A spectroscopy device comprises a laser diode/lens assembly driven by a periodic stepped laser diode drive current. Each period of the stepped laser diode drive current has a plurality of constant current intervals: a left baseline interval, a left skirt interval, a peak interval, a right skirt interval,...http://www.google.fr/patents/US5448071?utm_source=gb-gplus-shareBrevet US5448071 - Gas spectroscopy
