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利用近红外可调谐半导体二极管激光用直接吸收光谱技术和波长调制光谱技术初步观测了CO2在1.31 m附近的吸收.从实验结果可以看出,在4.5torr压力下,可探测最小吸收线强度为3.769×10-27μcm-1/(molecule·cm-2),相应的信噪比是16.8.

参考文献

[1] Gao X M, Huang W, Li Z Y, et al. Sensitive detection of CO2 molecule using near-infrared diode laser absorption spectroscopy [J]. Acta Optica Sinica (光学学报), 2003, 23:609 (in Chinese).
[2] Reid J, Garside B K, et al. High sensitivity point monitoring of atmospheric gases employing tunable diode lasers[J]. Appl. Opt., 1978, 17: 1806.
[3] Gustafsson J, Axner O. Theoretical investigation of the temperature dependence of the 2f-wavelength modulated diode-laser absorption signal [J]. Spectrochimica Acta Part B, 1998, 53: 1827.
[4] Liger V V. Optical fringes reduction in ultrasensitive diode laser absorption spectroscopy [J]. Spectrochimica Acta Part A, 1999, 55: 2021.
[5] Gustafsson J, Chekalin N, Axner O. Characterization of 2f-,4f-, and 6f-background signals in wavelength modulation diode laser absorption spectrometry in graphite furnaces [J]. Spectrochimica Acta Part B, 2003, 58: 123.
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