We present the results of a detailed experimental study of the operation of two Gen-eralized Self-Filtering Unstable Resonators applied respectively to two different UV-preionized excimer lasers. By applying a G-SFUR with magnification |M|=10 to a short pulse XeC1 laser, a diffraction limited laser beam of 3.5 mJ, 11 ns duration and with a brightness of 4.8 x 1013 W cm-2 Sr-1 has been obtained. With a G-SFUR having |M|=20 applied to a longer pulse XeCl laser a diffraction limited beam of 21 mJ, 18 ns duration and with a brightness of 2.1 x 1014 W cm-2 Sr-1 has been obtained. The effect of the filtering aperture dimension on the output beam energy and divergence has been also investigated.
M. R. Perrone,
"Generalized Self-Filtering Unstable Resonators Applied To XeCl Lasers", Proc. SPIE 1023, Excimer Lasers and Applications, (26 April 1989); doi: 10.1117/12.950139; https://doi.org/10.1117/12.950139