Vol. 16, issue 11, article # 13

Abstract:

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%.