The cmwpt to use a slab as active elemcne, working in zigzag geometry, mrd also as Fresnel rhomb, seems to be rather attmctive. However, in this case different depolarization effects in active element are of crucial importance. We have carried out the eadnrationa of depolarization effects arising both due to mechardcaI loadhg of an active element at its t%tening mrd due to therrrmoptical distortions. To check up these rigid requirements to depolarization (O.1 Y.-0.01 Yo) careful meammments of depcdsriration effects rord their sources are being carried nut. Mechanical loading gives one of the main contributiomv in depolarimtion at fastening of active element. Using model expaiments with glass Fmanel rhomb rmder m.dmrical loading we have meaaurcd depolarization effects. It is proprml to w addltiorral glass plate to mmpenaate beam depolarization in zigzag slab. The received rcsrdta SNOW to expect successful usc of the slab ampliier as a Fresnel rhomb providing rather high quafity of optical material of active element.
Zig-Zag-Slab-Amplifier had active element 4.5x40x43cm3 in dimensions, six-bounce geometry of beampass, pump cavity with transverse lamp orientation, and diffuse reflectors. Tests showed: the gain is equal to 8 per single pass at 77 kJ of pumping; its non-uniformity over about half of amplifier aperture is less than +1-2.5%; the depolarization distortion over operating area is less than 0.5%.
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