FIELD: electricity.
SUBSTANCE: active element includes active medium with low- and high reflective coatings applied at opposite sides, which is connected through buffer layer to heat-removing base. High reflective coating includes pattern of multilayer dielectric and metal coatings providing reflection index not less than 99% for wave length of 930 - 1040 nm at laser tilt angle from 0° up to 30°.
EFFECT: improvement of laser radiation output by reduction of thermal resistance between active medium and heat-removing base.
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