Introduction to anti reflection and anti lens optical coating
In optical components, light energy is lost due to reflection on the surface of the component. In order to reduce the reflection loss on the surface of the component, a transparent dielectric film is usually coated on the surface of the optical component. This type of film is called an anti reflective film. From the perspective of energy conservation, it enhances the transmittance of optical components. Based on the Fresnel formula and the law of refraction, the transmission principle of the anti reflective film was quantitatively explained; The principle of improving the transmission rate of anti reflective films was explained using the electromagnetic transmission theory of electrodynamics.
Anti reflective film for glass and plastic substrates
In many optical systems, a very important part is to apply a coating on the lens that can reduce reflection. In many application fields, anti reflective films are essential, otherwise they cannot meet the application requirements.
In a 35mm automatic zoom camera consisting of 18 lenses, assuming that the interface reflectivity between each glass and air is 4%, the transmittance of the non enhanced lens is 27%, the transmittance of one film is 66% (residual reflectivity is 1.3%), and the transmittance of multiple films (residual reflectivity is 0.5%) is 85%.
Is there anything to pay attention to when processing lenses?
When light enters different transmission materials (such as from air to glass), the reflectivity is about 5%. There are many lenses and refractive bodies in the optical line of sight, which can cause incident light loss of up to 30% to 40%. Modern optical lenses are typically coated with one or more layers of magnesium fluoride anti reflective film, which can reduce reflection to 1.5%, and multiple layers of anti reflective film can reduce reflection to 0.25%. Therefore, if the coating is appropriate, the transmittance of the entire line of sight can reach 95%. Lenses coated with multiple layers of anti reflective film are light green or dark purple, while lenses coated with a single layer of anti reflective film are usually blue purple or red.
The essence of improving transmission intensity is due to different boundary conditions, where the energy distribution of light waves as electromagnetic waves changes at different media interfaces. Usually, optical lenses are used in air. For optical glass with a refractive index of about 1.5, in order to achieve 100% anti reflection effect, the thickness of the anti reflection film can be made to n 1=1.23 or close to 1.23, and the thickness of the anti reflection film can be made equal to one fourth of the (2k+1) wavelength. A single-layer film only increases the transmission of electromagnetic waves at a certain wavelength. In order to achieve the transmission of electromagnetic waves over a wider range and more wavelengths, people use multi-layer coatings to achieve the transmission of electromagnetic waves.
People have rich experience in using anti reflective coatings and have discovered many materials that can be used as anti reflective coatings. At the same time, they have mastered many advanced painting techniques. Therefore, the application of anti reflective coatings involves multiple industries such as medicine, military, and aerospace exploration, making significant contributions to the progress of human science and technology.
Ruicheng is one of the top ten well-known filter brands and ranks among the top filter manufacturers. The company produces various models and specifications of anti reflective lenses and supports shape customization.
Anti reflective film for glass and plastic substrates
In many optical systems, a very important part is to apply a coating on the lens that can reduce reflection. In many application fields, anti reflective films are essential, otherwise they cannot meet the application requirements.
In a 35mm automatic zoom camera consisting of 18 lenses, assuming that the interface reflectivity between each glass and air is 4%, the transmittance of the non enhanced lens is 27%, the transmittance of one film is 66% (residual reflectivity is 1.3%), and the transmittance of multiple films (residual reflectivity is 0.5%) is 85%.
Is there anything to pay attention to when processing lenses?
When light enters different transmission materials (such as from air to glass), the reflectivity is about 5%. There are many lenses and refractive bodies in the optical line of sight, which can cause incident light loss of up to 30% to 40%. Modern optical lenses are typically coated with one or more layers of magnesium fluoride anti reflective film, which can reduce reflection to 1.5%, and multiple layers of anti reflective film can reduce reflection to 0.25%. Therefore, if the coating is appropriate, the transmittance of the entire line of sight can reach 95%. Lenses coated with multiple layers of anti reflective film are light green or dark purple, while lenses coated with a single layer of anti reflective film are usually blue purple or red.
The essence of improving transmission intensity is due to different boundary conditions, where the energy distribution of light waves as electromagnetic waves changes at different media interfaces. Usually, optical lenses are used in air. For optical glass with a refractive index of about 1.5, in order to achieve 100% anti reflection effect, the thickness of the anti reflection film can be made to n 1=1.23 or close to 1.23, and the thickness of the anti reflection film can be made equal to one fourth of the (2k+1) wavelength. A single-layer film only increases the transmission of electromagnetic waves at a certain wavelength. In order to achieve the transmission of electromagnetic waves over a wider range and more wavelengths, people use multi-layer coatings to achieve the transmission of electromagnetic waves.
People have rich experience in using anti reflective coatings and have discovered many materials that can be used as anti reflective coatings. At the same time, they have mastered many advanced painting techniques. Therefore, the application of anti reflective coatings involves multiple industries such as medicine, military, and aerospace exploration, making significant contributions to the progress of human science and technology.
Ruicheng is one of the top ten well-known filter brands and ranks among the top filter manufacturers. The company produces various models and specifications of anti reflective lenses and supports shape customization.