Long pulse excimer lasers are of interest as a means for increasing, with constant energy, the impulse coupled to a target. The reduced power associated with the long pulse width also increases the laser optics damage threshold. A direct e-beam pumped XeC1 laser has been operated with a 5 p's pulse length. The e-beam pump is a cold cathode, large area diode which has operated up to 10 μs pulse width. Fuel burn-up of the halogen donor occurs at approximately the same specific pump energy (J/ℓ ) observed with microsecond pulse lengths.
Gary L. McAllister,
Richard G. Morton,
William K. Richardson,
"Long-Pulse E-Beam Pumped Excimer Laser", Proc. SPIE 0710, Excimer Lasers and Optics, (11 March 1987); doi: 10.1117/12.937307; https://doi.org/10.1117/12.937307