Organic laser dyes are fluorescent molecules with large molecular weights, characterized by containing extended systems of conjugated double bonds. In a dye laser, these molecules are dissolved in an organic solvent. They usually have a strong absorption band somewhere from the ultraviolet to the near-infrared. Although dyes have been demonstrated to laser in the solid, liquid, or gas phase, it is in the liquid and solid phases that dyes have made a significant impact as laser media. The spectroscopic techniques UV-Visible absorption, fluorescence, the UV-Visible absorption occurs when an atom or molecule absorbs light and uses the energy of this light to become electronically excited (to raise an electron to a higher energy orbital). <br />Electrons in atoms and molecules can only exist in specific energy levels known as orbitals. The photons that cause these transitions generally have wavelengths in the ultraviolet (UV) or visible range. Once an atom or molecule is electronically excited, it can lose this energy in several ways. <br />Applications of Organic Laser Dye are represented by Industrial, Optical communications, Image processing, 3D data storage, and optical limiting and Medical applications.