[1] [1] Werle P. A review of recent advances in semiconductor laser based gas monitors[J]. Spectrochimica Acta. Part A: Molecular and Biomolecular Spectroscopy, 1998, 54(2): 197-236.

[2] [2] Arndt R. Analytical line shapes for Lorentzian signals broadened by modulation[J]. J. Appl. Phys.,1965, 36: 2522-2524.

[3] [3] Reid J, Labrie D. Second-harmonic detection with tunable diode lasers-comparison of experiment and theory[J]. Appl. Phys. B, 1981, 26: 203-210.

[4] [4] Silver J A. Frequency-modulation spectroscopy for trace species detection: theory and comparison among experimental methods[J]. Appl. Opt.,1992, 31: 707-717.

[5] [5] Olsen M L, Grieble D L, Griffiths P R. Second derivable tunable diode laser spectrometry for line profile determination[J]. Appl. Spectrosc., 1980,34: 50-56.

[6] [6] Silver J A, Stanton A C. Optical interference fringe reduction in laser absorption experiments[J]. Appl. Opt., 1998, 27: 1914-1916.