A photon with the proper wavelength being absorbed by a changeover can also trigger an electron to fall from the upper into the lessen level, emitting a fresh photon. The emitted photon accurately matches the first photon in wavelength, phase, and path. This process is known as stimulated emission. วิทยาการคอมพิวเตอร์และเทคโนโลยีดิจิทัล https://herodotusz852hjn2.digitollblog.com/profile