How Do Lasers Work?

Lasers can cut through steel quickly. They work by controlling photon emissions from atoms. When energy excites an atom, it emits photons as it returns to its ground state. Lasers use a crystal with mirrors to amplify these photons, creating a coherent light beam. First demonstrated in 1960, lasers are now used in electronics, manufacturing, and medicine, capable of precise tasks like eye surgery.

What happens to an atom when it returns to its ground state?

• It gains energy.

• It splits into two atoms.

• It emits a photon.

• It absorbs a photon.

What is the role of mirrors in a simple laser?

• To cool down the laser.

• To reflect photons back and forth.

• To change the color of the light.

• To absorb excess photons.

How does stimulated emission contribute to laser operation?

• It decreases the frequency of photons.

• It changes the direction of photons.

• It reduces the energy of photons.

• It amplifies the radiation by releasing more photons.

Which of the following is NOT a common use of lasers?

• Generating electricity

• Reading barcodes

• Performing eye surgery

• Cutting metal

What characteristic of lasers makes them suitable for eye surgery?

• Their high power

• Their ability to change colors

• Their precision

• Their ability to generate heat