Lasers produce the narrow light beam in which every light wave has similar wavelengths. The light beam from lasers doesn’t get weaker or wider as many light sources do. It normally uses special crystals or gases to make a light have the single color. Then the mirrors are being used to amplify that color of the light and to ensure all light are travelling in one direction, hence it stays like the narrow beam. The interesting facts about lasers is that when being pointed to something, the narrow beam will make the single point of the light. Every energy of light stays to that one which is narrow beam other than spreading like the flashlight.
The lasers create light using the special actions that involved the material known as optical gain medium. The energy is kept into the material using the energy pump. Actually, this will be another light source, electricity, or other energy source. The energy makes this material go to what is known as excited state. The electrons in a material have additional energy, and within sometimes they can lose the energy. Once the energy is lost, they can release the photon. The optical type gain medium will change the wavelength being produced releasing the photons is an Emission of Radiation.
Different things will radiate light, such as fluorescent light bulb, however, the light cannot be controlled in one phase or direction. By using the electric field that controls how light is being created, the light will be one, going to one direction which is Stimulated” Emission of the Radiation.
In the moment, light is weak. Mirrors on any side reflect the light to and fro, and this hits the other parts of an optical gain medium, which cause these parts to release photons, hence generating more light. When every optical gain medium has produce light, which is termed as saturation and then creates the very strong light beam at the narrow wavelength that is called the laser beam.
Light moves to the medium which is between two mirrors which reflect the light to and fro between them. One mirror, however, will reflect the light, enabling some to escape. Escaping light form the laser beam. Generally, this is the simple design; type of the optical gain medium which is used to define the type of the laser. It may be the crystal where examples are the ruby and the garnet crystal which are made of aluminum and yttrium with a rare earth metal being mixed in.