Optical cavity

An optical cavity is like a special room where light can bounce around and reflect off of mirrors. Imagine you're in a big empty room with really shiny walls. If you make a noise, the sound waves will bounce off the walls and keep bouncing back and forth between the walls. This is kind of like what happens to light in an optical cavity.

The mirrors in the optical cavity are really good at reflecting light, so when a beam of light enters the cavity, it bounces back and forth between the mirrors. This creates a kind of standing wave pattern where the light waves are perfectly in sync with each other.

This is really useful for all sorts of things like lasers and sensors. When light is trapped in an optical cavity, it amplifies the light and makes it really powerful. This is why lasers can be so strong and precise.

Overall, an optical cavity is like a fancy room that light can bounce around in and create really cool effects!