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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. use
With the continuous increase of highways, urban roads, and parking lots, higher and higher requirements have been put forward for traffic control and safety management. Intelligent traffic management systems have become the mainstream of traffic management development, and license plate recognition technology, as the core of this system, plays a crucial role. Due to the complexity of the license plate itself, with different backgrounds, similar shapes, and unclear damaged fonts, coupled with the fact that the car is moving and mostly photographed outdoors, it has achieved high accuracy
In recent years, IPL, as a type of light source known as intense light, has achieved significant clinical results in the treatment of vascular lesions, pigmentary lesions, scars, acne, hair removal, and photoinduced skin tenderness. Its treatment principle is similar to laser, based on the theory of selective photothermal action, but strong light is not laser. Let's talk about the principle of strong light and how strong light is generated? Intense pulsed light (IPL) is a type of incoherent light that is essentially ordinary light and not
Spherical lenses have a constant curvature from the center to the edge of the lens, while the curvature of non spherical lenses constantly changes from the center to the edge. The curvature of a spherical lens is constant, meaning that the front and rear surfaces of the lens are part of the sphere. Each surface can be convex, concave, or flat. In order to ensure optical performance in photographic lenses, many "aberrations" must be corrected. If only spherical lenses are used for calibration, there will need to be many lens groups that meet the technical requirements of the lenses
Flat field focusing lens, also known as YAG laser field lens, F-theta focusing lens, laser scanning lens, or focusing field lens, is a set of lens optical components, usually consisting of three focusing mirrors and one protective mirror. The protective mirror is coated with anti reflective film on both sides to ensure a transmittance greater than 99%. The main function is to form a uniform focal point on the entire marking plane, which is one of the core accessories of the laser marking machine. Generally speaking, in fiber laser marking machines, when the laser beam is focused and transmitted through
Collimators are designed for point light sources, which are common in our daily lives, such as the light emitted by lighting a match or the light bulb of an old-fashioned flashlight. For laser systems, the collimating mirror we are discussing is essentially the laser generated from the energy transmission fiber. The light from the energy fiber is a point light source with a divergence angle. If we place this light source at the focal point of the fiber optic collimator, we will know that from the focusing mirror (actually using the focusing mirror in reverse)
Optical materials are the objects of various optical component processing and are an important component of optical instruments. Optical materials include optical plastics, optical glass, and optical crystals. The main differences between optical glass and ordinary glass are as follows: optical glass contains most of the elements in the periodic table, but with different compositions and contents. Optical glass has physical and chemical uniformity, high transparency, and specific and precise optical constants. Usually, silica, also known as
The concept of color filter: A filter that operates in the visible light range is called a color filter. It can reflect or transmit colored light within a certain wavelength range, so it will present different colors. Color filters are commonly used in color related and monochromatic applications, such as color printing, projection displays, LCD displays, photography and video recording, color decoration, etc. At present, the widely used color filters are colored glass absorption filters and reflective optical thin film filters
In optical applications and experiments, an important factor in selecting optical components is whether they can withstand the effects of optical radiation, which is particularly important in high-power laser applications. There are three main types of damage to optical components caused by optical radiation: material chemical bond damage directly caused by extremely high peak power; The second is dielectric breakdown caused by short pulse laser radiation; The third is the thermal effect caused by light absorption. The parameter of the optical component's ability to withstand light radiation under short pulse laser is called laser
Application: Optical spectroscopy instruments such as fluorescence microscopes, police multi band light sources, and bio chip readers. Band: from short wave ultraviolet to near-infrared, i.e. 250nm-1000nm range. Filter types: Generally, the following types of spectral types of hard film interference filters are used: bandpass, short wave pass, long wave pass. Band Pass filters (BP). Bandwidth series: 15nm, 20nm, 25nm