How lasers work (in theory)

The video explains how atoms emit light when excited and how photons stimulate each other to emit more light. By trapping light between mirrors, a cascade of illumination is created. Photons tend to be in the same state, unlike coins, which leads to coherent light emission. This behavior is harnessed to create a laser beam by allowing photons to interact and stimulate further emission.

What happens when atoms are excited and emit light?

• They release photons spontaneously.

• They absorb more energy.

• They stop emitting light.

• They change color.

Why is it beneficial to trap light between mirrors?

• To increase the energy of the photons.

• To stimulate more light emission from atoms.

• To change the color of the light.

• To reduce the speed of light.

How do photons behave differently from coins?

• Photons do not interact with atoms.

• Photons can be easily distinguished from each other.

• Photons prefer to be in different states.

• Photons are more likely to be in the same state.

What is the likelihood of an excited atom emitting a photon when a solitary photon passes by?

• There is a good chance it will emit a photon.

• It will absorb the solitary photon.

• It will definitely emit a photon.

• It is unlikely to emit a photon.

What is the result of allowing coherent light to escape through a small opening?

• A scattered light beam.

• A laser beam.

• A dim light.

• A colored light.