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A multiple wavelength, pulsed CO(2) lidar system operating at a pulse repetition frequency of 200 Hz and permitting the random selection of CO(2) laser wavelengths for each laser pulse is presented. This system was employed to measure target reflectance and atmospheric transmission by using laser pulse bursts consisting of groups with as many as 16 different wavelengths at a repetition rate of 12 Hz. The wavelength tuning mechanism of the transversely excited atmospheric laser consists of a stationary grating and a flat mirror controlled by a galvanometer. Multiple wavelength, differential absorption lidar (DIAL) measurements reduce the effects of differential target reflectance and molecular absorption interference. Examples of multiwavelength DIAL detection for ammonia and water vapor show the dynamic interaction between these two trace gases. Target reflectance measurements for maple trees in winter and autumn are presented.

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A multiple wavelength, pulsed CO2 lidar system that operates at a pulse repetition frequency (PRF) up to 200 Hz (for a single wavelength) and permits the random selection of CO2 laser wavelengths for each laser pulse is presented. The CO2 laser was developed by Laser Science Incorporated, Cambridge, Massachusetts. The lidar system is employed to measure atmospheric transmission using laser pulse bursts consisting of groups of 10 different wavelengths (the maximum available is 16 wavelengths) at a repetition rate of up to 3 Hz (the maximum available is 12 Hz) and at a PRF of 150 Hz for wavelengths within a burst. The, tuning mechanism for switching wavelengths utilizes a stationary grating and a flat mirror controlled by a galvanometer. The laser is able to transmit up to 100 mJ per pulse.