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Cleaning Procedures For Optical Elements

- Sep 27, 2017 -

An optical element, any instrument used to form a light path, an optical or optical device, or an optical element, such as a lens, optical fiber, planar mirror, grating, optical isolator, splitter, grating, and so on!

The subtle nature of optical elements requires that special procedures be followed in the processing of optical elements to maximize their performance and longevity. In daily use, Optical Components optical elements are exposed to contaminants such as dust, water and skin grease. These contaminants increase the scattering of the optical surface and the absorption of the incident light, which creates a hot spot on the optical surface, causing permanent damage. The optical elements of the coating are particularly susceptible to such damage.

The content of this guide covers common processing and cleaning procedures applicable to a wide range of optical components. Because of the material, size, Optical Components and refinement of optical elements, it is important to use proper handling and cleaning methods. A suitable method for an optical element may destroy another optical element.


By using appropriate processing techniques, the number of cleaning optical components can be reduced and their service life improved. Please open the optical element in a clean, temperature controlled environment. Do not handle optical elements directly with your hand, because the skin grease will cause permanent damage to the surface of the optical element. Conversely, you can operate with gloves, Optical Components which are more convenient for smaller optical elements, using optical tweezers or vacuum tweezers. Whatever method is used to clamp an optical element, it can only be clamped along a non optical surface, such as the matte edge of an optical element.

Importance: Holographic grating, notch grating, first unprotected metal reflector, and thin film splitter (this is not an exhaustive list) of the optical surface must not be touched by hand or optical operating equipment. These surfaces are particularly sensitive, Optical Components and any physical contact can cause damage.

Warning: Most crystals (such as calcite, splitter, lithium niobate crystals, and electro-optic modulators) are sensitive to temperature and burst when exposed to a thermal shock environment. Therefore, Optical Components make sure that the packaging and items are placed in a temperature-stabilized environment before opening. These crystals are more fragile than ordinary optical elements, so they are more carefully operated when cleaning.


Do not place optical elements on a hard surface because the optical elements or contaminants on their surfaces will grind the optical elements. In contrast, most optical elements should be wrapped in lens paper and stored in a storage box specifically designed for optical elements. Typically, Optical Components these boxes are stored in environments with low humidity, high cleanliness, and controlled temperatures. Optical elements are easily scratched or contaminated, and some optical coating elements are hygroscopic, so proper storage is important for protecting optical elements.


In general, it is necessary to check the optical elements before and after use and before and after cleaning. Because most contaminants and surface defects are smaller in size, Optical Components we often need to use amplification devices when inspecting optical components. In addition to amplifying the equipment, sometimes we need to use a relatively bright light to illuminate the optical surface, to enhance surface pollutants and defects of the specular reflection strength, so that more easily detect contaminants and defects.

When examining the reflective coating surface, the optical elements need to be raised to a height parallel to your line of sight. Optical elements should intersect with sight, not perpendicular to the optical surface, so that contaminants can be seen instead of reflected light. Polished surfaces, such as lenses, Optical Components need to be perpendicular to your line of sight, so that you can check the transparency of the entire optical element.

If there is a surface defect on a clean optical surface, a scratch standard plate can be used to classify the size of the defect, that is, to compare the size of the calibrated defect on the standard plate and the size of the surface defect of the optical element. If the size of the defect on the optical surface exceeds the manufacturer's scratch specification, the optical element needs to be replaced to achieve the desired performance effect.

Cleaning procedures

If possible, be sure to read the manufacturer's recommended cleaning and operating procedures. Because the cleaning of optical elements all involves the operation of optical elements, so under the use of the following cleaning guide, please follow the appropriate operating procedures. If clean or improper operation, the optical element will cause permanent damage.

Before cleaning the optical elements, check the optical elements to determine the type and severity of the contaminants. This inspection step cannot be skipped because the cleaning process of an optical element usually contains solvents and physical contact with the optical surface, which can cause damage to optical elements if handled too frequently.

The cleaning sequence of optical elements adhering to multiple contaminants is important so that the optical surface is not damaged by other contaminants when removing a contaminant. For example, Optical Components if an optical element is contaminated with oil and dust at the same time, wiping the oil first will scratch the optical surface. This is because the dust also rubs along the surface during wiping.

The optical element comprises a smooth and a surface of light, comprising a flat part and a concave chamber in the center of the flat part, the light emitting diode corresponds to the concave chamber installation, the inner surface of the concave chamber is roughened and the concave chamber is stepped, and the concave chamber comprises a small path part, a large diameter part adjacent to the footpath and the flat part, Optical Components and a The shoulder edge between the large diameter parts, the surface of the light and the back of the smooth face are arranged and roughly arc-shaped. The utility model has the effect of forming a rough surface through the inner surface of the concave chamber, and by making appropriate refraction of the light emitting angle of the light-emitting diode by the large diameter part, and reducing the original yellow Halo phenomenon, and improving the optical optical properties, To better use in large-scale thin-form LED TVs.

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