A laser amplifier system amplifies pulses in a single "stage" from
.about.10.sup.-9 joules to more than 10.sup.-3 joules, with average power
of 1-10 watts, and beam quality M.sup.2 <2. The laser medium is cooled
substantially below room temperature, as a means to improve the optical
and thermal characteristics of the medium. This is done with the medium
inside a sealed, evacuated or purged cell to avoid moisture or other
materials condensing on the surface. A "seed" pulse from a separate laser
is passed through the laser medium, one or more times, in any of a variety
of configurations including single-pass, multiple-pass, and regenerative
amplifier configurations.
Un sistema dell'amplificatore del laser amplifica gli impulsi in una singola "fase" dai joule del about.10.sup.-9 a più dei joule 10.sup.-3, con un'alimentazione media di 1-10 watt e la qualità M.sup.2 del fascio
