Introducing lasers
Lasers, known to humankind since the ancient Egyptians, proved themselves to be valuable time and time again during the construction of the pyramids – at least this is something a ufologist may suggest to us.
Jokes aside, in reality, lasers date back to 1916 when Albert Einstein first theorized their behavior. As you may expect from such an important physicist, grasping the fundamental nature of lasers is rather complex and would require us to be quantum physicists. That kind of understanding is outside the scope of this book, so instead, we will simplify things quite a bit.
Long story short, a laser is an energetic beam of light that is coherent and focused on a very tiny spot. I know that this may sound weird to most, but light is far more complex than most of us would imagine.
Light is an electromagnetic (EM) wave that we can see with our eyes. Saying that, not every EM wave is visible to the eye; it mostly depends on its wavelength, which is a...