FIELD: quantum electronics. SUBSTANCE: device has two active populations with inducted lens characteristics. They are used optical elements of non-stable resonator. Diaphragm is located between active population and mirror at angle to axis of resonator. Diaphragm is used as output mirror. Elements of resonator are spaced in order to provide non-stable states. Size of diaphragm conforms to specific condition. EFFECT: decreased divergence of beam, increased mean power. 3 dwg
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