LASER is an acronym for Light Amplification by the Stimulated Emission of .
The concept consists of an excited state atom encountering a photon of the .
same energy that corresponds to the DE between the excited and ground states of the .
atom. When such a photon is encountered, it causes the emission of another photon of the .
same energy. Albert Einstein first suggested this phenomenon in a 1916 paper proving .
Plank's law of radiation. The idea but it was considered odd and the event of photon .
interaction with an excited state atom rare. Only much later did scientists begin to create .
inverted populations with more atoms in the excited state than the ground state so that .
absorption would not dominate the process and stimulated emission could occur.
In 1954, Charles Townes and Arthur Schawlow invented the microwave .
amplification by stimulated emission of radiation by using ammonia gas and microwave .
radiation - the maser was invented before the optical laser. The technology is very close .
but does not use a visible light. .
In 1958, Charles Townes and Arthur Schawlow thought about a visible laser, an .
invention that would use infrared or visible spectrum light. .
Theodore Maiman invented the ruby laser thought to be the first successful .
optical or light laser. Many people claim that Theodore Maiman invented the first .
optical laser but there is some controversy that Gordon Gould was the first. .
Gordon Gould was the first person to use the word "laser". There is many reason to .
believe that Gordon Gould did made the first light laser. Gould was a very smart student .
at Columbia University under Charles Townes The inventor of the maser. Gordon Gould .
was inspired to build his optical laser starting in 1958. He failed to file for a patent his invention until 1959. As a result Gordon Gould's patent was refused and his technolgy .
was copyed by others. It took until 1977 for Gordon Gould to finally win his patent war .
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Theodore Maiman invented the ruby laser thought to be the first successful optical or light laser. ... They developed laser beam weapons and high powered lasers. ... One of the most helpful ways lasers are used to is laser eye surgery. ... It is hard to believe that lasers have come so far. ... It is hard to say were lasers will go next but I am sure that lasers are around to stay. ...
There are many different kinds of lasers that have a large array of powers starting from the most powerful; an atomic laser to the weakest; an infrared laser. ... An infrared laser emits about two volts per second. The way these two lasers work are remotely relative, but I am going to explain the basic way most lasers work. ... The argon gas is what gives a laser its red color in a laser pointer. ... There are many ways to change the strength of a laser but what I have explained above are the basics to a laser and the way it works. ...
Introduction to lasers and different types of lasers Light is a form of energy that can be released by an atom. ... The difference between gas and ruby lasers is that most gas lasers operate continuously. ... Also laser range finders for aircrafts use laser distance meters Laser used for automatic landing systems for aircrafts. ... Laser surface treatments such as laser cladding, surface alloying & cleaning. ... Laser welding, including conduction-limited laser welding and sensor integration. ...
In the recent years medical technology has offered a great alternative for people like him, laser surgery. ... From all of his sailing investments, he considers laser eye surgery one of the best. ... Moshirfar talks about the risks of laser eye surgery for patients with high myopia and flat corneas. ... His information can help this group of patients decide between laser surgery and contact lenses. ... It should cover exams and medicines as well as the surgeon's fee and the laser royalty. ...
Laser Printers Vs Inkjet Printers Subject: Laser Printers Vs Inkjet Printer Introductory Summary This report explains the advantages of the Laser printer over the Inkjet printer. ... Laser printers last longer and cost less over extend use. ... Advantages of Laser Printers over Inkjet Printers Laser printers have advantages over the inkjet printers. ... Most Laser printers come with network connectivity ports that can be connected to a LAN. ... Features of Laser Printers over Inkjet Printers Many laser printers exist with different feature so I picked the mid class Xerox P...
The laser is one of the most significat inventions of the 20th century. ... This type of laser, called the He-Ne Laser was used for reading UPC product codes and surveying equipment. Lasers before the He-Ne laser were only able to discharge large 'blasts', this was the first laser able to produce a continuous stream. ... Today we have many uses for the laser. ... Lasers are also extremely beneficial for surgury. ...
Laser Design A laser usually consists of a gain medium. ... Other types of gas lasers are Argon-ion lasers, neon-copper lasers and helium-silver lasers. ... Other types of lasers include fiber lasers, photonic crystal lasers, semiconductor lasers, dye lasers, exotic media and free electron lasers. Uses of Lasers As there are many types of lasers, lasers have many uses in various sectors. ... In research, laser annealing, laser interferometry, laser scattering and spectroscopy. ...
Common hand held scanning technologies includes wands, lasers, and CCDs. ... Hand held laser scanners use a laser diode to create a scan line by projecting a beam of energy off a rotating prism or oscillating mirror. ... The light generating medium in first-generation moving beam laser installations was a Helium-Neon laser tube. In the past few years semiconductors capable of producing laser light have been incorporated in most laser products. ... Compared to the gas tube used to create Helium- Neon lasers, the laser diode is much smaller, requires significantly less power, and is more durab...
