Green laser pen, green laser pen, laser TV, laser all-in-one machine... In life, laser items can often be seen. What is laser? How did laser appear? Why are there so many uses?

        In fact, laser does not belong to the pure natural light of nature. It is light formed by a physical principle. If you want to find out how laser appears, you must master some physical concepts. The first concept is transition. In the scientific system that has been found now, all matter is composed of atoms, and atoms are composed of atomic nuclei and extranuclear electrons. Extra nuclear electrons in different orbits of hydrogen atoms revolve around the nucleus. Electrons in low hydrogen atomic orbitals must absorb certain energy if they want to transfer to high hydrogen atomic orbitals. Conversely, electrons in high hydrogen atomic orbitals must release some excess energy if they want to transfer to low hydrogen atomic orbitals. The next concept is the whole process of luminescence. Generally, in the absence of external influence, the atoms of high hydrogen atoms will spontaneously transition to the low energy level and release the excess energy in the form of luminescence. The whole process of luminescence is called spontaneous emission. This is the basic principle of fluorescent lamps and fluorescent lamps used in our homes.