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We report a novel optoacoustic detection scheme which is suited for use with low-power radiation sources. The improved detection capability is demonstrated for SO2 with a frequency-doubled dye laser of 1 mW uv output power, allowing the detection of SO2 concentrations as low as 0.12 ppb.

Tropospheric temperature profiles have been measured at daytime with a rotational Raman lidar. The lidar operates in the solar-blind spectral region with KrF laser radiation that is Raman shifted in hydrogen to 276.787 nm. This wavelength corresponds to the resonance absorption of a thallium atomic-vapor f ilter that is used to suppress the large elastic-backscatter signal. The rotational Raman signal is analyzed with an echelle grating spectrometer that separates spectral regions with different temperature sensitivities in both the Stokes and the anti-Stokes Raman spectra. Simultaneously, profiles of water vapor and ozone can be determined by means of vibrational Raman backscattering.