DRIVING SYSTEM FOR SEMICONDUCTOR LASER

PURPOSE:To detect a material to be detected with precision by branching part of laser light radiated to the space where the material to be detected is present and photodetecting it by a photodetector, and controlling the driving current, etc., to a semiconductor laser in such a way that the light ou...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	DOI SHIYOUJI, TOUFUKU ISAO, ISHIZAKI HIROYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES BASIC ELECTRIC ELEMENTS DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES DEVICES USING STIMULATED EMISSION ELECTRICITY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	PURPOSE:To detect a material to be detected with precision by branching part of laser light radiated to the space where the material to be detected is present and photodetecting it by a photodetector, and controlling the driving current, etc., to a semiconductor laser in such a way that the light output is maximized. CONSTITUTION:A laser L emits light by a driving current supplied from a constant current power source 1, and the light is intermitted by a chopper CH and collimated through the 1st lens LX to be radiated to the space where aerosol is present. The light is condensed through a lens LY and converted photoelectrically by the 1st photodetector D1, and a microcomputer MC calculates the concentration of the aerosol. A part of the light is photodetected by a photodetector D2 through a beam splitter BS, a total reflection mirror M, and a lens LZ and is converted photoelectrically. The resulting signal is inputted to the microcomputer MC to control the driving current and the temperature of the laser L so that optical power radiated from the laser L is maximized.