Laser Laser, pronounced LAY zuhr, is a device that produces a very narrow, powerful beam of light. Some beams are thin enough to drill 200 holes on a spot as tiny as the head of a pin. The ability to focus laser light so precisely makes it extremely powerful. For example, some beams can pierce a diamond, the hardest natural substance. Others can trigger a small nuclear reaction. A laser beam also can be transmitted over long distances with no loss of power. Some beams have reached the moon. The special qualities of laser light make it ideal for a variety of applications. Some types of lasers, for example, are used to play music, read price codes, cut and weld metal, and transmit information. Lasers can also guide a missile to a target, repair damaged eyes, and produce spectacular displays of light. Still other lasers are used to align walls and ceilings in a building or to print documents. Some lasers even can detect the slightest movement of a continent. Lasers vary greatly in size. One is almost as long as a football field. Another type is as small as a grain of salt. A typical laser has three main parts. These parts are (1) an energy source, (2) a substance called an active medium, and (3) a structure enclosing the active medium known as an optical cavity. The energy source supplies an electric current, light, or other form of energy. The atoms of the active medium can absorb the energy, store it for a while, and release the energy as light. Some of this light triggers other atoms to release their energy. More light is added to the triggering light. Mirrors at the ends of the optical cavity reflect the light back into the active medium. The reflected light causes more atoms to give off light. The light grows stronger, and part of it emerges from the laser as a narrow beam. Some beams are visible. Others consist of invisible forms of radiation. There are four main kinds of lasers. They are solidstate lasers, semiconductor lasers, gas lasers, and dye lasers. In 1960, the American physicist Theodore H. Maiman built the first laser. At first, lasers had few uses, and scientists often thought of them as "a solution looking for a problem.
This cause a wide beam to focus in on a small area like when you use a piece of glass to start a fire.
Light sticks work in a similar way. When you “snap” a light stick, the chemical in the glass capsule mixes with a chemical in the plastic tube and creates light energy. Instead of the chemicals used by a firefly, other chemicals are used to create a glow. The light stick that you can buy at a store usually contains hydrogen peroxide, phenyl oxalate ester, and fluorescent dye (New York Times Company, 1 of 3). The light stick will glow the same color as the fluorescent dye placed in it. In luminescence, the chemical reaction “kicks an electron of an atom out of its ‘ground’ (lowest-energy) state into an ‘excited’ (higher-energy) state, then the electron give back the energy in the form of light so it can fall back to it’s ‘ground’ state (Fluorescent Mineral Society, 1 of 2).
The green laser is used due to its incorporation of light in murky waters is the slightest at these wavelengths. One laser is applies which creates an infrared laser. A frequency double then changes the frequency of a fraction of the beam by a aspect of two , resulting in a green light laser.
There are three major components in glow sticks. The first one is the dye, this gives the glow stick color. Next would be the two chemicals that react and make the glow stick glow. A glow stick has a glass tube within the outer tube, that is what the cracking sound is when you bend the stick. Inside this glass tube there is a substance that leaks out and reacts with the other substance in the outer tube and makes the stick glow. When these substances join together the atoms get excited, and once they come down and relax they release light. Making glow sticks took many researchers and of these were Edwin Chandross and Michael Rauhut. Edwin first started on the glow stick and then he started corresponding with Rauhut. After this, Rauhut had his team expand on Edwins research. They eventually came up with a plan that would work for making the glow stick last over a period of time. A diphenyl oxalate ester would react with hydrogen peroxide to make a bright light.
Accuracy - Improvement of accuracy has been a central topic in laser beam machining. Short pulses over a longer period of time have greater potential to obtain higher accuracies in dimensional control. This is due to the very small amounts of material that can be removed per pulse and because the very small damaged or heat effected zone at the surface. The focus on accuracy gives greater detail and reliability on the laser beam machining process
Although LASER is not a “Magic wand’’, each and every field of medicine utilizes the benefits of it and dentistry is not an exception.
lenses in a tube and made a very important discovery, the object near the end of the tube
Steel blades are not the only form that a scalpel takes. Scalpels are now in the form of lasers. The use of lasers began with a laser knife. The CO2 laser was used to remove cancerous tissue. Later the Nd:Yag laser was used.
Although telescopes has been around for several hundreds of years, there has been great discrepancy as to who invented it first. Here is one authors opinion. Lippershey was a Dutch spectacle marker during the early 17th century (approximately 1600). He was one of the first who created the "looker" (now called telescope) by placing two pieces of lenses together. The discovery that placing lenses together can magnify images were made by children who took Lippershey's spectacles and looked at a distant church tower.
Rapid generation of large area polished optical surfaces by high-power CO2 laser irradiation is shown. Results focus on glasses with high expansion coefficients (a>1025/°C) conventionally used in the optical industry. The technique involves active beam integration to obtain an intensity irradiation profile with a good uniformity over large spot sizes and is applied to preheated glass samples with initial rms roughness up to 500 nm. To find out the conditions for successful and reliable use of the proposed laser polishing method, the laser-driven heating process was monitored by means of the surface and depth temperature
In physic, a light ray or a ray of light is a narrow beam of parallel light which can be drawn as a single line a diagram. ( Referencecom, 2016) Rays are produced when light shines through a small hole which we called a point of source of light. The theory that light travels in straight lines led to the development of the light ray concept.
Refractor telescopes were first invented in 1608 by a man named Hans Lippershey. The refractor telescope was then adapted a number of times with the later version of the refractor telescope made by Johannes Kepler. This structure of Kepler’s refractor telescope is the base design of what most refractors telescopes today are made from.
As you can see lasers are a very useful and important tool which is why I have
Thomas Edison was another intelligent scientist that used the findings of Ben Franklin to invent a contraption called the light bulb. At the time of Edison?s findings, there was only gas and cand...