Optical Componets Knowledge

Denifition of Fresnel Lens A Fresnel lens is an optical component used as an alternative to a conventional lens due to it being lighter and more cost-effective. Since the refractive power of a lens is in the optical interfaces – the lens surfaces – in a Fresnel lens the optical material is removed as much as possible while maintaining the surface curvature (Figure 1).  A Fresnel lens is made of several concentric grooves etched into a substrate such as plastic. Due to their characteristics, this type of lens is capable of focusing light similar to a conventional lens while being physically narrow in profile. Slope and draft When compressing the lens surface into a plano surface there is the need for a finite prism pitch, and both a slope angle…

A Fresnel lens is an optical component used as an alternative to a conventional lens due to it being lighter and more cost-effective. Since the refractive power of a lens is in the optical interfaces – the lens surfaces – in a Fresnel lens the optical material is removed as much as possible while maintaining the surface curvature. A Fresnel lens is made of several concentric grooves etched into a substrate such as plastic. Due to their characteristics, this type of lens is capable of focusing light similar to a conventional lens while being physically narrow in profile.Slope and draft When compressing the lens surface into a plano surface there is the need for a finite prism pitch, and both a slope angle and draft component (Figure 3). The slope…

Buyers Guide | How to Choose Your Laser Safety Glasses? Published by The VY Optoelectronics Co.,Ltd. | Laser Safety Glassses on November 23rd. Typically, to determine what type of Laser Safety glasses or goggles to buy, the following is needed: 1) Know your laser’s wavelength. 2) Determine the protection level needed based on your laser’s output parameters, or look for the recommended Optical Density (OD). This can ask your engieer, or please feel free to contact us for a assitance. 3) Select a filter whose specifications match the above information. Laser safety glasses is very necessary for a laser power even 5mw, they are extensively used in the field of laser alignment, laser medical treatment, Laser industry etc. Lasers are more dangerous than most people understand, and your eyes are the most vulnerable to…

The Powell lens resembles a round prism with a curved roof line. The lens is a laser line generator, stretching a narrow laser beam into a uniformly illuminated straight line. The Powell lens is a quantum leap forward in line generator performance over the simple cylinder lens. A cylinder lens produces a poorly illuminated line, one limited by the non-uniform, Gaussian laser beam. The Powell lens’ rounded roof is in fact a complex two-dimensional aspheric curve that generates a tremendous amount of spherical aberration that redistributes the light along the line; decreasing the light in the central area while increasing the light level at the line’s ends. The result is a very uniformly illuminated line used in all manner of machine vision applications; from bio-medical to automobile assembly. Fan Angle…

There are a lot of decisions when it comes to choosing the right dome port for your camera and lenses. Is a glass dome better than acrylic? What’s the proper size to use with a particular lens? These are just a few of the questions we will cover in this article as well as explain what a dome is and advantage of a dome lens. 1. Why use Dome ports for Underwater Photography? •   Domes make it better – Domes help correct aberrations that occur when light travels thru water as opposed to air. Domes can deliver better results compared to flat ports, and also make it easier or possible some results that flat ports would not capture. •   Size matters – Bigger domes are better than smaller domes, for…

The substrate of infrared sensor filter is single crystal silicon, through alternately manufacture thin film of different refractive index and thickness on the substrate, the substrate has functions such as long pass, short pass, band pass, antireflection, and reflection. The single crystal silicon wafers have good infrared spectral characteristics and physical properties. VY has a large inventory of long pass filter with 5.5um silicon wafer, we could provide 50,000 pieces in 5 days after the order is placed, and 100,000 pieces can be shipped in 10 days. The finished products of the following sizes can be provided at any time in 2 days. ● 2.8 * 2.8 * 0.5mm ● 2.9 * 2.9 * 0.5mm ● 3.0 * 3.0 * 0.5mm Silicon (Si) single crystal is a chemically inert material…

An aspheric lens can be designed to minimize aberration by adjusting the conic constant and aspheric coefficients of the curved surface of the lens. The most notable benefit of aspheric lenses is their ability to correct for spherical aberration, an optical effect which causes incident light rays to focus at different points when forming an image, creating a blur. Spherical aberration is commonly seen in spherical lenses, such as plano-convex or double-convex lens shapes, but aspheric lenses focus light to a small point, creating comparatively no blur and improving image quality. Now we’d like to introduce roughly one way to manufacture a aspheric lens. ● Firstly, use aspherical milling equipment to grind the aspherical surface. The circular grinding wheel is installed on the above axis and rotates at high speed.…

The molding of the blank of optical parts plays a significant role in improving the efficiency of optical cold processing, improving the utilization rate of optical glass, saving labor and reducing costs. Since 1970s in foreign countries, the blank technology of optical parts has completely broken through the bondage of classical method, realizing continuous smelting and material drop molding, which has increased the utilization rate of optical glass to over 90%, while the supply of raw material blank accounts for more than 80% of the whole raw material of optical parts. The blank forming of optical parts can be divided into two methods. That is secondary molding method and primary molding method. Secondary molding is also called hot pressing molding method, and primary molding is also called dripping molding. The…

Sapphire glass generally refers to synthetic sapphire, which is very different from the jewels that people usually understand – natural sapphire. It is generally used in the manufacture of watch mirrors. Sapphire is a generic name for corundum gemstones in addition to red rubies in corundum gemstones. The main component is alumina (Al2O3). Sapphire glass is a synthetic sapphire that can easily and inexpensively produce gem-quality sapphire in the laboratory with the same chemical composition and physical properties as natural sapphire. Sapphire glass is similar to the corundum component, the hardness is 9, and various kinds of chemical elements can be added to produce various colors. Nowadays, colorless is commonly used. Its advantages are higher than ordinary glass, and the price is relatively high, mainly used to make the watch…