Vacuum Spatial Filter (VSF), is a vacuumized borosilicate glass cell at which center lays titanium pinhole. Spatial filter, a usual technique used to improve laser beam quality by removing noise from laser beams and resulting a smooth intensity profile. Since pulsed lasers have much higher pike power, vacuum cell is the only alternative, therefore a microscope objective (used to use for CW lasers) cannot be used to focus pulsed laser beams in to a pinhole because of COD.

Getting a trendy manicure that fully expresses your personality — think intricate designs, nail gems, the whole nine yards — has gotten increasingly expensive, yet extremely popular amongst the online beauty community. So when TikTok began circulating a cheap hack using press-on nails and gel curing, DIY-ers everywhere rejoiced. But nail professionals have issued a dire warning against the viral beauty trend.

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If nail enthusiasts do want an affordable alternative to salon-quality manicures, nail techs do agree that a gel bonder can still be used at home — it simply must be under a clear nail attachment and with a proper lamp. This, of course, then does require you to paint them yourself, making the hack much less useful to the less artistically inclined.

In many TikTok videos recommending the hack, viewers are told to use any affordable UV lamp they'd like to purchase, with a popular option being a mini lamp meant to be used for flash curing. Thomas has a separate video outlining the requirements for a safe nail UV lamp, which she says should be at least 48W and have a reflective bottom border to properly cure gel onto nails.

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Jennimai is a tech reporter at Mashable covering digital culture, social media, and how we interact with our everyday tech. She also hosts Mashable’s Snapchat Discover channel and TikTok, so she naturally spends way too much time scrolling the FYP and thinking about iPhones.

A gel bonder like Extend Gel is meant to be used with entirely clear nail extensions, to be painted after application and fully curing. If gel is left uncured or only partially cured, the nails underneath may develop contact dermatitis and/or have an allergic reaction, which prevents the wearer from ever properly using a gel-based product again. According to Thomas, improperly cured gel also allows moisture to get trapped under the press-on nail, which could possibly lead to mold.

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"I personally think this is a very alarming and scary trend that's happening on TikTok at the moment," says Amber Thomas, founder of The Healthy Nails Collaborative, in her video. "UV light cannot go through a full cover press-on nail that is colored. It needs to be absolutely clear… You are leaving yourself open to developing an allergy to gel products."

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The trend in question began circulating earlier this summer when creator @yasyyada's video brought it to the spotlight, raking in 2.3 million views. It involves using a bonding gel adhesive like Aprés's Extend Gel to attach inexpensive press-on nails that you'd typically get from a drug store. After applying the nail, the technique tells viewers to cure under a UV lamp, which should dry out the gel and produce a long-lasting and intricate manicure for low effort and low cost.

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Somehow, taking the time to pick up some nail art skills seems worth it to avoid the burning, itching pain from a gel allergy. But maybe that's just us?

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Geola Digital designs and manufactures Vacuum Cells, which are intended for pulsed laser application. The cells can be manufactured with pinhole at the center (VSF) or without pinhole inside the cell (VC).

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Both the issue and the draw, however, are that most affordable press-on nails from a drugstore come pre-designed. The nails are already painted and often feature impressive designs that nail novices can't accomplish themselves at home, making the whole process much easier. But those designs make the nails not completely clear, as Thomas says is necessary, and therefore block the UV light from actually fully curing the nail and the gel bonder beneath it.

Other TikTokkers are also warning against the trend after trying it themselves and experiencing adverse effects. "My nails looked great until they started itching so bad that I had to pour almost boiling water on my nails just to try to ease the pain," said user @k.wamp in her video. "And then my fingernails were so squishy underneath they were falling off."

Vacuum cells (VC), vacuumized borosilicate glass cell with vacuum of up to 10-5 mbar level. Pulsed laser manufacturers or laser photonics folks using Relay imaging systems to control diffraction and preserving the spatial structure of laser beam. The focal plane of Kepler telescope is weakest part of such systems frequently leading to air-breakdown. The best solution is a focal plane being situated in the glass Vacuum Cell (VC). Geola Digital designs and manufactures Vacuum Cells, which are intended for pulsed laser application. The cells can be manufactured with pinhole at the center (VSF) or without pinhole inside the cell (VC).

Zur numerischen Charakterisierung der normalen Flachheit von kohärenten Garben. Author(s) -. Herrmann Manfred,. Vogel Wolfgang. Publication year - 1973.

GEOLA – General Optics Laboratory. Started in 1996, from 1998 on the market. For more than 15 years our mission is to supply you with innovative solutions in pulsed-laser photonics and spatial imaging. Geola Digital UAB is situated at the center of Vilnius – capital city of Lithuania. Lithuania is European Union member from 2004