The laser is a device that produces a beam of light. The beam is produced by a process known as stimulated emission, and the word “laser'; is an acronym for the phrase “light amplification by stimulated emission of radiation.'; Lasers amplify light and produce coherent light beams. A light beam is coherent when its waves or photons are in step with one another.
Laser light can be made extremely intense, highly directional, and very pure in color.
BASIC PRINCIPLES
Light can be characterized both by its frequency, or number of wave crests passing a given point per second, and by its wavelength. Different wavelengths of light are seen as different colors. Like radio waves, light can also carry information. The information in the beam varies in the frequency or shape of the light wave. Because light waves are of much higher frequencies than radio waves, the have a higher information carrying capacity. In beams of light,individual photon waves are not moving along together because they are not being emitted at the same instant but instead in random short bursts. Such beams are called incoherent.
The process for laser action, was first proposed by Albert Einstein in 1917. The working principles of lasers were outlined by the American physicists Arthur Leonard Schawlow and Charles Hard Townes in their 1958 patent application. The patent was granted but was later challenged by the American physicist and engineer Gordon Gould. In 1960 the American physicist Theodore Maiman observed the first laser action in solid ruby.
HOW A LASER WORKS
A laser is made up of several basic components. One is called active medium, which consists of atoms of a gas, molecules in a liquid, ions in a crystal, or any of several other possibilities. Another component consists of some method of introducing energy into the active medium, such as a flash lamp. The third basic component is a pair of mirrors placed on either side of the active meduim, one of which transmits part of the radiation that strikes it. Atoms initially in a lower state are raised to the upper state by energy from a flash lamp or some other pumping source. Some of these atoms emit light in random directions. Light traveling vertical to the mirrors stays within the active medium long enough to stimulate emission from other atoms. Light traveling in other directions are soon lost. Some light reaching the output mirror is transmitted to form the laser beam, some is reflected back through the medium to continue the stimulated-emission process.
I did not participate in the snap challenge because I am on the university’s meal plan. However, I still participated in the snap challenge process and afterwards I came to the following conclusions. The grocery list was very challenging; I decided to shop for my food online instead of going to the grocery store. My first resource was Walmart, but they did not have the prices for many foods. It was then that I started to realize my monies were depleting quickly. Throughout this assignment I realized that dollars add up and purchasing the store brand items are not always the cheaper way. I thought about which grocery stores provide the pickup option and I chose Lowes Foods. When I finished my list I realized that I forgot to calculate tax, as
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).
Laser is an acronym used for Light Amplification by Stimulated Emission of Radiation. Laser treatment is a procedure used to cure skin problems with a strong beam of light. Experienced cosmetologists and dermatologists use this new technology to cure many ailments.
Leadership is a complex process with many different approaches. This is a summary of the leadership literature including the pros and cons of each approach. The trait approach implies successful leaders are born with those traits. This theory focuses on identifying certain traits that make people great leaders. Some of the major leadership traits identified in the trait approach are intelligence, self-confidence, determination, integrity, and social ability. There are many advantages to the trait approach. “First, it is intuitively appealing because it fits clearly into the popular idea that leaders are special people who are out front, leading ...
Although LASER is not a “Magic wand’’, each and every field of medicine utilizes the benefits of it and dentistry is not an exception.
The Chinese usually celebrate the New Year in a period of 15 days. On the first day, the New Year is celebrated and the gods of heaven and earth are welcomed by the people. On the second day, the people pray to their ancestors and to the gods for good fortune in the coming year. During the third day, the Chinese stay inside the house, believing that it is unlucky to be outdoors. On the fourth day, Chinese families clean their homes, throw...
Adaptive leadership is primarily an active process of adaptation, during which the leader does not take just a passive effort to adapt to circumstances in which he found himself. The leader should be able to change those circumstances in order to carry out tasks.
Lasers were a remarkable technical breakthrough. Electronic engineer Theodore Maiman invented the first optical ruby laser. Initially, surgeries with lasers were introduced to prevent blindness caused by diabetic retinopathy. Later, in 1964, another electronic engineer Kumar Patel discovered the carbon dioxide laser (CO2). The CO2 laser has been used widely to treat some types o...
When you’re in Chinatown on Chinese New Year, you can hear the firecrackers popping followed by the loud music of banging drums and cymbals clashing in beat with each other. Then as the smoke clears, a huge beast emerges from the smoke. Kids hide behind their parents as the beast shakes its head from side to side and begins to dance around. It is a frightening beast, but it scares the evil spirits and brings good luck to all the stores around Chinatown. As some people know from this description, this is Lion Dancing – a mixture of dance and martial arts. The legendary story of how Lion Dancing began takes place in a cave where the lions were sleeping. A monk enters and prepares a shrine around the cave. When he is finished, the monk wakes the sleepy lions by playing on the drum and gong. He wants the sleepy lions to bow to the shrine he has created, but the lions only want to dance around and have fun. So the monk takes some lettuce greens to poke fun at the lions and get their attention. This makes the lions so mad that they eat the greens. Nowadays, Lion Dancers throw lettuce at the audience in order to spread good luck around because the greens represent wealth.
A person’s title within the organization does not make them a leader. The driving factor which determines if someone is in a leader position is their behavior. This person who is a leader will guide those in the organization by influencing, guiding, giving direction, and opinions (Marquis & Huston, 2012). The culture as well as the climate of an organization begins with the leadership (Azaare & Gross, 2011). Each individual person has their own leadership style. Knowing one’s own leadership style will help them understand themselves and be able to grow as a leader. The purpose of this paper is to look at my own leadership style, including my strengths for leading others. A description of a potential challenge that I foresee due to my leadership style and a plan for my personal leadership development will be discussed.
China is a country full of ancient customs and traditions. The native people are very proud of these customs and traditions. To many of us hearing the word ‘China’ we conjure up thoughts of origami, dragons, pandas, and their distinctive script’ all of which are traditional to china, but it goes a lot deeper than that.
The Yulin festival shines a light on a changing Chinese culture. What is happening on the small scale depicts the reality of what is happening on the large scale. China is changing, and one of the most vivid examples of this change is how Chinese treat dogs. In 1980, Keeping dogs as pets was banned because having dog as pets was considered as bourgeois affectation (Peter). Also, because the government thought people should focus on improving their own lives instead of raising dogs and because raising dogs weren’t part of their culture because dogs used to be guards, herders or meals than companions. Moreover, keeping dogs as pet would cost a lot of money. However, Chinese restrictions were loosened in the 1990s and early 2000. In 2003 Chinese were allowed to own dogs (Peter).
states strikes an excited atom, the atom is stimulated, as it falls back to a
In the beginning of lion dancing only men were allowed to do the dance. However, since the early 20th century that have changed and female were allowed to do lion dancing as well. There are two-difference type of lion dancing which includes the Northern lion and
Light is a series of self-propagating transverse waves composed of electric and magnetic fields in a fixed ratio. The distance between the crests of successive waves is known as the wavelength, denoted by the symbol λ (lambda), as shown in Figure 2. The frequency of a wave is defined as the number of waves passing through a given point per second.