The LIDAR equation contains four unknown variables in a two-component atmosphere where the effects
caused by both molecules and aerosols have to be considered. The inversion of LIDAR returns to retrieve aerosol
extinction profiles, thus, calls for some functional relationship to be assumed between these two. The Klett's method,
assumes a functional relationship between the extinction and backscatter. In this paper, we apply a different technique,
called the optical depth solution, where we made use of the total optical depth or transmittance of the atmosphere along
the LIDAR-measurement range. This method provides a stable solution to the LIDAR equation. In this study, we apply
this technique to the data obtained using a micro pulse LIDAR (MPL, model 1000, Science and Engineering Services
Inc) to retrieve the vertical distribution of aerosol extinction coefficient. The LIDAR is equipped with Nd-YLF laser at
an operating wavelength of 523.5 nm and the data were collected over Bangalore. The LIDAR data are analyzed to get to
weighted extinction coefficient profiles or the weighted sum of aerosol and molecular extinction coefficient profiles.
Simultaneous measurements of aerosol column optical depth (at 500 nm) using a Microtops sun photometer were used in
the retrievals. The molecular extinction coefficient is determined assuming standard atmospheric conditions. The aerosol
extinction coefficient profiles are determined by subtracting the molecular part from the weighted extinction coefficient
profiles. The details of the method and the results obtained are presented.