Title :
Tunable continuous wave DFG-based gas sensor using fibre amplified 1.5 μm external cavity diode laser and high power 1 μm diode laser
Author :
Limpert, J. ; Zelimer, H. ; Tünnermann, A. ; Lancaster, D.G. ; Weidner, R. ; Richter, D. ; Tittel, F.K.
Author_Institution :
Inst. of Appl. Phys., Friedrich-Schiller-Univ., Jena, Germany
fDate :
9/28/2000 12:00:00 AM
Abstract :
A novel compact, room-temperature mid-infrared difference frequency generation (DFG)-based trace gas sensor based on direct absorption spectroscopy is reported. Tunable, narrow linewidth difference frequency radiation from 3.3 to 3.5 μm is generated in periodically poled lithium niobate at power levels of >4 μW. The output from an external cavity diode laser, amplified up to 20 dBm by an erbium-doped fibre amplifier is used as the signal source. A 500 mW α-DFB diode laser at 1066 nm serves as the DFG pump source. This sensor has been applied to real time trace gas detection of CH4 and H2CO
Keywords :
air pollution measurement; distributed feedback lasers; fibre optic sensors; gas sensors; infrared detectors; laser cavity resonators; laser tuning; measurement by laser beam; multiwave mixing; optical fibre amplifiers; optical pumping; semiconductor lasers; 1 micron; 1.5 micron; 1066 nm; 3.3 to 3.5 micron; 4 muW; 500 mW; CH4; DFB diode laser pump source; Er-doped fibre amplifier; H2CO; IR sensor; LiNbO3; continuous wave DFG-based gas sensor; direct absorption spectroscopy; fibre amplified external cavity diode laser; high power diode laser; mid-infrared sensor; narrow linewidth difference frequency radiation; periodically poled LiNbO3; real time trace gas detection; room-temperature operation; trace gas sensor; tunable CW DFG-based gas sensor;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20001209
