User blogs

Buy Laser Pointer

IN THE LAST 20 years, green lasers have shrunk from table-size lab equipment to pocket-portable presentation tools (not to mention cat toys). But making laser pointer 30mw a household item may have come at a cost. A new study from the National Institute of Standards and Technology reports that some cheap laser pointers can emit more than 10 times as much invisible infrared light as bright green light, making them more likely to blind kids and pets.

“It’s a serious problem,” said NIST physicist Charles Clark, a coauthor of the study. “If green goes into your eye, you’ll probably blink because you can see the green. But with infrared, you won’t blink. The first indication that you have that infrared is coming in is that you’d start to lose your vision.”

Luckily, there’s a science fair-worthy way to test your laser pointer for safety. All you need is a digital camera, a webcam, a CD and a few paper cups.

When green laser pointers first hit the market in the 1990s, they would set you back about $400. These days, they go for as low as $7.75 on Amazon. The average pointer makes its bright beam of light in three steps, each of which was a highlight in laser development when it first came out. “It’s like a little lesson on quantum physics all in itself,” Clark said.

The trick is to convert two photons of long-wavelength, low-energy infrared light into one photon of short-wavelength, high-energy green light in a process called frequency doubling. First, two AAA batteries fuel a diode laser — similar to a standard laser pointer 20mw — which emits infrared light at a wavelength of 808 nanometers. That light gets funneled into a crystal of a material called neodymium-doped yttrium orthovanadate, which is common to lab lasers. The crystal’s electrons respond by getting excited and emitting infrared light at 1064 nanometers, which goes through a second crystal made of potassium titanyl phosphate. That crystal combines two infrared photons into one photon with half the wavelength and double the energy, the familiar 532-nanometer green light.

The standard green laser pointer also includes a shield to keep any of the infrared light from escaping. But in the pointer that Clark and his colleagues examined, the shield was entirely missing. There wasn’t even a holder where a shield should be.

“That was a design choice,” said NIST physicist Edward Hagley, a coauthor of the study. “What we think happened is, if one of the suppliers decides to get rid of the filter and save 50 cents, they can reduce the price a little bit and drive everybody out of business. Then everybody else has to do the same thing.”

Hagley noticed the problem when he bought three $15 laser pointer 10mw last December as Christmas presents for his in-laws. Each pointer claimed to emit 10 milliwatts of power, but one of them glowed with a much dimmer green beam. Not only was the dim pointer missing its infrared shield, it also turned out to emit 20 milliwatts of invisible infrared light during normal use. The extra infrared is probably due to a misalignment between the diode laser and the crystals, making the conversion from infrared to green light less efficient.

The total power isn’t that much, about a thousandth of the output of a typical flashlight, Hagley noted. The danger is that laser light is a focused beam of a single wavelength of light, meaning 20 milliwats is enough to burn a hole in your retina before you blink.

“It is a very big safety hazard,” Hagley said. “People who have these laser pointers shouldn’t think they’re safe just because they’re not outputting much green. I know my kids would stick them right in their eyes. And that would be bad.”

these lasers are used by astronomers to study stars because they usually

The Laser Pointer we will present them in this paper is one of the most dangerous toys that are available in the market, the manufacturer warns that can have devastating effects if given misuse. The problem is that we have Laser Pointers idea what the "fair use" or the real and serious mood usefulness of the product but it is a striking toy. Wicked Lasers firm based in Hong Kong submitted a laser pointer equipped with a blue laser diode equal to the inside of a reader Blu Ray. This firm offering 500mW green laser pointers, is proud to present its blue Spyder III Pro Arctic model 1W as the most powerful in its catalog and more dangerous than ever offered for sale. Blue Laser Pointer 2000mw Strictly speaking, the Artic is a pointer and not really a lightsaber, though he referred to it as if it were in an obvious nod to the fans of Star Wars.

As usual, the pointers are used, for example, in presentations, do not exceed this limit, "but it is easy to find in the network products, under a seemingly innocuous, they are dangerous to eyes". SoLaser Pointer 10mW highlighted that recent cases of use of laser light in football fields and to target aircraft "have highlighted the lack of awareness about it."The laser light is classified into four types: type 1, lower power, class 4, which is dangerous and may lead to loss of vision, so that their use requires "extreme caution." "The danger threshold beam stands at 5000mw laser pointer, and all products that exceed this power can cause serious injury," he warned the SOCV.2000mW Levin series blue laser pointer is the first high-powered portable 445nm blue laser you can legally own the land. Projects brighter the cool blue laser beam with controllable visibility of 8000 meters in the dark. This is the best recommendation for fans and enthusiasts looking for more powerful handheld laser world.

The green laser pointers Warnlaser are renowned for its small beam diameter and high power output. With the inherent human sensitivity to green color, our green laser pointers create the most powerful laser beams and brightest that can be seen anywhere. These beams carry the destructive powers so great that pass through almost any meltable and flammable object. They also travel tens and hundreds of kilometers in the dark. Exceptional power, high-energy beam intensity and super long distance, all they create a pheromone only seen in sci-fi movies. Because of these characteristics, these lasers are used by astronomers to study stars because they usually can be seen visually reaching the stars of perspective here. It is often also seen in US military operations to mislead and intimidate the enemy, because of their exceptional beam qualities and highly durable construction.

Other mw red laser pointer 10000 physicians are widely used in ophthalmology for healing purposes, and specialists know, therefore, the consequences could be improper device, manipulated by those who know their risks. He also explained that the eye has a defense mechanism known as "aversion response", which is that when a bright light strikes the eye, it tends to close quickly elpárpado, or moves in a different direction of light.High Quality Ultra Powerful Laser Pointer , compact, easy to carry, burning lighter, matches, balloons, candles and more. Blue laser pointer is strong enough 20000mW powerful, even in the day, you can see the bright blue laser beam. Manual focused laser spot beam and a powerful blue laser pointer, you can see. Eg plastics, foils, etc.