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

Sarah Bollanti; Paolo Di Lazzaro; Daniele Murra

doi:10.1117/12.316570

14 July 1998 Definition and measurement of the times-diffraction-limit number of high-power laser beams

Sarah Bollanti, Paolo Di Lazzaro, Daniele Murra

Proceedings Volume 3423, Second GR-I International Conference on New Laser Technologies and Applications; (1998) https://doi.org/10.1117/12.316570
Event: Second GR-I International Conference on New Laser Technologies and Applications, 1997, Olympia, Greece

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.

Citation Download Citation

Sarah Bollanti, Paolo Di Lazzaro, and Daniele Murra "Definition and measurement of the times-diffraction-limit number of high-power laser beams", Proc. SPIE 3423, Second GR-I International Conference on New Laser Technologies and Applications, (14 July 1998); https://doi.org/10.1117/12.316570

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