Lazer Pen -

: When electricity hits the diode, it excites electrons, which release photons (light particles).

: Mirrors at either end of a small chamber bounce these photons back and forth, creating a chain reaction that intensifies the light.

: Typically AAA or lithium-ion batteries that provide the electrical energy. lazer pen

: A lens at the tip focuses the scattered light into a tight, parallel beam that stays concentrated over long distances. A Spectrum of Colors

The term "laser" is an acronym for . Inside the sleek casing of a laser pen, several components work in unison: : When electricity hits the diode, it excites

Not all laser pens are safe for casual use. They are classified by their power output (measured in milliwatts, ): LASERPEN the LASER PEN

: Appears much brighter to the human eye because our vision is most sensitive to the green spectrum. These are popular for stargazing as the beam is often visible in the air. : A lens at the tip focuses the

: A tiny semiconductor that converts electricity into light.