At the atomic level, a laser works by pumping energy into electrons bound to an atom, which pushes the electrons to a higher quantum energy level (a). The electrons remain in the upper level for a period of time, effectively storing the pumped energy.

Why are high power lasers illegal?

In the U.S., it is legal under federal law to own a laser of any power. … This is somewhat confusing shorthand meaning that the manufacturer or seller illegally called a laser above 5 milliwatts a “pointer”, or illegally promoted it for pointing purposes.

How does a laser get its power?

A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become “excited.” The excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom’s nucleus.