FIELD: medical engineering. SUBSTANCE: device forms a light beam issued from optic fiber end face surface, loads lens system having two microlenses deflecting optic fiber dispersed light beam marginal rays as a result of spheric aberration in the way that uniform output light beam is produced having clear cut boundary. EFFECT: enhanced accuracy in concentrating light beam power in given region, reduced risk of traumatic injuries in the neighboring tissue. 6 cl, 8 dwg
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