The wavelength of visible light determines the color in which the light appears. A prism separates visible light into its different colors.

The most basic solution to presbyopia is a pair of reading glasses, but they need to be taken off to see at a distance. Progressive lenses, which have multiple regions for viewing at different distances, can be worn all the time, but have notoriously little focus in the periphery.

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"More than a billion people have presbyopia and we've created a pair of autofocal lenses that might one day correct their vision far more effectively than traditional glasses," says Gordon Wetzstein, co-author of the study.

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We apply inline coherent imaging (ICI) to SLM when it is happening to track performance in real-time. ICI has a proven track record including successful commercialization in the fields of laser welding, cutting and micromachining. It promises to help unravel the complicated dynamics at the heart of laser 3D writing so we can build more complicated devices with a particular eye to novel materials.

However, despite sustained industrial investment, SLM part quality continues to suffer from inconsistency across individual parts, build volumes, machines and facilities. Even after time and capital intensive optimization, which is often specific to a given part, machine and/or material, the complex interplay of the physical phenomena underlying the process can still lead to stochastic outcomes. Robust and quantitative process monitoring and feedback control are essential tools required to overcome these challenges.

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No matter how good your eyesight, there's a decent chance that it'll start to fade at a certain point in your life. Presbyopia is a common form of age-induced far-sightedness, where the lenses in the eyes become stiff and have trouble focusing on close-up objects. Now a Stanford team has developed a pair of high-tech specs called autofocals, which use fluid-filled lenses, depth-sensing cameras and eye-tracking technology to make sure whatever a wearer is looking at stays sharp.

7 days ago — The meaning of LASER BEAM is the narrow beam of light produced by a laser.

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The next steps for the team are to downsize the technology – currently, they're bulky like a virtual reality headset, which was a common complaint from the study participants. Making them lighter, more energy efficient and more stylish could help them become an everyday item.

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The closest thing to the Stanford autofocals is a device from the University of Utah, which uses infrared pulses to measure the distance to objects and adjusts the focus of the lenses accordingly. But that didn't have eye-tracking.

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Research in ultrafast is truly cross-disciplinary since ultrafast processes are relevant in a wide range of fields, from semiconductor technology to bioprotein functionality. A key focus of our research is into the ultrafast of the ultrasmall. Man-made nanostructures provide a fascinating playground into the laws of quantum mechanics. Being small provides a complete new functionality and generates new applications all through novel ultrafast dynamics.

Selective laser melting (SLM) is a variant of additive manufacturing (AM) that has drawn considerable attention from industry over the past decade. SLM promises to consolidate many-step, complex manufacturing processes, which are often spread out over many facilities, into one single machine, allowing for direct 3D design to final part production. It offers engineers also limitless design freedom, whether it be custom hip implants or rocket engines.

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Since the angle of diffraction of the beam, , is equal to the angle between the wavefront and the plane of the slits, it follows that sin = QY/QP, where QP is ...

The Stanford autofocals are designed to fix those problems. The lenses in the prototype are filled with fluid that reacts to an electric current, becoming thinner and thicker to change the depth of the focus as needed. Working alongside those lenses is an eye-tracking system that watches where the wearer is looking, and a depth-sensing camera that calculates how far away a given object is, and adjusts the focus accordingly.

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What Michelson was advocating for was higher precision in scientific measurements. The answer to his call came over half a century later in 1960 with the invention of the laser. Since then lasers have become synonymous with precision and not just in the scientific community, fiber optic communication, consumer electronics and even the Internet are all built around the laser. The Ultrafast Laser Lab’s research aims to continue the laser revolution, using laser optics to advance science on two fronts:

The team tested these autofocals on 56 people with presbyopia. The test subjects reported that the new glasses made it easier and faster to read and do other tasks, compared to regular old progressive lenses.

The researchers acknowledge that they aren't the ones to invent either the lenses nor the eye-tracking tech, but they seem to be the first to combine the two into one system to tackle sight problems. Other similar devices have used the special lenses with motion sensors so they change to the right prescription when the wearer looks up or down, while others have wheels to allow the focus to be adjusted manually.

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Short optical pulses are produced by compressing a submicrosecond duration pulse into 100 femtoseconds. That corresponds to an intensity increase greater than one million. Also, since the optical source is a laser, all the energy can be focused into a spot size comparable to the wavelength of light. The result is a beam with an intensity measured in TW/cm2. Such an intense beam seriously perturbs any matter it interacts with, moving our exploration into the nonlinear regime. We now have access to excited states of the system, can read out novel information about system symmetry, and can bridge transitions that normally would be forbidden. We can control the system in novel and often counter-intuitive ways, and read out information from the system that would normally remain hidden.