LAAAAAAAAAAAASERS!

L.A.S.E.R. – Light Amplification!• LASER, acronym

for Light Amplification by Stimulated Emission of Radiation. Lasers are machines that amplify light… usually they amplifyinfrared or ultraviolet light.

Light Amplifier!• Think of an AMPLIFIER for

your guitar, bass, or microphone; they AMPLIFY the sound and make it much louder and more POWERFUL! Lasers are like light amplifiers; they make the light more powerful and intense…. just like your guitar amp makes the SOUND much more powerful and loud.

Difference between amp and laser…• A guitar amp will work

with a huge RANGE of notes, scales, tones, etc., kind of like how light has many different colours.

• LASERS use only ONE “note” or ‘colour’ and amplify it.

These light rays are NOT parallel.

• Lasers work so well because they can concentrate a HUGE amount of energy into a narrow, focused beam of light… all going in ONE direction.

Rays of light.

In a laser, all the rays are grouped together (parallel) and travelling in ONE direction!

How are lasers used?• Lasers have been used

to drill holes in diamonds, to cut metal for tools, to make micro-computer parts (very small computer parts) and electronics…

How are lasers used?• To cut fashion

patterns, to synthesize (make) new material, and to help with scientific research, communication, medicine, the military, and arts.

Medical lasers• Lasers can be used to

slice/cut the skin like a knife for surgery or to help SEAL (close) a cut or wound. Medical lasers can cut and cauterize (burn) the skin VERY QUICKLY, without damaging the surrounding healthy tissues.

Medical lasers• They can be used to

destroy CANCER cells, without hurting the normal healthy cells nearby!

Laser Eye Surgery… video!• Lasers can be

used to re-shape the cornea and fix people’s eye-sight! Mr. Mitchell now has perfect 20/20 vision from this!

Scar removal and skin treatment

Military uses!

Laser Target-Designator

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The future of driving…• Some new cars use lasers

as SENSORS; the lasers REFLECT or REFRACT off other objects (like other cars, people, animals, etc.,) that could be dangerous, and then send a WARNING to the driver!! In the future, laser sensors and laser communication systems could help cars drive by themselves!!

Concert: Tupac Shakur, April 25th, 2012. He died in 1993! Is it a zombie? A ghost?

Home use…

Laser tag!

7-11!

Music!!

How does a laser work? (Advanced video!!)

• Any questions?? Answer the questions!!