Differential absorption measurement of methane with two spatially resolved laser lines
- 20 May 1994
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 33 (15) , 3261-3264
- https://doi.org/10.1364/ao.33.003261
Abstract
Simultaneous and independent lasing on two different atomic lines is achieved with spatial resolution of laser eigenstates in conjunction with intracavity frequency selection. A sensitivity of 0.3 part in 106 meter in the differential detection of methane in 1 atm of air is experimentally demonstrated with this novel dual-wavelength laser. Monitoring the output intensities of the two orthogonally polarized eigenstates permits absolute measurement of methane concentration.Keywords
This publication has 8 references indexed in Scilit:
- Heterodyne spectroscopy with spatially resolved laser eigenstatesOptics Letters, 1993
- Primary production control of methane emission from wetlandsNature, 1993
- Laser eigenstates in the framework of a spatially generalized Jones matrix formalismJournal of the Optical Society of America B, 1991
- Remote sensing of methane gas by differential absorption measurement using a wavelength tunable DFB LDIEEE Photonics Technology Letters, 1991
- Atmospheric methane measurement instrument using a Zeeman-split He–Ne laserApplied Optics, 1989
- He–Ne and cw CO_2 laser long-path systems for gas detectionApplied Optics, 1986
- Alternate intensity modulation of a dual-wavelength He?Ne laser for differential absorption measurementsApplied Physics B Laser and Optics, 1985
- Gas-Laser Frequency Selection by Molecular AbsorptionApplied Optics, 1965