FIELD: physics.
SUBSTANCE: proposed laser resonator consists of two mirrors arranged along optical axis with two collecting lenses with Јl1 and fl2 focal distances arranged there between. Mirrors are located in focal planes of said lenses. Reflecting surfaces are made up of balls with focal distances of fm1and fm2. Distance L between lenses is selected subject to 
where fm1, fm2 > 0 for concave surfaces and fm1, fm2 < 0 for convex surfaces.
EFFECT: locating beam swinging plane at whatever preset point on resonator axis.
1 dwg
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