http://www.outdoorlanternsonsale.com/flashlight-red/
Why do flashlights expand vs. Red laser pointers staying the same diameter when on?
The definition of LASER is Light amplification by stimulated emission of radiation.
wikipedia:
Light amplification by stimulated emission of radiation is a mechanism for emitting electromagnetic radiation, typically light or visible light, via the process of stimulated emission. The emitted laser light is (usually) a spatially coherent, narrow low-divergence beam, that can be manipulated with lenses. In laser technology, "coherent light" denotes a light source that produces (emits) light of in-step waves of identical frequency, phase, and polarization. The laser's beam of coherent light differentiates it from light sources that emit incoherent light beams, of random phase varying with time and position. Laser light is generally a narrow-wavelength electromagnetic spectrum monochromatic light.
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