Abstract
Nitric oxide, NO, is a biomedically and environmentally important trace gas.1 Therefore, considerable work has been done to investigate the spectrum of this molecule and develop methods to measure trace concentration of this species. Detection of nitric oxide using tunable diode laser spectroscopy (TDLAS) has been reported by Schmitke et al.2 A sensitivity of 300 ppt was obtained, which demonstrated the potential of high-resolution infrared spectroscopy for NO detection. However, at present time, the absence of compact and room-temperature tunable infrared sources at NO absorption region (5.1 to 5.7 μm) greatly limits the use of laser spectroscopy for potential applications.
© 1998 Optical Society of America
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