Abstract
In the powerful optical amplifiers the problem of the beam wave front distortion and control of the beam profile acquires importance. Laser radiation frequency can be shifted from tenths to thousandths wavenumbers using Stimulated Raman scattering (SRS) in crystals, and that opens additional facilities for creation of seed radiation source for required optical amplifier. However, spatial coherence of SRS beam can be considerably deteriorated due to fundamental reasons [1]. In the present work we experimentally study spatial field distribution for SRS beams under picosecond laser pumping of oxide crystals. For an improvement of the low spatial coherence of transient and stationary SRS we demonstrate simple experimental amplification technique which is based on collinear synchronous laser pumping [2,3] of Raman and LiF crystals with F <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−</sup> color centers which possess by broad absorption (850 – 1150nm) and amplification (1000 – 1300nm) bands.
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