The unblended ozone line at 1044.533 cm-1 was acquired by using the frequency modulation technique. A tunable CO2 sideband laser with a GaAs waveguide modulator with a tuning bandwidth of 20 GHz in the mid-infrared region was used for this method. With this technique, a second sideband at 1-MHz frequency with a peak-to-peak amplitude of 1 V was imposed on the first tunable sideband. The signal was passed through a 1-m cell and collected with an EG&G detector. The signal-to-noise ratio obtained was approximately 100:1.
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