[1] Uehara K, Tai H. Remote detection of methane with a 1.66μm diode laser[J]. Applied Optics,1992,31(6):809—814.
[2] Ikuta K, Yoshikane N, Vasa N, et al. Differential absorption lidar at 1.67μm for remote sensing of methane leakage[J]. Jpn.J.Appl.Phys,1999,38(1A):110—114.
[5] Reid J, Labrie D. Second-harmonic detection with tunable diode lasers-comparison of experiment and theory[J]. Appl.Phys,1981,26(3):203—210.
[6] Jin W, Xu Y Z, Demokan M S, et al. Investigation of interferometric noise in fiber-optic gas sensors with use of wavelength modulation spectroscopy[J]. Applied Optics,1997,36(28):7239—7246.