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 2024-11-03 20:36:16

Diffractive IOL

Metalens

There are various methods for computer design of diffractive optical elements, the most common and successful is using an Iterative Fourier Transform Algorithm, or I.F.T.A.

Diffractive optical elements are designed with computer generated patterns using an iterative fourier transform algorithm. These patterns are then being etched or otherwise transferred onto an optical window, creating a flat, thin and lightweight compact solution for beam shaping.

Diffractive beam splitters are typically integrated into laser devices who can benefit from parallelization of the process they are designed to perform, and thus increased throughput. Common examples include:

Diffractive Optics Canon

Diffractive optical elements are integrated into various laser systems to generate a more optimal output beam for the process. The beam optimization can be done by either modifying the spot shape, splitting the beam into multiple beams, or combining the two options.

The Nd:YAG Laser has been largely effective in the removal of well-defined brown spots for more than a decade. The reduction or removal of unsightly birthmarks may greatly improve one’s sense of confidence and self esteem, although individual results do vary from patient to patient. However, most patients require only one treatment and the results are dramatic. While there is some mild irritation to the skin post-treatment, which usually lasts a few days to a week, many patients do not mind tolerating it because the Nd:YAG laser saves patients the inconvenience of repeated trips to our center.

Before your procedure, avoid excessive sun exposure and tanning for one month. During the treatment process, the patient must wear eye protection, which will be provided to you in the form of an opaque covering or pair of goggles. If a patient is particularly sensitive to pain, topical anaesthetic may be applied to the treatment area but is usually not necessary or required.

A diffractive optical element design requires a measure of expertise from the optical designer, to properly and accurately plan the formation of the microstructures topography in a way that will both meet the optical requirements and the manufacturing tolerances. This is why experience and know-how are crucial in this field to generate the correct pattern.

Diffractive Optics

To soothe the treated area, an ice pack may be applied immediately following treatment. In the first few days after your procedure, care should be taken to avoid scrubbing the area and the use of abrasive skin cleansers should also be avoided. The application of a bandage or patch may help prevent abrasion of the treated area. During the course of treatment patients should protect the area from sun exposure to reduce the risk of postinflammatory pigmentation.

Other functionalities that can be realized with diffractive optical elements are beam focal shaping, meaning – applying a Z-axis modification on the beam, such as “stretching” the beam waist or splitting the focus into multiple foci along the propagation axis.

Diffractive lens

The selective 532 and 1064 nm wavelength in the Q-Switched Nd: YAG laser treatment has strong absorption in oxyhemoglobin and melanin, resulting in selective heating of veins and hair follicles. This helps produce excellent clinical results. The powerful contact cooling enables treatments to be safe for all skin types and tanned skin, skin tightening, and for the removal of superficial and deep pigment such as age spots, sun damage, freckles, moles and birthmarks. This laser can be safely used in all skin types for laser skin toning, which will help give your skin a youthful glow.

We are an experienced, multi-disciplined team of Dermatologists, Cosmetic Nurses and Patient Coordinators with training in both cosmetic and medical procedures. Together, we work to provide all of our patients with the best care possible.

In some applications, there is a requirement for custom solutions composing both splitting and shaping the beam and thus creating either uneven multiple spots, or multiple shaped spots. With diffractive optical elements, this can almost always be achieved with a single component.

Diffraction optical elements are passive optical devices used in laser systems to alter the phase of the light and generate various intensity distributions at the output.

Holo/Or was the first company to introduce diffraction optical elements for commercial applications over 30 years ago. Since then we have mastered the art of light shaping according to our customers specifications and needs. We welcome the challenges posed to us by our customers as they discover new and exciting applications for using our components.

Diffractive vs refractive optics

Diffraction optical elements are passive optical devices used in laser systems to alter the phase of the light and generate various intensity distributions at the output.

Opticalcomponents

Diffraction optical elements, otherwise known as holographic elements or computer generated elements, are window-like components with micropatterns etched or otherwise structured onto their surface. These microstructures, when illuminated with a coherent laser beam, create a phase delay in a portion of the light propagated through them, and thus generate a different output far-field illumination profile than the profile of the input beam.

Diffractive beam shapers pose a huge advantage to system designers who require highly accurate or uniform processes, or avoid overlaps and gaps on the treated surface. In such cases typically a square or rectangular shape is desired. These elements are frequently used in area surface treatment devices such as:

This makes the Q-Switched Nd: YAG laser essential in the treatment of skin pigmentation. The pulse delivered by the laser is powerful enough to destroy its target, without harming surrounding skin. The laser treatment will consist of placing a hand piece against the surface of the skin, which activates the laser. Many patients describe each pulse feeling like the snapping of a rubber band against the skin, which is very tolerable during the treatment process.

Diffractiveoptical element

Lasers work by emitting a wavelength of high energy light, which when focused on a certain skin condition will create heat and destroy diseased cells. Delivering brief, intense pulses, a Q-switched Nd: YAG laser produces light that travels at the 1064 nm wavelength. However, most Q-Switched lasers also have a KTP filter that frequency-doubles the light into the 532 nm wavelength.

The most common uses for diffraction optical elements are for beam splitting and beam shaping. A diffractive beam splitter, or multispot, generates multiple output beams with controlled separations between them from a single input beam. Generally, all output beams will share the same intensity profile and spot size at the focus plane, as the original input beam. The output beams can be arranged in any desired order from a row, to a matrix, a circle or a target, even a pseudo-random array of spots is possible with these components.

A diffractive beam shaper, as implied by its name, modifies the output beam to a uniform intensity profile having any desired spot shape with sharp edges and a steep energy drop-off between the spot (the treated area) and out of it.

Depending on the procedure and treatment area, results vary from patient to patient. When undergoing hair removal, patients generally receive between 2-6 treatments, spaced at 4-6 week intervals. Patients with darker skin tones may require more treatments. For tattoo removal, the colour of the tattoo and depth of the pigment impacts the duration and overall outcome of the laser treatment. To achieve favourable results, multiple sessions (5-20) spaced at 7 week intervals may be required. During your consultation, our team at The Centre for Dermatology will work with you to determine the best treatment schedule for you based on your skin conditions and the results you desire.

The output beams generated by diffraction optical elements can have various optical and functional characteristics. The flexibility they provide, along with their compactness and relatively low price in comparison to alternative solutions to achieving similar results, makes diffraction optical elements a highly attractive beam shaping solution for many laser system engineers in various fields of applications.

Please note that this website is strictly for cosmetic procedures. We do not give medical advice online. A Doctors referral is required for a medical dermatology consultation.

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