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LASERS are physics!

Physics is the science of matter and energy.

LASERS are all about energy and in its most simplest of terms, you could easily say that laser light is a perfect example of the power of positive energy.

When a type of matter such as a gas or a crystal or a semiconductor is pumped with energy, LASERS are created. The actual laser light that we are familiar with occurs when "Population Inversion" is achieved. Population Inversion occurs when a system such as a group of atoms or molecules exists in state with more members in an excited state than in lower energy states.

Sound complicated? It is not. Think of these atoms or molecules just lying around in the lobby of a hotel. Then suddenly, a bright light, no a super bright light, brighter than any light you can imagine bursts through the hotel lobby doors and "excites" these atoms up into higher floors or excites them so much they jump through the ceiling up into higher levels of the hotel. When you have more atoms in the excited state (so excited they are up partying on the 13th floor) than in a non-excited state (still down in the lobby on the main floor) you achieve population inversion and that's when laser light can occur!

Lasers are related to physics because it takes physics to understand how lasers work!

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