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What is the principle behind the operation of a laser?

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Question: What is the principle behind the operation of a laser?

Options:

  1. Spontaneous emission
  2. Stimulated emission
  3. Absorption
  4. Reflection

Correct Answer: Stimulated emission

Solution: 

Lasers operate on the principle of stimulated emission, where an incoming photon stimulates an excited electron to emit a photon of the same energy, phase, and direction.

What is the principle behind the operation of a laser?

Practice Questions

Q1
What is the principle behind the operation of a laser?
  1. Spontaneous emission
  2. Stimulated emission
  3. Absorption
  4. Reflection

Questions & Step-by-Step Solutions

What is the principle behind the operation of a laser?
Correct Answer: Stimulated emission
  • Step 1: Understand that a laser produces light.
  • Step 2: Know that light is made of tiny particles called photons.
  • Step 3: Learn that in a laser, atoms are energized, making their electrons jump to a higher energy level.
  • Step 4: Realize that these energized electrons want to return to their normal state.
  • Step 5: When an incoming photon hits an excited electron, it can cause the electron to drop back down.
  • Step 6: This drop releases a new photon that has the same energy, phase, and direction as the incoming photon.
  • Step 7: This process of one photon causing another is called stimulated emission.
  • Step 8: Many of these stimulated emissions happen in a chain reaction, creating a strong, focused beam of light.
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