By passing a standard wavelength laser (1064 nm) through a non-linear crystal, the wavelength is reduced to 532 nm. This light is further passed through another crystal, effectively reducing its wavelength to 355 nm. As a result, UV lasers are commonly called third-harmonic generation (THG) lasers.

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Ultraviolet lasers need to be made with special ultraviolet optics, having a high optical quality and (particularly for pulsed lasers) a high resistance to UV light. In some cases, the lifetime of a UV laser is limited by the lifetime of the used optical elements such as laser mirrors. For the extreme ultraviolet region, there are sources based on high harmonic generation. Such sources can reach wavelengths down to a few nanometers while still having a table-top format. The average output powers, however, are fairly low.

AG and AR coatings offer many benefits and are definitely worth the extra cost, especially if you find yourself bothered by glare. They can help you see better, look better, and feel better compared to wearing glasses with uncoated lenses.

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There are multiple types of lenses that feature AG and AR coatings. Some of the popular types of lens options that come with AG and AR coating options include:

An appointment with your eye doctor can help determine the type of lenses and lens coatings are right for you and your lifestyle. Looking for a pair of non-glare glasses? Visit Park Slope Eye in Brooklyn.

AG and AR coatings are not just for glasses. In fact, the technology was created to improve the view of telescopes, microscopes, and camera lenses.

UV Laser or Ultraviolet Laser offer extremely high photon energy which opens up a wide range of applications that can’t be addressed by visible and infrared laser sources.

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Unfortunately, light can also cause vision problems. Too much light, whether it be from reflection or glare, can make your eyes uncomfortable and can stop you from seeing sharp images.

Pulsed high-power ultraviolet lasers can be used for efficient cutting and drilling of small holes in a variety of materials, including materials that are transparent to visible light. High energy UV pulses are used for the technique of laser-induced breakdown spectroscopy. With far lower pulse energies in a precisely focused beam, one e.g. do microdissection of biological materials under a microscope or perform photoluminescence analysis (fluorescence lifetime measurements). Continuous-wave UV sources are required for micro-lithography and for wafer inspection, e.g. in the context of semiconductor chip manufacturing. Another application is UV Raman spectroscopy. Both continuous-wave and pulsed UV lasers are used for fabricating fibre Bragg gratings. Some methods of eye surgery, in particular refractive laser eye surgery of the cornea in the form of LASIK, require UV (sometimes even deep-UV) laser sources. Ultraviolet laser sources involve some special safety hazards, mostly related to the risks of eye damage and causing skin cancer.

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It’s important to point out that while 355 nm and 266 nm are the most common UV laser wavelengths, there are also several other Nd: YAG lines that can be doubled and tripled to produce a wide variety of UV wavelengths. To achieve these higher-order harmonics, the electric field density of the laser must be extremely high, as a result, these lasers are primarily available with q-switched lasers.  Continuous-wave (CW) UV laser diodes are also available at 375 nm, with both single-mode and multi-mode beam profiles, and with either free space or fibre-coupled outputs. OEM laser packages and CW laser modules are available for both ultraviolet laser diodes and q-switched lasers.

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AG and AR coatings are made of multiple layers of metal oxides, and they are applied to the surfaces of the lens. These layers effectively reduce the amount of light reflected onto your lenses, allowing more light to be transmitted through the lens without the glare.

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UV lasers use a highly absorptive wavelength (355 nm) to mark parts. This high absorption rate allows UV lasers to perform "cold marking," ensuring that no extra heat stress is applied to materials, including those with high reflectance such as gold, silver, and copper. This minimizes soot and burrs caused by typical marking and processing.

When you buy a pair of glasses, you should consider the many benefits coated lenses have to offer. During your next eye exam, talk to your eye doctor about what AG and AR coatings can do for you during your next eye exam.

Apart from real ultraviolet lasers, there are ultraviolet laser sources based on a laser with a longer wavelength (in the visible or near-infrared spectral region) and one or several nonlinear crystals for nonlinear frequency conversion. Some examples:

Lens coatings can give you a clearer vision that’s more natural compared to uncoated lenses. AG and AR coatings may be the right option for you if:

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Dr. Justin Bazan is a 2004 SUNY College of Optometry graduate. He established Park Slope Eye in 2008 with the goal of providing high quality eyecare and incredible eyewear for the neighborhood. He has a true passion for optometry and stay up to date with the current research and trends. He is active in the profession and holds several leadership positions on the local, state and national levels. Dr. Bazan is a Park Slope local and can often be seen out in the neighborhood so be sure to say Hi next time you see him!

These two layers protect your lenses and control the amount of light that passes through to give you the most accurate view possible.

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If you decide to get lenses with a special coating, there are additional steps you have to take to take care of them. We recommend the following care steps when dealing with coated lenses:

UVlaser wavelength

Anti-glare (AG) or anti-reflective (AR) lens coatings are specific coatings designed to decrease the amount of reflective light in your lenses. These coatings can be applied to the back, front, or both sides of your lenses to control the amount of light that enters your eyes.

With newer technology, more and more people are discovering the benefits of anti-glare and anti-reflective lens coatings.

AG and AR coatings eliminate almost all reflections from the surfaces of your lenses. Without these reflections, more light can pass through, which can increase your vision.

The truth is, there’s more to glasses than just handing in your eye prescription and choosing frames. A big part of picking the right pair of glasses is selecting a suitable lens material.