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A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The back-formed verb to lase means "to produce laser light" or possibly "to apply laser light to".
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.
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Bi-Hamiltonian structures for integrable systems on regular time scales
Blazej M. Szablikowski, Maciej Blaszak, and Burcu Silindir A construction of the bi-Hamiltonian structures for integrable systems on regular time scales is presented. The trace functional on an algebra of delta-pseudodifferential operators, valid on an arbitrary regular time scale, is introduced. The linear Poisson tensors and the related Hamiltonians are d ... [J. Math. Phys. 50, 073502 (2009)] published Thu Jul 2, 2009.
Hill's equation with random forcing parameters: The limit of delta function barriers
Fred C. Adams and Anthony M. Bloch This paper considers random Hill's equations in the limit where the periodic forcing function becomes a Dirac delta function. For this class of equations, the forcing strength q, the oscillation frequency lambda, and the period (Deltatau) are allowed to vary from cycle to cycle. Such equations arise ... [J. Math. Phys. 50, 073501 (2009)] published Thu Jul 2, 2009.
Quasiperiodic solutions for the cubic complex GinzburgLandau equation
Hongzi Cong, Jianjun Liu, and Xiaoping Yuan The existence of two-dimensional KolmogorovArnoldMoser invariant tori is proved for cubic complex GinzburgLandau equation of higher spatial dimension. As a consequence, the equation possesses a Cantorian branch of nontraveling-wave quasiperiodic solutions of two-dimensional frequency vector. ... [J. Math. Phys. 50, 063516 (2009)] published Tue Jun 30, 2009.
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Argon Gas Laser System - The argon laser was invented in 1964 by William Bridges at Hughes Aircraft and is one of a family of ion lasers that use a noble gas as the active medium. This laser is used in many applications.
Meta Description: [ The Argon laser was invented in 1964 by William Bridges at Hughes Aircraft and is one of a family of Ion lasers that use a noble gas as the active medium. ]
Don K's Laser Page - So you want a working diode laser? Gives information on laser diode pointers.
How a Laser Works - A tutorial from Livermore National Labs.
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Introduction to Lidar - An introduction to atmospheric lidar for high school students. Lidar can be considered like radar but using light instead of radio waves.
Meta Description: [ a introduction to atmospheric lidarfor high school students ]
Laser Tutorial - Basic explanation of the operation of a laser.
Meta Description: [ An illustrated five part tutorial that describes how lasers work. ]
Lasers - FAQ-like text covering the safe operation and creation of homemade lasers.
Schawlow and Townes Invent the Laser - Bell labs tells the history of the invention and evolution of the LASER at Bell Labs: 1958 - 1998.
The Invention of the Laser at Bell Labs, 1958 - 1998 - Laser history, written by the lab where it happened.
The Laser Adventure - [Windows-based computer preferred for best viewing experience.] In English and Hebrew. A course on Lasers and their Applications developed by Rami Arieli for grades 11-12 and college level.
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What You Should Know When Buying a Laser Pointer - Basic types of laser pointers, their operation and safe use.
Meta Description: [ Blue Laser Diode Modules, Retail and Wholesale, 473 nm, 5 - 100 mW ]
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