Conference Proceeding

Development of a broadly tunable mid-infrared laser source for highly sensitive multiple trace gas detection

Key Lab. of Environ. Opt. & Technol., Chinese Acad. of Sci., Hefei, China
12/2008; DOI:10.1109/APOS.2008.5226298 pp.1 - 5 In proceeding of: Optical Fiber Sensors Conference, 2008. APOS '08. 1st Asia-Pacific
Source: IEEE Xplore

ABSTRACT A room-temperature broadly tunable mid-infrared difference frequency laser source for highly sensitive trace gas detection has been developed recently in our laboratory. The mid-infrared laser system is based on quasi-phase-matched (QPM) difference frequency generation (DFG) in a multi-grating, temperature-controlled periodically poled LiNbO3 (PPLN) crystal and employs two near-infrared diode lasers as pump sources. The mid-infrared coherent radiation generated was tunable from 3.2 to 3.7 mum with an output power of about 100 muW. By changing one of the pump laser head with another wavelength range we can readily obtain other needed mid-infrared wavelength range cover. Performance of the mid-infrared laser system and its application to highly sensitive spectroscopic detection of CH4, HCI, CH2O and NO2 has been carried out. A multi-reflection White cell was used in the experiment gaining ppb-level sensitivity. The DFG laser system has the features of compact, room-temperature operation, narrow line-width and broadly continuous tunable range for potential applications in industry and environmental monitoring.

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Keywords

compact
 
continuous tunable range
 
DFG laser system
 
mid-infrared coherent radiation
 
mid-infrared laser system
 
multi-grating
 
multi-reflection White cell
 
narrow line-width
 
near-infrared diode lasers
 
needed mid-infrared wavelength range
 
output power
 
potential applications
 
ppb-level sensitivity
 
quasi-phase-matched
 
room-temperature operation
 
sensitive spectroscopic detection
 
sensitive trace gas detection
 
temperature-controlled periodically poled LiNbO3