FIELD: physics, instrument-making.
SUBSTANCE: invention relates to laser engineering. Lithium niobate-based monocrystalline material with inhomogeneous lithium distribution according to a given law along an active laser element is characterised by the following structural formula: Lia(z)Nbb(z)O3 where: a(z)=p*F(z), where 0.99≤a(z)≤1; b(z)=a(z)/R, where R=Li/Nb, where 0.93≤b(z)≤0.96; F(z)=th(z); p=49.98 at % or 0.9996 pts.at; R=k*x, 0.94≤x≤0.96, z is a spatial coordinate directed along the length of the crystal (cm) in a reference system originating at the input face. The disclosed material has high optical efficiency.
EFFECT: invention increases efficiency of periodically polarised lithium niobate in the infrared spectrum.
2 dwg, 2 tbl
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