[1] Werle P, Slemr F, Maurer K, et al. Near and mid-infrared laser optical sensors for gas analysis [J]. Opt. Lasers Eng., 2002, 37(2): 101-114. 
[2] Werle P. A review of recent advances in semiconductor laser based gas monitors [J]. Spectrochim. Acta, 1998, 54(2): 197-236. 
[3] Liu J T C, Jeffries J B, Hanson R K. Large-modulation-depth 2f spectroscopy with diode lasers for rapid temperature and species measurements in gases with blended and broadened spectra [J]. Appl. Opt., 2004, 43(35): 6500-6509. 
[4] Arndt R. Analytical line shapes for Lorentzian signals broadened by modulation [J]. J. Appl. Phys., 1965, 36(8): 2522-2524. 
[5] Reid J, Labrie D. Second-harmonic detection with tunable diode lasers – comparison of experiment and theory [J] .Appl. Phys. B, 1981, 26(3): 203-210. 
[6] Axner O, Kluczynski P, Lindberg A M. A general non-complex analytical expression for the nth Fourier component of a wavelength-modulated Lorentzian lineshape function [J]. .Quant. Spectrosc. Ra., 2001, 68(3): 299-317. 
[7] Rothman L S, Rinsland C P, Goldman A, et al. The HITRAN molecular spectroscopic database and HAWKS (HITRAN atmospheric workstation: 1996 edition) [J]. J. Quant. Spectrosc. Ra., 1998, 60(5): 665-710.