Optical coatings are thin films deposited on optical components such as lenses, mirrors, and windows to enhance their performance in terms of transmission, reflection, or polarization of light. These coatings are designed to modify the optical properties of the component, such as improving anti-reflection or increasing the efficiency of light transmission. Optical coatings can be used in a wide range of applications, including in imaging systems, laser technology, and displays. Techniques used in optical coating include physical vapor deposition, chemical vapor deposition, and sputtering.