System of precocious detection of smokes for aspiration LaserFocus. Designed, made and certificate according to norm EN54-20. Equipped with a chamber of analysis for bundle of light laser with adjustable sensibility from 0 ' 025 % up to 20 % osc/m with autolearning. It incorporates 1 entry of pipeline of sampling forming a zone of detection. 3 configurable thresholds of alarm (Alert, Prealarma and Fire).