Most surfaces are considered to be optically rough when the heights or depths of their features are compared to the wavelength of the light used. When a laser light (highly coherent) is allowed to be incident on such a rough surface, the scattered coherent wavelets will mutually interfere constructively and destructively to form a random distribution of bright and dark spots called “Laser Speckles”. The optical system used in speckle photography technique will be presented in this project with the different applications of laser speckles in several fields. The speckle displacement will be generated by the light deflection within the polluted air as our phase object under investigation. The relation between speckle displacement and the integrated deflection angle along the optical path length in the polluted area will be measured by analysing the interference fringes obtained within the experimental work of the project. Also the optical tomographic imaging using laser speckles photography technique will be used. Tomography refers to the cross – sectional imaging of an object from either transmission or deflection data collected by illuminating the object from many different directions. Reconstructions are often done using a procedure known as back projection. Here a filtered projection is smeared back over the reconstruction plane along lines of constant slope. The three-dimensional refractive index profile and the density distribution for different cross sections of the phase objects under test have been presented by using the Fourier slice theorem. This theorem relates the Fourier transform of a projection to the Fourier transform of the object along a single radial. Thus given the Fourier transform of a projection at enough angles the projections can be assembled into a complete estimate of the object inner distribution. In this project the experimental verifications of the presented techniques were discussed and the final conclusion will be presented .The experimental results obtained for the three-dimensional refractive index profile and the density distribution of polluted air along different cross sections will be presented and compared with that for pure air. A comparison between the results obtained in the two- dimension analysis technique and the three-dimensional technique will be presented. To explore the optical properties of materials, for example gases and liquids, one should search for a non-destructive method. This method (technique) should be handy, easy, and of course non-costly. Interferometric material analysis using laser techniques is one such method. It has become extremely useful in many fields because of its high coherence, brightness, high power, and monochromaticity. This leads to a non-destructive form of analysis, with the capability of analysing very minute specimens, achieving a fingerprint of multi-element compositions, and measuring temperature and refractive index variations with a very high level of accuracy. Many laser techniques, such as holography, holographic interferometry, speckle-techniques, and fluorescence yield are used extensively in various fields.