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UP: Umweltphysik

UP 3: Atmosph
äre und Klima II

UP 3.7: Fachvortrag

Montag, 22. März 2004, 18:00–18:15, HS 118

Lidar systems for 4-dimensional observations of atmospheric key parameters in development at University of Hohenheim — •Andreas Behrendt, Anna Petrova, Thorsten Schaberl, Max Shiler, Gerd Wagner, and Volker Wulfmeyer — Institut fuer Physik und Meteorologie, Universitaet Hohenheim

The lidar activities at University of Hohenheim are based on a new Nd:YAG laser which emits a nearly Gaussian-shaped beam (M² < 1.5) of 100 W at 1064 nm with a repetition rate of 250 Hz. Frequency-doubling yields 50 W output power at 532 nm. We employ the 532-nm radiation for pumping a Ti:sapphire ring-resonator which will be used for water vapor measurements with the differential absorption lidar (DIAL) technique. In a second branch a Cr4+:YAG crystal is pumped with the 1064-nm radiation. Its eye-safe output of 1400 to 1500 nm will be used for monitoring aerosols and clouds; in a second step, we will explore the feasibility of water vapor DIAL measurements at  1480 nm. The 532 and 1064 nm radiation is also used for lidar observations and, in the near future, frequency tripling will yield 355-nm radiation for simultaneous measurements of temperature, particle extinction, and particle backscattering with the rotational Raman technique. The high power of this combined transmitter and effective use of the received signals will allow scanning operation. As a result, it will be possible to observe the spatial structure of a highly interesting set of atmospheric key parameters with unprecedented spatial and temporal resolution.