FIELD: quantum electronics. SUBSTANCE: laser radiation is generated in central part of volume of active medium located in flat resonator with wide amplification spectrum and amplified to value of intensity ensuring operation of nonlinear mirror manufactured in the form of nonlinear medium and lens which diameter is not less than diameter of active medium positioned behind output mirror. Radiation is focused on to nonlinear mirror and is reflected into solid angle exceeding angle of focusing. Radiation is returned into active medium and amplified during one pass through peripheral part of its volume. EFFECT: enhanced operational efficiency. 2 cl, 2 dwg
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