WEBVTT

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lasers they can be found in everything from grocery store scanners and printers

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to lethal alien blasting weapons and

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ill-tempered sharks to protect your freaking evil layer okay the last two

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are science fiction but lasers were originally developed for scientific

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applications that were very much real it was all the way back in 1917 that the

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illustrious Albert Einstein published a paper containing the underlying science

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that would allow light to be Amplified enough to form a laser beam but it

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wasn't until the late 1950s that the idea really took off with the first ever

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laser being turned on in 1960 it didn't take long then for people

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to find real applications for lasers as the laser was used to treat an eye

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patient the very next year and then by 1969 we were using lasers to estimate

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the distance to the Moon but how do lasers generate powerful enough light

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for these cool uses the idea basically boils down to the way electrons that

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spin around the nuclei of atoms behave you see electrons can gain or lose

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energy in a number of ways which can happen if light hits them inside of a

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laser a powered lamp flashes and the light from this flash energizes or

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excites electrons in a material called a gain medium some of these excited

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electrons spontaneously lose their energy and in the process give off a

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photon an extremely tiny unit of light the photons then hit other excited

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electrons causing more and more photons to be released which travel at exactly

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the same angle and phase as the original Photon eventually enough inphase photons

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will bounce back and forth off of two mirrors on either side of the laser and

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shine through one mirror which is semi-transparent forming a laser beam

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that you can use to play with your cat laser beams are powerful due to the way

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the internals amplify the light and they're narrow due to the fact that the

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photons are coherent or in phase and

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although the first laser was that familiar red col

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these days we can produce many different colors of laser light by using different

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gain media different materials will emit different wave lengths of light and also

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need different amounts of energy to excite their electrons both the costs of

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these various materials and their different energy requirements contribute

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to the fact that some colors of laser are more expensive than others with red

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typically being the most readily available and cheapest and with

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advancements in laser design it's become one of the most versatile pieces of

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Technology invented in the last 100 years high energy lasers have made it

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possible to cut things with light alone send data over very long distances

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through fiber optic lines identify fingerprints with Precision at crime

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scenes and even remove embarrassing body hair we're seeing other cool stuff too

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like Facebook Aquilla an experimental drone that transmits data at very high

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bandwidth using laser light and of course we'd be remiss if we didn't

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mention the humble optical drive which while it might be on its way out really

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got people thinking about the benefits of using lasers to store access and send

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information but if lasers have been around for over half a century why then

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don't we have cool weapons like the phasers from Star Trek well the main

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hurdles to a real life laser guns are power we just haven't gotten energy

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sources powerful enough to weaponize lasers shrunk down to any kind of

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practical size and efficiency as lasers

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strong enough to cause physical damage are susceptible to overheat heating

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however active Research into directed energy weapons has made some progress in

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recent years just don't hold your breath waiting for someone to turn the moon

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into oh I don't know a space station

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speaking of directed things what if there was a way for people to easily

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Linked In the video description go check it out so thanks for watching guys if

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