The term "laser" is an acronym for . Inside the sleek casing of a laser pen, several components work in unison:
: A lens at the tip focuses the scattered light into a tight, parallel beam that stays concentrated over long distances. A Spectrum of Colors lazer pen
: Typically AAA or lithium-ion batteries that provide the electrical energy. The term "laser" is an acronym for
: When electricity hits the diode, it excites electrons, which release photons (light particles). : When electricity hits the diode, it excites
: The most common and least expensive. They use simple diodes and are widely used in low-power pointers and barcode scanners.
: 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.
Laser pens come in various colors, each with different properties: