and how was is discovered ? and what is it used in ? tell me everything u know about it plz !!!
2006-06-19 17:02:52 · 25 answers · asked by haysam79 1 in Science & Mathematics ➔ Physics
A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The verb to lase means "to produce coherent light" or possibly "to apply laser light to", and is a back-formation of the term laser.
Laser light is typically near-monochromatic, i.e. consisting of a single wavelength or color, and emitted in a narrow beam. This is in contrast to common light sources, such as the incandescent light bulb, which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths.
Laser action is explained by the theories of quantum mechanics and thermodynamics. Many materials have been found to have the required characteristics to form the laser gain medium needed to power a laser, and these have led to the invention of many types of lasers with different characteristics suitable for different applications.
The laser was proposed as a variation of the maser principle in the late 1950s, and the first laser was demonstrated in 1960. Since that time, laser manufacturing has become a multi-billion dollar industry, and the laser has found applications in fields including science, industry, medicine, and consumer electronics.
2006-06-19 17:06:30 · answer #1 · answered by David d 2 · 1⤊ 0⤋
Laser is an acronym for Light Amplification by Stimulated Emission. In an active medium[a substance that can can emit photons if excited]with a population inversion[more excited molecules than ground state molecules], a photon of the same wavelength as the one about to be released can trigger the emission of a photon from the exited molecule. The photon released will be of the same wavelength and travel in the same direction as the stimulating photon. They will also be in Phase. If you place a good mirror at one end of the cavity containing the Active Medium and a partially reflecting mirror at the other end, you have an optical cavity. Then if we add a method of excitation, there will be photons emitted. Some of these will be collinear with the optical axis. After a few passes the beam will be very powerful and all in the same direction, of the same wavelength, and in phase. This is called Coherent Light.
2006-06-20 00:27:52 · answer #2 · answered by David C 1 · 0⤊ 0⤋
Light Amplification by Stimulated Emission of Radiation
2006-06-20 01:15:05 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Light Amplification by Stimulated Emission of Radiation.
2006-06-20 00:13:17 · answer #4 · answered by rajeev@iitd 3 · 0⤊ 0⤋
Light Amplification by Stimulated Emission of Radiation.
2006-06-20 00:12:29 · answer #5 · answered by balla3baby3 1 · 0⤊ 0⤋
Light Amplification by Stimulated Emission of Radiation
2006-06-20 00:10:40 · answer #6 · answered by Master Quark 3 · 0⤊ 0⤋
A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The verb to lase means "to produce coherent light" or possibly "to apply laser light to", and is a back-formation of the term laser.
Laser light is typically near-monochromatic, i.e. consisting of a single wavelength or color, and emitted in a narrow beam. This is in contrast to common light sources, such as the incandescent light bulb, which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths.
Laser action is explained by the theories of quantum mechanics and thermodynamics. Many materials have been found to have the required characteristics to form the laser gain medium needed to power a laser, and these have led to the invention of many types of lasers with different characteristics suitable for different applications.
The laser was proposed as a variation of the maser principle in the late 1950s, and the first laser was demonstrated in 1960. Since that time, laser manufacturing has become a multi-billion dollar industry, and the laser has found applications in fields including science, industry, medicine, and consumer electronics.
2006-06-21 09:15:07 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Light Amplification by Stimulated Emission of Radiation
2006-06-20 00:07:35 · answer #8 · answered by chelema4 1 · 0⤊ 0⤋
Laser, a device that produces and amplifies light.
The word laser is an acronym for
Light Amplification by Stimulated Emission of Radiation.
Laser light is very pure in color, can be extremely intense, and can be directed with great accuracy. Lasers are used in many modern technological devices including bar code readers, compact disc (CD) players, and laser printers. Lasers can generate light beyond the range visible to the human eye, from the infrared through the X-ray range. Masers are similar devices that produce and amplify microwaves.
2006-06-20 00:08:58 · answer #9 · answered by Great Advisor 2 · 0⤊ 0⤋
A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The verb to lase means "to produce coherent light" or possibly "to apply laser light to", and is a back-formation of the term laser
2006-06-20 00:11:57 · answer #10 · answered by egymah 4 · 0⤊ 0⤋