Light Detection and Ranging (LIDAR) has played a significant role in various measurement techniques utilised to monitor and characterise the constituents of Earth's Atmosphere (Measure, 1992). However, the detectable particles are limited by the type of scattering processes on which the LIDAR is based (Videen, 2007a). Thus, developing multiple detection techniques in a single LIDAR system can extract more information about the constituents and condition of the Earth's atmosphere.

European Space Agency Mobile Raman Aerosol Lidar (EMORAL) is an example of such a Raman-Mie-based multi-wavelength system, which is a powerful instrument that can extract various information related to atmospheric aerosols. However, it is still not selective nor sensitive enough to provide detailed information on biological matter. Weak signals originate from particles that weakly interact with emitted lights or aerosol hidden inside the clouds.
Thus, adding a fluorescence channel in the current EMORAL configuration could be the solution to resolve these limitations. Potentially, with a synergy scheme between data obtained by Raman-Mie and fluorescence channels, it is also possible to study the interaction between clouds and aerosol.

Three EMORAL lidar configuration options are proposed in this thesis, targeting different fluorescence emission spectra, excited by a 355 nm UV laser pulse. Among the three proposed concepts, the configuration with two additional fluorescence channels to cover broader fluorescence spectra of 420 – 510 nm and 540 – 600 nm, has a drawback of requiring much more complex modification, more additional components, and higher upgrade cost. On the other hand, the configuration with one additional fluorescence channel, by replacing the current long-pass dichroic beam splitter offers broadband fluorescence at 420 - 510 nm only but with a cheaper and much simpler configuration.

This M.Sc. Thesis was carried out as part of the action "Technical assistance for Polish Radar and Lidar Mobile Observation System (POLIMOS)" financed by the European Space Agency (ESA-ESTEC) Contract No. 4000119961/16/NL/FF/mg.