Vol. 16, issue 11, article # 13

pdf Ponomarev Yu. N., Tyryshkin I. S. Improvement of sensitivity and signal-to-noise ratio in a laser spectrophotometer with a 30-m long absorption cell . // Atmospheric and oceanic optics. 2003. V. 16. No. 11. P. 933-936.
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An enhanced laser spectrometer with a 30-m long absorption cell and an alexandrite narrow-band tunable pulsed laser is described. The performance characteristics of modified alignment units for mirrors of a multipass optical system and a system for measurement of the amplitude ratio of pulsed signals from a photodetector are presented. As a result, the optical path length was extended from 1800 m to 2400 m and the experimental uncertainty in the transmission spectrum was reduced from 1% to 0.2%.