Spectroscopic applications of QPM devices

Author

Lancaster, D.G. ; Richter, D. ; Tittel, F.K.

Author_Institution

EWD, Defence Sci. & Technol. Organ., Salisbury, SA, Australia

Volume

1

fYear

2001

fDate

15-19 July 2001

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/CLEOPR.2001.967760

Filename

967760