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

Published online by Cambridge University Press:  01 October 1999

P. CHESSA ,
M. GALIMBERTI ,
A. BARBINI ,
C.N. DANSON ,
A. GIULIETTI ,
D. GIULIETTI  and
L. GIZZI
P. CHESSA
Affiliation:
LOA-ENSTA, Ecole polytechnique, 91128 Palaiseau cedex, France
M. GALIMBERTI
Affiliation:
IFAM-CNR, Via del Giardino, 7, 56127 Pisa, Italy
A. BARBINI
Affiliation:
IFAM-CNR, Via del Giardino, 7, 56127 Pisa, Italy
C.N. DANSON
Affiliation:
CLF, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon 0X11 0QX, UK
A. GIULIETTI
Affiliation:
IFAM-CNR, Via del Giardino, 7, 56127 Pisa, Italy
D. GIULIETTI
Affiliation:
Dipartimento di Fisica, Università degli Studi, Piazza Torricelli, 2, 56100 Pisa, Italy
L. GIZZI
Affiliation:
IFAM-CNR, Via del Giardino, 7, 56127 Pisa, Italy
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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.

Type
Research Article
Information
Laser and Particle Beams , Volume 17 , Issue 4 , October 1999 , pp. 681 - 692
Copyright
1999 Cambridge University Press

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