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Efficient 1.9 W green diode-pumped cw intracavity doubled Nd:YVO/sub 4/ laser

overtone. Taking advantage of the first azimuthal resonance of the gas cell a detection limit of 100 ppb (S/N = 1) is achieved. These experiments demonstrate the applicability of the photoacoustic diode laser spectrometer as a compact and robust detector for sensitive monitoring of hydrogen fluoride at atmospheric pressure. Moreover the wide tunability of the laser and its narrow linewidth allow for high precision measurements of absorption line parameters. Lineshapes were measured over a broad pressure range of 1-1000 hPa (see Fig. 1). The measured broadening coefficient resulting from collisions with atmospheric molecules and the Doppler linewidth were found to be in good agreement with parameters of literature (see Fig. 2).' Furthermore, to our knowledge the pressure shift of this absorption line was measured for the first time.