Mar 15,
If you are looking for more details, kindly visit our website.
An achromatic lens can be defined as a lens which is made by a combination of two different types of lenses carrying different focal powers in a manner such that the images formed by the light of both the combined lenses are free from chromatic aberration or achromatism.
The most commonly used and the earliest example of an achromatic lens is the achromatic doublet. An achromatic doublet is made from a pair of glasses, of which one is typically a concave and another is convex. The concave element of the doublet is composed of flint glass (with higher dispersion); the convex element, however, is made up of crown glass (with low dispersion). These two elements are placed (cemented) next to each other in such a manner that the chromatic aberration of the one element is balanced by the chromatic aberration of another. There are various types of achromatic lenses, which differ in the type of lens elements and optical properties. Some examples of achromatic lenses include Clark doublet, Dialyte, Steinheil doublet, Littrow doublet and Oil-spaced doublet.
* Anatomy of an Achromatic Lens
An achromatic lens, also referred to as an achromat, typically consists of two optical components cemented together, usually a positive low-index (crown) element and a negative high-index (flint) element. In comparison to a singlet lens, or singlet for short, which only consists of a single piece of glass, the additional design freedom provided by using a doublet design allows for further optimization of performance. Therefore, an achromatic lens will have noticeable advantages over a comparable diameter and focal length singlet.
An achromatic lens comes in a variety of configurations, most notably, positive, negative, triplet, and aspherized. It is important to note that it can be a doublet (two elements) or triplet (three elements); the number of elements is not related to the number of rays for which it corrects. In other words, an achromatic lens designed for visible wavelengths corrects for red and blue, independent of it being a doublet or triplet configuration. Refer to Figures 1- 4 for illustrations of each type.
+ Please check parameter of achmatic lens according to listed table below:
Dia.
Diameter
R
Radius of Curvature
ET
Edge Thickness
EFL
Effective Focal Length
CT
Center Thickness
P
Principle Point
BFL
Back Focal Length
* Brighter Images and Better Energy Throughput
Because on-axis performance of an achromatic lens will not deteriorate with larger clear apertures, "stopping down" the optical system becomes unnecessary. "Stopping down" the aperture refers to reducing its size, for example via a pinhole or iris diaphragm, in order to improve overall performance. With the entire clear aperture utilized, an achromatic lens and achromatic lens systems are faster, more efficient, and more powerful than equivalent systems using singlet lenses.
* Applications of Achromatic Lenses
Achromatic lenses are ideal for a range of applications including fluorescence microscopy, image relay, inspection, and spectroscopy and widely used in a multi-lens optical system that usually consists of several achromatic lenses. Also used in high-quality microscopes and photographic apparatuses are complex lens systems that can eliminate both hyperchromatic and other monochromatic aberrations.
What Makes Achromatic Lenses Important?
Achromatic lenses bring color into focus at the same points that allow users to focus on images. Compared to non-corrected singlet lenses, the achromatic lens produces a much clearer image that makes for easier viewing and more accurate perception.
They brought revolutionary changes to the way you do imaging. Although lenses continue to improve in quality, the achromatic lens remains a staple in scientific and non-scientific optics applications.
* There are some benefits of achromatic lens assemblies
+ Improved Image Quality
By eliminating the color fringes, the achromatic lens significantly increases the image brightness and clarity and this fact is particularly true for polychromatic imaging.
+ Efficient Light Transmission
Unlike the singlet lens, the on-axis presentation of an achromatic lens will not reduce as aperture size increases, allowing you to utilize the entire clear aperture.
+ Cost-effective Production
Although an improvement on the achromatic exists, these lenses are much more expensive. And for the most purposes, the achromatic lens provides many corrections by making it the most cost-effective way to get clear white light images.
Achromatic lenses are designed for infinite conjugate ratios but are ideal for finite conjugate applications when used in pairs. In finite conjugate applications, both the object and image are a finite distance from the lens pair. It is basically used to minimize or eliminate chromatic aberration. You can buy achromatic lenses from the achromatic lenses manufacturer that provides high-quality products.
People also ask
What is an achromatic lens used for?
A lens which is specially designed to control the effects of chromatic distortion or aberration (a defect of optical lenses to bring the focus of all colours to the same convergence point) is called an achromatic lens. It is widely known as an 'achromat'.
What is the difference between achromatic and apochromatic?
Achromatic lenses are corrected to bring two wavelengths into focus in the same plane &#; typically red (~0.590 µm) and blue (~0.495 µm). Apochromatic lenses are designed to bring three colors into focus in the same plane &#; typically red (~0.620 µm), green (~0.530 µm), and blue (~0.465 µm).
What does an achromatic lens consist of?
An achromatic lens, also referred to as an achromat, typically consists of two optical components cemented together, usually a positive low-index (crown) element and a negative high-index (flint) element.
