A report on Laser
Device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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Maser
14 linksDevice that produces coherent electromagnetic waves through amplification by stimulated emission.
Device that produces coherent electromagnetic waves through amplification by stimulated emission.
The laser works by the same principle as the maser but produces higher frequency coherent radiation at visible wavelengths.
Optical amplifier
9 linksDevice that amplifies an optical signal directly, without the need to first convert it to an electrical signal.
Device that amplifies an optical signal directly, without the need to first convert it to an electrical signal.
An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed.
Stimulated emission
10 linksProcess by which an incoming photon of a specific frequency can interact with an excited atomic electron , causing it to drop to a lower energy level.
Process by which an incoming photon of a specific frequency can interact with an excited atomic electron , causing it to drop to a lower energy level.
Such a gain medium, along with an optical resonator, is at the heart of a laser or maser.
Optical cavity
9 linksArrangement of mirrors that forms a standing wave cavity resonator for light waves.
Arrangement of mirrors that forms a standing wave cavity resonator for light waves.
Optical cavities are a major component of lasers, surrounding the gain medium and providing feedback of the laser light.
Photon
8 linksElementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.
Elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.
The photon concept has led to momentous advances in experimental and theoretical physics, including lasers, Bose–Einstein condensation, quantum field theory, and the probabilistic interpretation of quantum mechanics.
Laser pumping
7 linksLaser pumping is the act of energy transfer from an external source into the gain medium of a laser.
Population inversion
8 linksIn science, specifically statistical mechanics, a population inversion occurs while a system (such as a group of atoms or molecules) exists in a state in which more members of the system are in higher, excited states than in lower, unexcited energy states.
In science, specifically statistical mechanics, a population inversion occurs while a system (such as a group of atoms or molecules) exists in a state in which more members of the system are in higher, excited states than in lower, unexcited energy states.
This concept is of fundamental importance in laser science because the production of a population inversion is a necessary step in the workings of a standard laser.
Light
8 linksElectromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.
Electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.
Emission can also be stimulated, as in a laser or a microwave maser.
Active laser medium
6 linksThe active laser medium (also called gain medium or lasing medium) is the source of optical gain within a laser.
Charles H. Townes
5 linksAmerican physicist.
American physicist.
Townes worked on the theory and application of the maser, for which he obtained the fundamental patent, and other work in quantum electronics associated with both maser and laser devices.