FIELD: optical engineering. SUBSTANCE: installation has coherent radiation source, as well as collimator and assembly which forms interfering wave fronts positioned in succession in direction of radiation. The above-indicated assembly includes flat mirror, holographic bifocal lens and second flat mirror arranged in succession in direction of radiation. First mirror is mounted for movement along collimator optical axis. Holographic bifocal lens is recorder with flat fundamental beam, and it has imaginary and actual focuses. Second mirror is installed in direction of radiation passing through actual focus of bifocal lens. EFFECT: more effective construction. 1 dwg
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