What is the meaning of achromatic?
Achromatic means literally "without color". It can also refer to: Achromatic colors,"greys" or "neutral colors", also black or white. Achromatic lens, a lens designed to minimize chromatic aberration.
If you are looking for more details, kindly visit Hongsheng.
How does an achromatic lens work?
An achromatic lens is a combination of concave and convex pieces of glass that focuses the different colour wavelengths in light to a single plane. Each type of glass disperses the colours differently &#; put together they counterbalance each other and produce a sharp image.
How do you make an achromatic lens?
An achromatic doublet is typically made of a positive crown glass lens whose power is positive but which decreases with increasing wavelength (i.e. toward the red), cemented to a weaker flint glass lens whose power is negative and also decreases (in magnitude) with increasing wavelength.
VY Optoelectronics Co.,Ltd. is a professional manufacturer of optical lenses, our factory located in Changchun City of China, nearly 50 K pieces of achromatic lenses are produced every month in our plant, we have large stock of lenses. Besides, we are able to provide a full range of inspection reports and CoC( Certificate of Conformance) for full optical characterization such as surface quality, dimensions, centricity, coating transmittance and reflectance, and overall or partial surface accuracy. Material of optical doublet we process can be optical glass, UV fused silica (JGS1), infrared fused silica (JGS3) and calcium fluoride (CaF2), barium fluoride (BaF2) and other crystalline material etc.
Factory Standard
Shape: Singlet, Doublets or Triplets
Diameter Tolerance: ± 0.03mm
Thickness Tolerance: ± 0.03mm
Radius: ± 0.3%
Focal Length Tolerance: ± 0.5%
Surface Quality: 20-10 Scratch-Dig&#;After Coating&#;
Surface Flatness: λ/5 @633 nm
Centration: < 3 arc minutes
Clear Aperture: > 90% of central dimension
A short video to shown achromatic lenses we facbricate for your better understanding.
Contact us for manufacturing limit or custom specifications.
Ordinary achromatic lens refers to a lens group that corrects the chromatic aberration of three wavelengths (blue light, green light, and red light).
Because the converging lens focuses blue light closer to the focal point, and the concave lens has a higher dispersion rate for blue light, the positive and negative two-lens chromatic aberration can make the red and blue two colors overlap into one, basically eliminating chromatic aberration. The crescent-shaped surface can limit spherical aberration and coma. However, astigmatism and distortion still exist. Achromatic lenses were commonly used for photographing landscapes, hence the name Landscape Lens.
The shape is crescent-shaped (concave-convex), and it is made by bonding two lenses with different refractive index and dispersion rate together. It was first made by bonding a flat concave lens with a double convex lens in ; later improved in (crescent-shaped). Subsequently, multilayer bonded achromatic lenses appeared.
Convex lenses are made of crown glass with a lower refractive index and a higher dispersion capability. Concave lenses are made of flint glass with a higher refractive index and a lower dispersion capability. Achromatic lenses can generally only make the image points of the two main color lights coincide, thereby eliminating chromatic aberration of these two color lights. For example, considering the eye is used directly to observe for ophthalmic instruments, C-line (656.3 nm wavelength red light) and F-line (486.1 nm wavelength blue light) chromatic aberrations can be eliminated; for camera lenses, from a photochemical point of view, D-line (589.3 nm wavelength yellow light) and G-line (430.8 nm wavelength purple light) chromatic aberrations can be eliminated. Although residual chromatic aberration still exists for other colors of light, the effects are insignificant for general applications, and can essentially be considered as eliminating chromatic aberration.
The two-piece achromatic lens is the simplest structure in the achromatic lens, and it is divided into two types: double bonded and double separated. Of course, achromatic lenses can also be composed of multi-piece lenses, depending on their usage needs. Achromatic lenses with larger apertures are usually separated and assembled in the frame, with excellent comprehensive performance. For double-separated lenses, the gap between the two lenses is actually equivalent to a third lens. Compared with bonded lenses, it can better eliminate chromatic aberration. Therefore, it can balance image aberrations in a relatively wide wavelength range and play a role in wideband imaging fields.
Achromatic lenses can not only eliminate chromatic aberration but also eliminate spherical aberration by appropriately changing the curvature radius of each surface. If the two glasses that make up the double-concave lens can be selected arbitrarily, it can also eliminate coma. There are also achromatic lenses that correct the chromatic aberration of three or four color lights, in which case the residual chromatic aberration is smaller. However, due to design and manufacturing difficulties, such achromatic lenses are only used in some special occasions. A multiple-lens optical system often consists of multiple achromatic lenses. High-quality microscope objectives, camera lenses, and other complex lens combination systems can eliminate chromatic aberration and various monochromatic image aberrations. Simple box cameras and children's cameras often have achromatic lenses installed.
Want more information on achromatic cemented lens? Feel free to contact us.