Did you know that the term "laser pointer" is an acronym for "light amplification caused by stimulated emission of radiation"? Consumer laser pointers cannot pierce steel or destroy robots, but they can help you circle the main points and guide the audience through PowerPoint. It has been the main content of speeches since the 1990s, helping audiences who need to show up. So, where did it come from? And how does it work?
Theodore Maiman (Theodore Maiman) activated the first laser at the Hughes Research Laboratory in California on May 16, 1960, shining a high-power flash on a ruby rod on a silver-plated surface on. He immediately submitted a short work report to Physical Review Letters, but the editor refused. Some people think this is because the "Physics Review" announced that it had received too many papers on masers (the predecessor of the longer wavelength of the laser engraver) and announced that it would reject any other papers. But Simon Pasternack, the editor of Physical Review Letters at the time, stated that he rejected the historic paper because Maiman had just published it in June 1960. I wrote an article about exciting rubies with light and examining them. The relaxation time between quantum states, and the new job seem to be exactly the same. Pasternak's reaction may reflect the limited understanding of the nature and meaning of lasers at the time. Maiman was eager to publish his work quickly, and then turned to Nature, which was usually more selective than Physical Review Letters, where the paper received good reviews. It was published on August 6.
Since then, lasers have become part of everyday life. From optical drives and computer systems, to communication networks, and even visual displays for stadiums and performances. This is a short list, and you may be surprised to find that some of the items we use every day benefit from laser technology, or if blue laser pointer have never been developed, they may not even exist.
The third type of electron transition associated with photons in atoms is stimulated emission. Assuming that the electron is at a higher energy level, and the energy of the photon is equal to the difference between the energy of the electron and the lower energy, the photon will stimulate the electron to fall into a lower energy state, thereby emitting a photon.
The emitted photon will have the same energy as the original photon and be treated as a wave, and then we will generate two waves with the same frequency from the atom. Such waves will interfere constructively, resulting in stronger waves.