A 2D study in focus point of two identical femtosecond laser sources introducing a temporal displacement for ultra-short
pulses generation based on Coherent Beam Combining was developed. This study is based on numerical simulation
which shows the spatial and temporal properties of the electromagnetic field. The piston error is introduced by moving
one of these two laser sources in the same direction, while the other laser source is fixed. The interval considered for the
laser source displacement (piston error) is between lambda/10 and 40 lambda. The results are relevant for the coherent
beam combination at the Extreme Light Infrastructure facility.
The open-path technique is a widely use method for air pollution monitoring, being capable of detecting trace gases
down to ppb concentrations. Using this technique, the DOAS system can measure simultaneously several types of
atmospheric molecular compounds having UV absorption spectra, by averaging on a long optical path (hundreds of
meters).
In this paper, two kinds of comparative measurements by DOAS and in situ detectors (using the point monitoring
technique), in high polluted areas from Bucharest and the surroundings, are presented and analyzed. Only point
monitoring is a standardized technique and therefore by comparing the two methods, several strengths and weaknesses of
the open path technique will be evidentiated. This study is intended to mark out main environmental conditions (e.g.
atmospheric fluctuations, topography) responsible for important differences that appear between experimental data
acquired with the two techniques.
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