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Proceedings Paper

Definition and measurement of the times-diffraction-limit number of high-power laser beams
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Paper Abstract

A novel definition of the times-diffraction-limit (TDL) number of a laser beam is given. A comparison is made with the commonly used beam-propagation parameter M2, which is unreliable for hard-edge beams, like those produced by unstable resonators with diffraction output coupling. The new suggested TDL number definition doesn't rely on the real beam comparison to a Gaussian beam, but on the comparison of the far-field performances of the real beam with respect to those of a uniphase beam with the same amplitude profile in the near field. A practical method is also given for the estimation of the TDL number of real beams. Finally, this procedure is applied to the high-peak-power laser beams generated by two excimer laser systems developed in ENEA.

Paper Details

Date Published: 14 July 1998
PDF: 6 pages
Proc. SPIE 3423, Second GR-I International Conference on New Laser Technologies and Applications, (14 July 1998); doi: 10.1117/12.316570
Show Author Affiliations
Sarah Bollanti, ENEA Frascati (Italy)
Paolo Di Lazzaro, ENEA Frascati (Italy)
Daniele Murra, ENEA Policoro (Italy)


Published in SPIE Proceedings Vol. 3423:
Second GR-I International Conference on New Laser Technologies and Applications

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