquiring a signal representing a section of said intensity function I(x,y) parallel to an x axis;
- and
- processing a low frequency portion of said signal, said low frequency portion being centered around a spacial carrier frequency, said processing using Fourier analysis techniques in order to reconstruct a phase of the beam and thus detect the wavefront of the beam.
3 more elements
A device for detection of a wavefront of a beam, the device comprising:
- a Mach-Zehnder interferometric configuration;
- means for constructing a different spacial carrier frequency for each y value in an intensity function I(x,y);
- means for frequency coding phase information of a plurality of transverse profiles in said spacial carrier frequency of fringes present in said intensity function I(x,y);
- sensor means for acquiring a section of said intensity function I(x,y) parallel to an x axis;
- and
- processing means for processing a low frequency portion of said signal, said low frequency portion being centered around a spacial carrier frequency, said processing means using Fourier analysis techniques in order to reconstruct a phase of the beam and thus detect the wavefront of the beam.
3 more elements
A method for detection of a wavefront of a beam, the method comprising the steps of:
- providing a Mach-Zehnder interferometric configuration;
- providing different misalignment contributions at different ordinates between the beam and a reference beam in said Mach-Zehnder interferometric configuration;
- constructing a different spacial carrier frequency for each y value in an intensity function I(x,y);
- frequency coding phase information of a plurality of transverse profiles in said spacial carrier frequency of fringes present in said intensity function I(x,y);
- acquiring a signal representing a section parallel to an x axis of said intensity function I(w,y) with a single sensor;
- and
- processing a low frequency portion of said signal, said low frequency portion being centered around a spacial carrier frequency, said processing using Fourier analysis techniques in order to reconstruct a phase of the beam and thus detect the wavefront of the beam.
4 more elements
Dependencies are inferred from the claim text.