Title :
Spectroscopic applications of QPM devices
Author :
Lancaster, D.G. ; Richter, D. ; Tittel, F.K.
Author_Institution :
EWD, Defence Sci. & Technol. Organ., Salisbury, SA, Australia
Abstract :
The development and application of a range of absorption spectrometers, which operate in the 3.2 - 4.6 /spl mu/m spectral region, are presented. The sensors are based on difference frequency mixing two cw diode lasers in periodically poled LiNbO/sub 3/ to generate narrow linewidth light (<60 MHz). Ruggedness and increased power is achieved by the use of fiber optics for beam delivery and inline fiber amplifiers. Species detected in air include H/sub 2/CO, CO, CO/sub 2/, CH/sub 4/, H/sub 2/O, HCl with sensitivities down to the parts-per-billion level with direct absorption detection or <100 ppt using 2-f modulation spectroscopy.
Keywords :
air pollution measurement; gas sensors; infrared spectrometers; modulation spectroscopy; optical frequency conversion; optical phase matching; spectrochemical analysis; 2-f modulation spectroscopy; 3.2 - 4.6 /spl mu/m spectral region; 3.2 to 4.6 micron; CO; CO/sub 2/; H/sub 2/CO; H/sub 2/O; HCl; LiNbO/sub 3/; QPM devices; absorption spectrometers; air monitoring applications; beam delivery; cw diode lasers; difference frequency mixing; fiber optics; formaldehyde; gas sensors; inline fiber amplifiers; methane; narrow linewidth light generation; periodically poled LiNbO/sub 3/; pollutant gases; trace gases; Absorption; Diode lasers; Frequency; Gas detectors; Laser beams; Optical beams; Optical fiber amplifiers; Optical fiber sensors; Optical fibers; Spectroscopy;
Conference_Titel :
Lasers and Electro-Optics, 2001. CLEO/Pacific Rim 2001. The 4th Pacific Rim Conference on
Conference_Location :
Chiba, Japan
Print_ISBN :
0-7803-6738-3
DOI :
10.1109/CLEOPR.2001.967760
