Laser pens come in various colors, each with different properties:
: 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
Not all laser pens are safe for casual use. They are classified by their power output (measured in milliwatts, ): LASERPEN the LASER PEN Laser pens come in various colors, each with
: Mirrors at either end of a small chamber bounce these photons back and forth, creating a chain reaction that intensifies the light. : The most common and least expensive
: 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.
: Typically AAA or lithium-ion batteries that provide the electrical energy.