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The Cherenkov Telescope Array (CTA) is the next generation of ImagingAtmospheric Cherenkov Telescopes. It will reach a sensitivity and an energyresolution with no precendent in very high energy gamma-ray astronomy. In orderto achieve this goal, the systematic uncertainties derived from the atmosphericconditions shall be reduced to the minimum. Different instruments may helpaccount for these uncertainties. The Barcelona IFAE/UAB (acronyms for Institutde F\'isica d'Altes Energies and Universitat Aut\`onoma de Barcelona,respectively) and the Montpellier LUPM (Laboratoire Univers et Particules deMontpellier) groups are building Raman LIDARs, devices which can reduce thesystematic uncertainties in the reconstruction of the gamma-ray energies from20$%$ down to 5$%$. The Raman LIDARs subject of this work have coaxial 1.8 mmirrors with a Nd-YAG laser each. A liquid light-guide collects the light atthe focal plane and transports it to the readout system. We are developping amonochromator with the purpose of testing the readout chain of both LIDARs.This device is composed of a system of filters and a photomultiplier, and willbe used to study a particular elastic channel. After characterizing the system,we will build a polychromator to collect also the sparse Raman signal and willoptimize it to reduce every possible loss of signal. We report on the currentstatus of the LIDARs development and also the latest results on the differentcharacterization tests.

The IFAE/UAB and LUPM Raman LIDARs for Cherenkov Telescope Array Observatory