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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