### device:

Laser
* Always wear goggles that protect against the specific wavelength of the laser.
* Every laser has what is termed a coherence length.
* Many lasers emit invisible ultraviolet or infrared radiation
  - operate in an invisible spectrum
  - use high voltage and high current electrical power
* Most lasers are capable of causing eye injury to anyone who looks directly into the beam
  - less harmful than sunlight
  - come in only one color
  - create beams
* Most lasers emit beams
  - visible light
* Most lasers have applications
  - brightness
  - high voltages associated with their power supplies
  - output
  - peak brightness
  - scientific applications
  - involve high voltages, toxic chemicals, high vacuum, laser radiation and other hazards
  - make beams
* Most lasers produce beams
  - ultraviolet light
  - remove only certain colors
* Most lasers use energy
  - work at a fixed frequency
* Most lasers work by producing an intense beam of light that can cut or vaporize skin tissue
  - using light to generate heat, which then destroys the surrounding hair follicle
* Some lasers are better than others for reducing scar tissue
  - billions of times more powerful than a light bulb
* Some lasers are so bright that they can cause harm even at far distances
  - strong, they can cut through sheets of steel
* Some lasers can produce hundreds of thousands of pulses per second
  - reduce bleeding by coagulating blood vessels as they cut tissue
* Some lasers emit invisible light, in the UV, or more commonly, in the IR regions
* Some lasers employ flowing gas systems
  - potentially hazardous cryogenic fluid for cooling purposes
* Some lasers have power
  - radiant power
  - present a potential for skin damage
* Some lasers produce beams at various wavelengths
  - linearly polarized light
  - send out a continuous beam
* Some lasers use a broad beam that ensures that the corrective zone is even and smooth
  - chemical dyes and solvents
* activate the stains and measure cell size, number and viability.
* allow for easy reading of bar codes on imperfect surfaces or through glass
  - light wave communications
* also are very expensive and lose power in their fiberoptic cables
  - have a fixed excitation wavelength
  - stimulate collagen and elastin contraction and contribute to new collagen formation
* are a good light source because they can provide a bright, narrow, stable beam
  - relatively new tool for dentists that can be used in many ways
* are a special kind of light
  - source of light made up of only one color
  - able to cut teeth in saws
  - acronyms
* are also faster, in general, than inkjets
  - reliable and very accurate tools for determining distances to satellites in orbit
  - under consideration for beaming the energy from space
* are also very expensive and lose power in their fiberoptic cables
  - to sail and own
* are an important advance in medicine and surgery
  - indispensable part of our everyday life
* are another application of optics
  - method of breaking up the nucleus of the cataract
  - attractive because of their higher data rates and smaller beam divergence angles
  - beams of light produced by electrically stimulating particular materials
  - capable of causing eye damage
  - characterized according to their wavelength in a vacuum
  - commonplace for today s ophthalmologists, dermatologists and cosmetic surgeons
* are devices for producing very intense beams of light of a single color
  - the creation and amplification of a narrow, intense beam of coherent light
* are devices that emit certain wavelengths of light
  - produce light at very specific frequencies of the electromagnetic spectrum
  - distinguished from other light sources by their coherence
  - effective in removing, vaporizing, and breaking down tissues
  - everywhere
  - expensive and delicate
  - intense sources of light
  - just amplified light that is concentrated and aimed using different components
* are located in bombs
  - cd players
  - hospitals
  - laboratories
  - machines that make incredible beams of light
  - made of photons
  - models of meticulous manufacturing processes and precision alignment
  - monochromatic, collimated and coherent
* are of many types and serve many purposes
  - military usefulness by all nations for range finding, target designation and tracking
* are optical devices which produce intense coherent beams of light
  - part of optical mouses
  - particularly useful in treating small ares of veins of the face and legs
  - possible because light interacts with electrons in a certain way
* are possible because of another type of photon emission called stimulated emission
  - the way light interacts with the electrons
  - precise instruments used for the shaping, removal, and treatment of soft tissue
  - simply one aspect of computer technology
  - sometimes useful as light sources in optical microscopy
  - still much faster especially if they have their own processor and memory
* are the answer to many, many things in science
  - most technologically advanced means available to correct certain vision problems
  - product of research and development in electrical engineering
  - source of such light
  - tool of tools
  - treatment of choice for small spider veins
  - wave of the future in all types of surgery and urology is no exception
* are used for accuracy
  - cuts
  - eye surgery
  - fiber optics
  - fun
  - laser printers
  - light effects
  - measuring
  - pointings
* are very energy intensive, consuming much more energy than they produce
  - sensitive to being overdriven
  - specific in regard to the wavelength produced
  - unique light sources with several interesting properties
* can also cut tissue and cauterize the tissue without damaging other tissue around it
  - melt things
  - present a serious danger to the eyes and skin
  - produce a very narrow beam that diverges little
  - prove to create more problems in surgical procedures than they correct
  - record and reproduce music on compact discs
  - remove unwanted hair
* can be dangerous, especially when at the prime focus of a telescope mirror
  - painful, but it depends on the sensitivity of the person being treated
  - so monochromatic that a small shift in the light frequency can be detected
  - cause temporary blindness
* can cut and cauterize at the same time with lesser degrees of power
  - at high speeds
  - exhibit chaotic fluctuations
  - greatly diminish some scars by instantly vaporizing the outer layers of skin
  - guide gigantic machines that bore tunnels in hard rock
* can help minimize blood vessels
  - remove facial wrinkles and lines
  - identify and measure phenomena that are undetectable by the human eye
  - mean a new way of life for someone born with a birthmark
  - measure unimaginably small things and incredibly brief events
  - penetrate fog to twice the distance the human eye can see
  - play a key role in creating three-dimensional microstructures
  - present a variety of potentially serious hazards
* can produce discreet codes that are only visible to the trained eye
  - very tightly focused pulses of light and they can do it many times a second
  - provide very intense beams of radiation
* can remove scars, birthmarks, and tattoos
  - tissue painlessly with no bleeding
  - restore or stabilize vision and prevent severe loss of vision in many situations
  - take things down to the wavelengths of light
* can target stain molecules without harming the inside of the tooth
  - the pulp
  - temporarily blind pilots during critical phases of flight and jeopardize safety
  - vaporize fibroid tumors, remove ectopic pregnancies and open blocked fallopian tubes
* cause a large number of photons to have identical energy and direction
  - damage because they focus large amounts of light energy on a small surface area
* causes burns on the retina.
