Abstract
A cw tunable infrared spectrometer based on difference-frequency generation in a nonlinear crystal of AgGaS2 was constructed. An output wave-number range of 1920–2020 cm-1 could be covered by an AlGaAs index-guided single-mode diode laser and a ring dye laser (dye: DCM). With an IR power of ∼15 nW and an emission linewidth of 30 MHz the self-broadening of the doublet of NO in the fundamental band was investigated. The self-broadening coefficient (0.0543±0.0008) cm-1 atm-1 is compared with values for lower J″. The spacing of the doublet was determined to be (5.5±0.1)×10-3 cm-1 which is slightly smaller than that given in the hitran database.
© 1996 Optical Society of America
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