Super-deep jokes about science

The principle of laser is simply the stimulated radiation amplification of light, which is responsible for the synchronous transition of atoms excited by pump light under the excitation of seed light source to realize the compound amplification of seed light. What's more, the principle of laser is a whole book and a whole course in university, which needs to be completed in one semester. I recommend you to read Laser Principle, which explains the cause of laser, laser gain, loss and level in detail.

In medicine, laser therapy is more commonly used now. Using high-energy laser to cut something from the body makes the wound small, fast and effective. There are also some advanced ones, such as laser optical tweezers. But laser can't cure all diseases!

There is no loss, not only laser, but also any light can travel infinitely far. Of course, laser has good collimation and high energy, and it has more advantages than ordinary light sources in long distance and considering loss propagation! Some high-energy lasers can travel thousands of kilometers, but if they travel in low-loss optical fibers, the distance is even longer!

Can lasers kill people? Joke: Americans shot down their satellites with laser cannons. Do you think they will kill people? The high-energy laser commonly used in our laboratory irradiates the body 1, and it will feel the heat in 2 seconds. Ultra-high-energy lasers are still wearing radiation protection suits. That kind of laser basically hits your eyes, and you will see things collapse in your life!