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The 3rd International Symposium on Monitoring of Gaseous Pollutants
by Tunable Diode th Lasers, held at the Fraunhofer Institute in
Freiburg on October 17th and 18 , continued a tradition,
established by the two preceeding meetings held at the same
location, in 1986 and 1988. The steadily increasing number of
participants and contributions emphasizes the need for such a
meeting, which is unique in Europe and appreciated abroad. This
third symposium in particular, was specially marked by the presence
of the former Eastern Block Countries, with a number of scientists,
and contributions, from the USSR (stilI existing at the time of the
meeting) and from East Berlin. The large number of contributions
proposed, originally, as oral presentations, could not be fitted in
the schedule of the two-day limit which the participants to the
previous meetings had recommended. To take account of these
contributions, poster sessions were held, combined with extended
discussion time. This intensified personal interaction was much
appreciated by the participants.
Divided into four sections, this work presents the proceedings of
an international symposium on monitoring of gaseous pollutants by
tunable diode lasers. Focusing on atmospheric trace gas detection,
the presentations demonstrate the impressive capabilities of the
diode laser technique. Reports on IV-VI mid-infrared diode lasers
stress those properties - radiation noise and emission linewidth -
which are essential for application to ultra-high sensitivity
pollution monitoring. Two reports on III-V systems emitting at
wavelengths shorter than 3 mu-m show that the less severe cooling
requirements can lead to more compact equipment which can be used
to detect pollutants via overtone absorption bands. The
presentations on IV-VI physics and devices stress the physical and
technological aspects of mid-infrared diode lasers. Laterally
structured diode lasers are discussed in detail. There is also
extensive material which compares traditional AM and the more
recent FM techniques. The reports on special applications point to
new directions for research, thus rounding off an expert discussion
of a vital research area.
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