The laser itself exists. It was discovered and proposed by Einstein. Many industries will now include laser applications such as electronics and medical technology. The laser pen is composed of a semiconductor laser diode. There are many semiconductor laser diodes. Several laser boxes can be divided into green, red, blue and blue according to color. For these four colors, green is the most commonly used color Laser pointer at present. In terms of strength, it is very small. 5 MW to 5000 MW. According to different functions, a laser lamp can adjust the focal length to light cigarettes and firewood. It is said that someone invented a family white light. I don't know whether the transparent light is true or false. If you need anything, come to me. I think I can help you. I'll try my best.
For an atom, when it enters the earth state from the excited state, the energy released is electromagnetic radiation. If the frequency of electromagnetic radiation is in the range of visible light, what we see is light. Of course, most atoms have more than one excited state, and there are energy differences between these excited states. When an atom drops from a high excited state to a low excited state, it will also emit electromagnetic radiation. We call it the radiation emitted by mobile phones and computers in our daily life. In fact, it is electromagnetic radiation. Nothing special. There is no scientific evidence that electromagnetic radiation from mobile phones or computers is harmful to human body. The quantification of energy means that the energy of mobile phones or computers is harmful to human beings. The energy emitted by the radiation source cannot be considered low, and the energy can only be an integral multiple of the minimum value. After Planck published this article, he did not realize the importance of this article. He has always believed that the quantification of energy is only a useful measure, and there will be some classical theories to explain it in the future.