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From energy levels to laser light

From energy levels to laser light

Energy-level comparison of absorption, spontaneous emission, and stimulated emission showing identical outgoing photons in the stimulated case

A photon is a discrete packet of electromagnetic radiation, and laser action depends on particles having allowed energy levels. When a particle changes level, it absorbs or emits a photon whose energy matches the gap:

Lasers Lesson

  1. A Level
  2. /Physics
  3. /Lasers

Step-by-step lessons covering Eduqas A Level Physics Lasers for A Level Physics. Each lesson works through exam-style questions in Component 1, Component 2 and Component 3 format. Physics is one of the most mathematically demanding A Levels -- a minimum of 40% of the marks require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.