Stimulated emission

The transcript explains how photons interact with atoms or molecules when struck by another photon of the right energy. This interaction is crucial in lasers, where it generates a beam of photons that share the same frequency and direction.

What happens to an atom or molecule when it is hit by a photon of the right energy?

What is meant by 'millions of photons of the same frequency' in the context of lasers?

Describe the process that occurs in a laser to create a beam of photons.

What is the significance of the frequency of photons in a laser beam?

Explain how photons in a laser beam travel.