<title>Designs of the resonators increasing the efficiency of laser oscillators</title>

Abstract

In this paper, on the basis ofliterature and the own works there has been made a review of various configurations of laser resonators, optical and electrooptical elements, leading to an enlargement ofTEM mode volume and to a smoothing of its transverse distribution of irradiance, both in a near and a far field. The special attention has been paid to an unstable resonator, "p-branch" type as well as to an output mirror with a radially variable reflection coefficient. Thus, there has been carried out some kind of review of methods of putting out a laser beam out of resonators. Moreover, in the paper there are summarized advantages and disadvantages of designs of the discussed resonators, causing the smoothing of a transversal distribution of irradiation in a laser beam.

<title>Selection of radiation parameters of lasers used for artwork conservation</title>

“…The laser systems used for deposits removal should have uniform distribution of energy density like so called "top hat". As it is known, uniformity of energy distribution in a laser beam cross-section depends on many factors, mainly on optical construction of laser resonator 12 .…”