Abstract

A cw tunable spectrometer based on the difference frequency generation (DFG) using the nonlinear crystal AgGaS₂ (1 = 40 mm, non-critical type 1 phase matching) and two diode lasers was constructed. With this system we are able to cover the wavenumber region around 2050 - 2150 cm^-1. In this region molecular gases like CO, N₂O and NO have pronounced absorption lines excluding interferencies from other atmospheric gases. With diode lasers as pump source (690 and 810 nm) we arc able to detect this trace gases as well as to measure line broadening coefficients and spacing of several NO-doublets

© 1996 IEEE