: 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.
: Mirrors at either end of a small chamber bounce these photons back and forth, creating a chain reaction that intensifies the light. lazer pen
: Often more powerful and can cause fluorescence in certain materials, making them glow. Safety and Classification : Appears much brighter to the human eye
Laser pens come in various colors, each with different properties: each with different properties: