Lasers are created when electrons in the atoms in crystals, gases, or special glasses absorb the energy from the electrical current or excited electrons. These excited electrons moves from the lower-energy orbit to the higher-energy orbit in the entire nucleus atom. Once they go back to their normal state, electrons emit photons. These photons have similar wavelength and they are coherent, which means the troughs and crests of light waves are in lockstep altogether. In difference, ordinary visible light consists of multiple wavelengths which are not coherent.
The interesting facts about lasers is that their light are different from the normal light in various ways. Firstly, its light has only one wavelength. The light wavelength is determined using the amount of the energy being released when excited electron drop to the lower orbit. Secondly, lasers light are directional. While the lasers generate tight beam, the flashlight produces light which is diffuse. Since lasers light are coherent, they remain focused for long distances, including fro and back to the moon.
In NIF, like many large lasers, the intense white light flashes from the giant flash lamps pump the electrons in the large slabs of the laser glass to the higher-energy state which lasts for about one-millionth in one second. The small laser light pulse tuned to excited electrons’ energy being directed to the glass slabs. The lasers pulse stimulates electrons to go to the lower energy states hence emitting laser photon of the same wavelength.
The lasers may be tiny consists of microchips, which is 10 times high and wide like 3 football fields. They are found in the dazzling range of technologies or products that include DVD and CD players, measuring systems, cosmetic and eye surgery, and metal-cutting machines. Early lasers can produce the peak powers of 10,000 watts. The modern lasers will produce pulses which are billions times powerful. The scientists have proven the ability of NIF to produce more power which is 500 trillion watts and above.
Some lasers like ruby lasers, only emit pulses of light which are short. Others such as liquid dye lasers or helium–neon gas lasers, emit light which is endless. NIF, like ruby laser, emits light pulses which last for billionths in one second. The laser light doesn’t require to be visible. The NIF beams begin out like the invisible infrared light which then pass to the special optics which turn them into visible green light forming then to high-energy ultraviolet, invisible light for an optimum interaction with a target.