* cladding and glazing enhance the materials properties of steels.
* come in infrared and visible varieties, but none yet in the x-ray band.
* consist of four components
  - several components
* contain a material that produces and amplifies light.
* containing thulium are used in satellites that take pictures of the Earth's surface.
* continue to revolutionise spectroscopy.
  - the high-current electron beam
* deliver a type of light energy
  - energy in the form of light
  - sharper text at a given resolution than inkjets of the same resolution
* destroy only the target, leaving the surrounding healthy tissues intact.
* differ in many ways, but there are certain characteristics which all lasers have in common.
* direct concentrated light energy toward a specific target.
* do make surgery less intrusive.
* emit a beam of light, which is absorbed by the pigment found in the hair shaft and follicle
  - narrow and very intense beam of light or other radiation
  - intense heat at close range
* emit narrow, intense beams of light or other radiation
* emits beam of light.
* excites fluorescence emission from within labeled sample.
* fights brain clots and detects breast cancer.
* finely focused beam of light that vaporizes tissue and turns water in the cells to steam.
* flash and burn and prod at the mysteries of the universe.
* focus a beam of light.
* generate coherent light, ie light comprising photons with the same wavelength and in-phase
  - very pure frequencies or colours of light
* generate, amplify, and distribute the light down hairlike fibers.
* give clearer underwater images than video.
* have a prominent position in dermatology and cosmetic surgery
  - diverse uses and have revolutionized differenct areas of life
* have many applications and are becoming more widely used in medicine and dentistry
  - helpful uses in medicine
  - industrial, commercial and medical applications
  - more power than LEDs, but vary more with changes in temperature and are more expensive
  - oscillating mirrors that are subject to wear and mechanical failure
  - vast applications
* help shrink uterine fibroid tumors.
* includes sections.
* is also non-invasive, so there is no risk of infection by poor sterilization procedures
  - always a quick cure for all eye diseases
* is an acronym for l ight a mplification by s timulated e mission of r adiation
  - light amplification by the stimulated emission of radiation
  - of 'Light Amplification by Stimulated Emission of Radiation'
  - effective way to deliver concentrated cold light to the tumor bed
  - another acronym used commonly in medicine
  - associated with a prolonged tissue-sloughing period
  - dangerous to the eyes
  - one of many therapeutic applications of flexible endoscopes
* is the most modern method of therapy
  - recent surgical procedure, using the laser beam to reshape the cornea
* is used at very close range
  - to seal leaks or destroy abnormal blood vessels growing under the macula
  - very valuable in the treatment of superficial tongue and laryngeal lesions
  - it possible to create holograms, or three-dimensional images
* now have many uses in industry and medicine.
* offer new ways to investigate and manipulate cells
  - precision and control
* only helps with the superficial component of the hemangioma.
* operate in the visible, infrared, or ultraviolet regions of the spectrum.
* present many safety threats, but the most common threat is damage to the eyes.
* produce a beam of photons all in the same state
  - light unique in nature
  - light, just as an incandescent light bulb does
  - only a single wavelength of light and are limited in what they can treat
* range in power from a few microwatts to several billion watts in short bursts.
* reduce surgical procedures to short outpatient visits.
* remove tattoos by vaporizing the pigment colors with a high-intensity light beam.
* resurfacing A laser vaporizes the thin, damaged outer layer of skin.
* scan vessel linings almost daily to develop an ongoing record of lining wear.
* score at high speeds.
* send electricity through a tube of gas.
* shoot visible beams, missles cruise along, and so forth.
* shortened term for light amplification by stimulated emission of radiation.
* slit at high speeds.
* sound like lasers, bombs sound like bombs, and swords sound like swords.
* stands for 'light amplification by stimulated emission of radiation'
* use a laser to illuminate the film and photomultiplier as detectors
  - light energy to cut, coagulate and vaporise tissue
  - mirrors to build up a strong beam of light
* utilize different methods to control the beam that reshapes the cornea.
* vary in their use according to their wave length.
* very bright light that is used in the treatment of eye disorders.
* work best on materials such as carbon steel or stainless steels.
* work by emitting a powerful beam of light, which causes a superficial burn of the skin
  - light at various wavelengths
  - producing an intense beam of bright light that travels in one direction
  - differently depending on what they're needed for
  - to selectively remove the pigment containing cells of each lesion