Stimulated Emission

Mr. Andersen explains stimulated emission in AP Physics Essentials video 137. He introduces the concept using red light and describes how photons can be directed coherently to form a laser. The video covers stimulated absorption and emission, using energy diagrams to illustrate photon interactions. It explains how lasers are built by reflecting photons with mirrors. A PHET simulation demonstrates these concepts, showing how wavelength affects energy levels and photon coherence. The video concludes by reinforcing the connection between energy levels and photon absorption or emission.

Describe how a laser is formed using stimulated emission.

How does the wavelength of light affect the energy levels of atoms during stimulation?