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Qwertyui EssayPROPERTIES OF LASERFirst, lets discuss the properties of optical maser light and then we impart go into how is is created. optical maser light is monochromatic, directional, and coherent. MonochromaticThe light emitted from a laser is monochromatic, that is, it is of one wavelength (color). In contrast, ordinary ashen light is a combination of many different wavelengths (colors). DirectionalLasers emit light that is highly directional. Laser light is emitted as a relatively narrow beam in a specific direction. ordinary light, such as coming from the sun, a light bulb, or a candle, is emitted in many directions past from the source. CoherentThe light from a laser is said to be coherent, which means the wavelengths of the laser light argon in phase in space and time.These three properties of laser light are what make it much of a hazard than ordinary light. Laser light can deposit a great spile of energy within a very small area as James Bond well-nigh found out in GoldfingerBENEFITS OF LASERNuclear fusionSome of the worlds closely powerful and manifold arrangements of multiple lasers and optical amplifiers are apply to produce passing high intensity pulses of light of extremely short duration. These pulses are arranged such that they impact pellets of tritium-deuterium simultaneously from all directions, hoping that the squeezing effect of the impacts will induce atomic fusion in the pellets. This technique, known as inertial confinement fusion, so utmost has not been able to achieve breakeven, that is, so far the fusion reaction generates less power than is apply to power the lasers, but researchcontinues. MicroscopyConfocal laser scanning microscopy and Two-photon excitation microscopy make use of lasers to obtain blur-free images of fatheaded specimens at various depths. Laser capture microdissection use lasers to procure specific cell populations from a waver section under microscopic visualization. Additional laser microsc opy techniques include harmonic microscopy, four-wave mixing microscopy and interferometric microscopy. soldiersMilitary uses of lasers include applications such as target designation and ranging, defensive countermeasures, communications and directed energy mechanisms. nowadays as an energy ordnanceDirected energy weapons are being developed, such as Boeings Airborne Laser which was constructed inside a Boeing 747. Designated the YAL-1, it is intended to kill short- and intermediate-range ballistic missiles in their boost phase. defensive countermeasuresDefensive countermeasure applications can range from compact, low power infrared countermeasures to high power, airborne laser frames. IR countermeasure systems use lasers to confuse the seeker heads on heat-seeking anti-aircraft missiles. High power boost-phase intercept laser systems use a complex system of lasers to find, track and terminate intercontinental ballistic missiles (ICBM). In this type of system a chemical laser, one in which the laser operation is powered by an energetic chemical reaction, is used as the main weapon beam (see Airborne Laser). The Mobile Tactical High-Energy Laser (MTHEL) is some other defensive laser system under development this is envisioned as a field-deployable weapon system able to track incoming artilleryprojectiles and cruise missiles by radar and destroy them with a powerful deuterium fluoride laser. Another example of direct use of a laser as a defensive weapon was researched for the Strategic Defense Initiative (SDI, nicknamed Star Wars), and its successor programs.This project would use ground-based orspace-based laser systems to destroy incoming intercontinental ballistic missiles (ICBMs). The practical problems of using and aiming these systems were many particularly the problem of destroying ICBMs at the most opportune moment, the boost phase just after launch. This would involve directing a laser finished a large distance in the atmosphere, which, due to o ptical scattering and refraction, would bend and distort the laser beam, complicating the aiming of the laser and reducing its efficiency. Another idea from the SDI project was the nuclear-pumped roentgenogram laser. This was essentially an orbiting atomic bomb, surrounded by laser media in the form of glass rods when the bomb exploded, the rods would be bombarded with highly-energetic gamma-ray photons, causing spontaneous and stimulated waiver of X-ray photons in the atoms making up the rods. This would lead to optical amplification of the X-ray photons, producing an X-ray laser beam that would be minimally affected by atmospheric distortion and capable of destroying ICBMs in flight. The X-ray laser would be a strictly one-shot device, destroying itself on activation. Some initial tests of this concept were performed with underground nuclear testing however, the results were not encouraging. Research into this approach to missile defense was discontinued after the SDI program was cancelled. disorientationSome weapons simply use a laser to disorient a person. One such weapon is the Thales Green Laser Optical Warner.Medical* Cosmetic surgery (removing tattoos, scars, stretch marks, sunspots, wrinkles, birthmarks, and sensory hairs) see laser hair removal. Laser types used indermatology include ruby (694 nm), alexandrite (755 nm), pulsed diode array (810 nm), NdYAG (1064 nm), HoYAG (2090 nm), and ErYAG (2940 nm). * warmness surgery and refractive surgery* Soft tissue surgery CO2, ErYAG laser* Laser scalpel (General surgery, gynecological, urology, laparoscopic) * Photobiomodulation (i.e. laser therapy)* No-Touch removal of tumors, especially of the brain and spinal cord. * In dentistry for caries removal, endodontic/periodontic procedures, toothwhitening, and literal surgery