[1] SHU X W,ZHANG Y J,GENG H,et al. Study on phase shift auto-balanced laser absorption spectroscopy[J]. Laser Technology,2011,35(5):618-621(in Chinese).
[2] REID J,LABRIE D. Second-harmonic detection with tunable diode lasers: comparison of experiment and theory[J]. Applied Physics,1981,B26(3):203-210.
[3] TU X H,LIU W Q,WANG T D,et al. Noise analysis of second-harmonic detection with tunable diode laser absorption spectroscopy[J]. Chinese Journal of Quantum Electronics,2006,23(4):22-26(in Chinese).
[4] BJORKLUND G C. Frequency-modulation spectroscopy: a new method for measuring weak absorptions and dispersions[J]. Optics Letters,1980,5(1): 15-17.
[5] DHARAMSI A N. A theory of modulation spectroscopy with applications of higher harmonic detection[J]. Journal of Physics,1996,D29(3):540-549.
[6] WU A,WU Sh Q,CAI Y,et al. Effect of RAM on WMS signal line shape[J]. Laser Technology,2012,36(3): 357-360(in Chinese).
[7] CAI Y,WU Sh Q,WU A,et al. Study on calculation method of detection limit based on wavelength modulation spectroscopy[J]. Laser Technology,2012,36(3):390-393(in Chinese).
[8] WERLE P. A review of recent advances in semiconductor laser based gas monitors[J]. Spectrochimica Acta,1998,A54:197-236.
[9] WU Sh Q,KIMISHIMA T,YOSHII Y,et al. Reduction of fringe noise in wavelength modulation spectroscopy using a one-dimensional focal plane array[J]. Optical Review,2002,9(5): 189-192.
[10] BOMSE D S,STANTON A C,SILVER J A. Frequency modulation and wavelength modulation spectroscopies: comparison of experimental methods using a leadsalt diode laser[J].Applied Optics,1992,20(6):718-731.
[11] SILVER J A. Frequency-modulation spectroscopy for trace species detection: theory and comparison among experimental methods[J]. Applied Optics,1992,31(6):707-717.