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center: an area that is approximately central within some larger region; "it is in the center of town"; "they ran forward into the heart of the struggle"; "they were in the eye of the storm"

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Simple Laser Experiments To Share With Your Kids
The word "LASER" stands for Light Amplification

by Stimulated Emission of Radiation. A laser is an

optical light source that emits a concentrated

beam of photons. Lasers are usually

monochromatic – the light that shoots out is

usually one wavelength and color, and is in a

narrow beam.

By contrast, light from a regular incandescent

light bulb covers the entire spectrum as well as

scatters all over the room. (Which is good,

because could you light up a room with a narrow

beam of light?)

There are about a hundred different types of

atoms in the entire universe, and they are always

vibrating, moving, and rotating. Think of kids on

sugar. When you add energy to these atoms (even

more sugar to the kids), they really get excited

and bounce all over the place.

When the atoms relax back down to their

"normal" state, they emit a photon (a light

particle). Think of the kids as coming down from

their sugar high, and they all collapse on the

couch.

A laser controls the way energized atoms release

photons. Imagine giving half the kids sugar, and

picture how they would bounce all over the place

(like light from a bulb)when it took effect. They

would be very high-energy among the other half

who were contently sitting down.

Now imagine those sugar kids jumping in unison

(a focused laser beam). The sugar-kids are

infectious, and pretty soon, the kids around them

are joining in and sharing in their excited energy.

This is how a laser charges the atoms inside the

gas medium.

Now imagine a cat-flap that lets out a limited

number of kids out at a time, while the rest are

bouncing around inside, charging up everyone.

That cat-flap exit is the laser beam exiting the

laser. The atoms remaining inside the laser

bounce off mirrors as they charge each other up.

Before we start, you'll need protection – tinted

UV ski goggles are great to use, as are

large-framed sunglasses, but understand that

these methods of protection will not protect

your eyes from a direct beam. They are intended

as a general safety precaution against laser beam

scatter and spinning mirrors. (Yes, you will be

wearing sunglasses in the dark!)

A very neat addition to the experiments below is a

fog machine. (Rent one from your local party

supply store.) Turn it on, be sure you have good

ventilation, darken the lights, and turn on the

lasers for an outstanding laser experience!

A quick note about lasers: keychain lasers from

the dollar store work just fine with these projects.

Do not use the green lasers sold in astronomy

stores – they are too dangerous for the eyes.

Plastic Bottle Beam Fill up a plastic water or clean

soda bottle with water and add a sprinkle of

cornstarch. Turn down the lights and turn up the

laser, aiming the beam through the bottle. Do you

see

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the original beam in the bottle? Can you find

the reflection beam and the pass-through beam?

Light Bulb Laser In the dark, aim your laser at a

frosted incandescent light bulb. The bulb will glow

and have several internal reflections! What other

types of light bulbs work well?

CDs Shine your beam over the surface of an old

CD or DVD. Does it work better with a scratched

or smoother surface? You should see between

5-13 reflections off the surface of the CD,

depending on where you shine it and how good

your "seeing" conditions are.

Glass and Crystal Pass the laser beam through

several cut-crystal objects such as wine glasses

or clear glass vases. Is there a difference

between clear plastic or glass, smooth or

multi-faceted? Try an ice cube, both frosted and

wet.

Microscope Slides Shine the laser beam through a

flat piece of glass, such as a microscope slide or

single-paned window. Can you find the

pass-through beam as well as a reflected beam?

If you have it, fill a clear tank with water, add a

sprinkling of cornstarch, and put the slide

underwater. Shine the laser through the side wall

through the slide and both beams will be visible.

Lenses If you have an old pair of eyeglasses, pop

out the lenses and try one or both in the beam to

see the various effects. Try one lens, and then try

two in line with each other to see if you can

change the beam.

Filters Paint a piece of cellophane or stiff clear

plastic with nail polish (or use colored filers) to put

in the laser beam. You can make a quick

diffraction grating by using a feather in the beam.

If you have polarizer filters, use two. You can

substitute two sunglass lenses – no need to pop

out the lenses – you can just use two pairs of

sunglasses. Just make sure they are polarized

lenses (most UV sunglasses are). Place both

lenses in the beam and rotate one 90 degrees.

The lenses should block the light completely in

one configuration and allow it to pass-through the

other way.

Laser Maze Hot glue one 1" mosaic mirror (found

at most craft stores) to each wooden cube. In a

pinch, you can use aluminum foil or Mylar. Add a

fog source, such as a fog machine, dry ice, or clap

two (very chalky) chalkboard erasers together –

just be sure to have proper ventilation, as you will

also need the room to be very dark. Turn on the

laser adjust the cubes to aim the beam onto the

next mirror.

________________________________________

_____________________

As a teacher, engineer and university instructor

Aurora Lipper has been helping kids learn science

for over a decade.

Want More Cool Science Activities?

Rocket-launch your kid’s education by

downloading your free copy of the Science

Experiment Activity Guide from the Supercharged

Science website:

www.SuperchargedScience.com

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