A wide aperture, X-ray preionized discharge pumped XeC1 laser, is described.
Before increasing the repetition rate, the laser performances are optimized without
any gas circulation.
The laser energy is given as a function of various parameters : delay time between
X-ray and laser pulses, repetition rate, gas mixture, X-ray dose, charging
voltage (Va), laser gas pressure and Vc/PL*D, (D is the interelectrode spacing).
The active medium is disturbed during about 3 seconds after the laser discharge
(confirmed by interferometry experiments). The laser energy per pulse is constant
with low fluctuations until a repetition rate of 0.3 Hz. The best efficiency, for
different pressures, is obtained for about the same Vc/PL*D value.
The laser energy and the efficiency increase with the buffer gas pressure. But
in this case, it is better to decrease the Xe and HC1 partial pressures. Laser
energy saturation versus X-ray dose depends on laser gas pressure and mixture.
This saturation is not reached for high pressures. Meanwhile more than 3 Joules
per pulse have been extracted from a 42*5*4 cm3 discharge.