Practice: The Components and Operation of Lasers

Which of the following most correctly describes the quality of the active medium of a laser that is relevant to its ability to produce lasing?

  • AAn active medium contains completely ionized atoms.
  • BAn active medium contains atoms in which electrons tend to transition to excited states at the same rate that they tend to transition to relaxed states.
  • CAn active medium contains atoms with unstable nuclei.
  • DAn active medium contains atoms in which electrons tend to transition to excited states at a greater rate than they tend to transition to relaxed states.
  • EAn active medium contains atoms in which electrons tend to transition to relaxed states at a greater rate than they tend to transition to excited states.
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