Optical film inspection


When we talk about optical films, we are not unfamiliar with them, because optical films are everywhere in our lives, making our lives colorful. For example: our mobile phones, computer screens, TV LCD displays, LED lighting, etc., as well as the outer film of glasses, optical devices, optical instruments and applications in optical communications are too numerous to enumerate. Nowadays, the application range of optical films in national defense is gradually expanding, such as lasers and filters in missile satellites; military sensors and warning systems, all of which are coated with optical films.

As an important type of optical components, optical films are not only widely used in modern optics, optoelectronics, optical engineering and other related scientific and technological fields. And it plays an irreplaceable role in the transmission and modulation of light, the division and synthesis of spectrum and energy, and the conversion between light and other energy states. Not only that, optical film is also a function of polarization control, phase control, photoelectric, photothermal, and photoacoustic control elements in optical systems. These functions of optical film are used in laser technology, optoelectronic technology, optical communication technology, optical display technology and optical storage. Technology and other modern optical technologies have been fully applied, which has promoted the development of related technologies and disciplines.

First, the characteristics of optical film

The surface of the optical film is smooth, and the interface between the film layers is geometrically divided; the refractive index of the film layer is on the interface It can undergo a jump, but it is continuous in the film; it can be a transparent medium or an absorbing medium; it can be uniform in the normal direction or non-uniform in the normal direction.

Second, the classification of optical film

Optical film is divided into reflective film, antireflection film, filter film, optical protective film, polarizing film according to application , Spectroscopic film and phase film. The first four are commonly used.

1. Optical reflective film is used to increase specular reflectivity, and is commonly used to manufacture reflective, refractive and resonant cavity devices.

2. The optical anti-reflection coating is deposited on the surface of the optical element to reduce surface reflection and increase the transmission of the optical system, also known as anti-reflection coating.

3. The optical filter film is used for spectrum or other optical segmentation. There are many types and complex structures.

4. The optical protective film is deposited on the surface of metal or other soft and erodible materials or thin films to increase its strength or stability and improve optical properties. The most common is the protective film of the metal mirror.

3. Application of optical film

Optical film can be divided into 'geometric optics and physical optics'. Geometric optics is the geometry formed by the surface of optical devices. Shaped dielectric film layer, so that the light path can be changed to achieve the adjustment or redistribution of the light beam; physical optics is the dielectric film layer formed by nano-processing the unique optical material elements in nature to the surface of the required optical device, through The characteristics of the optical material elements of the dielectric film layer are enhanced to change the light polarization, transmission, reflection and other functions.

Generally, the preparation conditions of optical films require high and precise. The preparation of optical films is divided into dry preparation method, wet preparation method and dry preparation method (including vacuum coating: evaporation coating, magnetron sputtering, ion plating). Etc.) are generally used for the preparation of physical optical films, and wet preparation methods (including coating methods, casting methods, thermoplastic methods, etc.) are generally used for the preparation of geometric optical films.

With the continuous development of science and technology, not only more updated requirements are put forward for optical films, but also a steady stream of technical support is provided. All this has promoted the continuous development of optical films, making optical films Better application in various fields of science and technology. The development of optical films has promoted the continuous development of science and technology on the one hand, and on the other hand has also allowed people's lives to be continuously improved.

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