Cylindrical Lenses – aspheric, astigmatism

Using our advertising package , you can display your logo, further below your product description, and these will been seen by many photonics professionals.

For more information, please visit our website.

You are a not yet listed supplier? Get your entry!

Find more supplier details at the end of this encyclopedia article , or go to our

are found in the RP Photonics Buyer's Guide. Among them:

Author: the photonics expert Dr. Rüdiger Paschotta

Cylindrical lenses (also called cylinder lenses) are optical lenses which are curved only in one direction. Therefore, they focus or defocus light only in one direction, for example in the horizontal direction but not in the vertical direction. As for ordinary lenses, their focusing or defocusing behavior can be characterized with a focal length or its inverse, the dioptric power.

Usually, the surface curvature of a cylindrical lens is of spherical type, but there are also aspheric cylindrical lenses. Further, there are cylindrical gradient-index lenses, not exhibiting any surface curvature.

Applications

Cylindrical lenses can be used to obtain a beam focus of elliptical form. That can be required, for example, for feeding light through the entrance slit of a monochromator or into an acousto-optic deflector, or for conditioning pump light for a slab laser.

There are fast axis collimators for diode bars, which are essentially cylindrical lenses &#; often with an aspheric shape.

Cylindrical lenses cause astigmatism of a laser beam: a mismatch of focus position for both directions. Conversely, they can also used for compensating astigmatism of a beam or an optical system. For example, they may be required for collimating the output of a laser diode such that one obtains a circular non-astigmatic beam.

More to Learn

Encyclopedia articles:

Questions and Comments from Users

Here you can submit questions and comments. As far as they get accepted by the author, they will appear above this paragraph together with the author&#;s answer. The author will decide on acceptance based on certain criteria. Essentially, the issue must be of sufficiently broad interest.

Please do not enter personal data here. (See also our privacy declaration.) If you wish to receive personal feedback or consultancy from the author, please contact him, e.g. via .

Your question or comment:

Goto ruiqi to know more.

Spam check:

  (Please enter the sum of thirteen and three in the form of digits!)

By submitting the information, you give your consent to the potential publication of your inputs on our website according to our rules. (If you later retract your consent, we will delete those inputs.) As your inputs are first reviewed by the author, they may be published with some delay.

Eyeglasses today are fashion accessories, as stylish as purses and belts. So don't fret if contact lenses bother your eyes. Instead, scope out the latest frames to give your face a fresh look.

What Types of Lenses Are Available?

As technology advances, so do lenses. In the past, they were made exclusively of glass. Today, most are made of high-tech plastics. These new ones are lighter, don&#;t break as easily as glass, and can be treated with a filter to shield your eyes from damaging ultraviolet (UV) light.

The following lenses are lighter, thinner, and more scratch-resistant than glass or the older plastic types.

Polycarbonate. These impact-resistant lenses are a good choice if you play sports, work where your eyeglasses could easily get damaged, or have kids who are tough on their specs. They also have built-in UV protection.

Trivex. They&#;re made from a newer plastic that&#;s similar to polycarbonate lenses. They&#;re lightweight, thin, and impact-resistant. They may also correct vision better for some people.

High-index plastic. If you need a strong prescription, these lenses are lighter and thinner than the old-school super-thick ones you may have had in the past.

Aspheric. These have various degrees of curvature. That means they can be thinner and flatter so you can use a much larger portion of the surface.

Photochromic. Sunlight changes these from clear to tinted. You may no longer need sunglasses, although they may not darken in your car if the windshield blocks UV rays. They can be either glass or plastic.

Polarized sunglasses. These lenses reduce glare from a surface like water, so they&#;re great for sports and driving. But they can make it hard to see the liquid crystal display on your car&#;s dashboard.

Your type of vision problem will determine the shape of your lens. You&#;ll need a concave lens (curves inward) if you&#;re nearsighted. A convex lens (curves outward) will help if you&#;re farsighted. If you have astigmatism, your cornea is shaped wrong, so your lenses may be more like a cylinder. Simply put, the lens is a tool you use to focus light onto your retina in the correct way.

Are you interested in learning more about Cylindrical Lens Glasses? Contact us today to secure an expert consultation!