Answer to Question #306829 in Optics for aniket

Question

Determine the ratio of stimulated and spontaneous emission rates. Predict the temperature at which these rates will be same for wavelength 1000 nm.

Answer 1

• Bohr correctly proposed that the energy and radii of the orbits of electrons in atoms are quantized, with energy for transitions between orbits given by , where is the change in energy between the initial and final orbits and hf is the energy of an absorbed or emitted photon.
• Spontaneous emission takes place without interaction with other photons, and the direction and phase are random. Stimulated emission takes place when the excited electron interacts with another photon.
• When an isolated atom is excited into a high-energy state, it generally remains in the excited state for a short time before emitting a photon and making a transition to a lower energy state. This fundamental process is called spontaneous emission.