Abstract.
An AlGaAs diode laser was used to detect NO2 absorption lines belonging to the (0 0 0)–(2 13 1) vibrational band, within the X˜2 A 1 electronic ground state, at 739 nm. A simple absorption spectrometer based on wavelength-modulation spectroscopy with second-harmonic detection was developed. The minimum detectable pressure of pure NO2 was 0.1 μbar with 2 m absorption path-length, corresponding to an absorbance of 10-6. High-sensitivity detection of NO2 was also performed in the presence of N2 and air at different total pressures: The effects on the detection limit of our apparatus were accurately investigated. The minimum NO2 concentration at 500 mbar of air was measured to be 2 ppm.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 11 June 1996 / Revised version: 11 October 1996
Rights and permissions
About this article
Cite this article
Gianfrani, L., Gagliardi, G., Pesce, G. et al. High-sensitivity detection of NO2 using a 740 nm semiconductor diode laser. Appl Phys B 64, 487–491 (1997). https://doi.org/10.1007/s003400050204
Issue Date:
DOI: https://doi.org/10.1007/s003400050204