Phase measurements without interferometry: 2D transverse phase detection by numerical beam intensity analysis

Year: 1999

Authors: Chessa P., Galimberti M., Barbini A., Danson CN., Giulietti A., Giulietti D., Gizzi LA.

Autors Affiliation: Ecole Polytech, LOA ENSTA, F-91128 Palaiseau, France;
CNR, Ist Fis Atom & Mol, I-56127 Pisa, Italy;
Rutherford Appleton Lab, CLF, Didcot OX11 0QX, Oxon England;
Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy

Abstract: A whole family of laser-plasma interaction experiments is based on the phase analysis of the laser pulse after the propagation in a plasma. Typically, this phase is obtained by means of interferometry. As pulsed interferometry is a much more difficult task than taking simple images of the beam, we developed a numerical code for extracting phase information from images. The technique, based on the algorithm of Gerchberg-Saxton, showed to be very effective in retrieving 2D phase distributions of simulated as well as real beams. The convergence of the algorithm is fast (some minutes on a personal computer). The electronic noise in real images is intrinsically discarded by the algorithm.


Volume: 17 (4)      Pages from: 681  to: 692

KeyWords: retrieval; algorithms;
DOI: 10.1017/S0263034699174135

Citations: 3
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