Since the advent of CO2 TEA lasers,1 high-efficiency TE lasers have made important progress with respect to energy, repetition rate, and even wavelength with excimer lasers2 emitting in the UV. One important problem with the laser is to avoid arc formation in the discharge. This can be done by é-beams but using fragile toils that cannot work at high repetition rates. It can also be done by UV photoionization through spark boards associated with a fast discharge, but that requires reliably switching very high peak intensities at high voltages with a spark gap or a Thyratron.

© 1982 Optical Society of America

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