Optical Pumping


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Optical pumping

The process of causing strong deviations from thermal equilibrium populations of selected quantized states of different energy in atomic or molecular systems by the use of optical radiation (that is, light of wavelengths in or near the visible spectrum), called the pumping radiation.

Optical pumping is vital for light amplification by stimulated emission in an important class of lasers. For example, the action of the ruby laser involves the fluorescent emission of red light by a transition from an excited level E2 to the ground level E1. In this case E2 is relatively high above El and the equilibrium population of E2 is practically zero. Amplification of the red light by laser action requires that number of atoms N2 exceed N1 (population inversion). The inversion is accomplished by intense green and violet light from an external source which excites the chromium ion in the ruby to a band of levels, E3 above E2. From E3 the ion rapidly drops without radiation to E2, in which its lifetime is relatively long for an excited state. Sufficiently intense pumping forces more luminescent ions into E2 by way of the E3 levels than remain in the ground state E1, and amplification of the red emission of the ruby by stimulated emission can then occur. See Laser

Optical Pumping

 

the excitation of the microparticles, such as atoms and molecules, that make up matter from a lower energy level to a higher level by the use of light.

optical pumping

[′äp·tə·kəl ′pəmp·iŋ]
(optics)
The process of causing strong deviations from thermal equilibrium populations of selected quantized states of different energy in atomic or molecular systems by the use of electromagnetic radiation in or near the visible region.
References in periodicals archive ?
Contract Award Notice or Call Off from Framework: The School of Physics and Astronomy require a tunable nanosecond OPO system for fluorescence spectroscopy of organic semiconductors and optical pumping of organic semiconductor lasers.
Among their topics are the xenon chemical shift and chemical shift anisotropy, principles and practices of spin-exchange optical pumping at high xenon densities and laser fluxes, biosensing and the study of biological cells using hyperpolarized 129xenon, continuous flow and dissolved phase 129xenon nuclear magnetic resonance/magnetic resonance imaging for quantifying in preclinical study as well as materials science, and hyperpolarized xenon nuclear magnetic resonance/magnetic resonance imaging signal amplification by gas extraction and remote detection.
As an alternative to electrical pumping in VCSELs, optical pumping may be used which can inject excitation carriers uniformly across a wide area [4, 6].
Besides the optical pumping of fiber lasers, direct processing of metals--welding, brazing, cutting, hardening, cladding, and coating--for use in automotive manufacturing is one of the main applications of infrared lasers with more than 1 kW of power.
Coverage overlaps with the many texts that cover laser spectroscopy and quantum optics, but this text is distinguished by discussion of topics from a variety of viewpoints and by inclusion of topics not readily available in other introductory texts such as atom optics and interferometry, optical pumping, light scattering, and sub-Doppler laser cooling.
For example, the addition of zinc oxide nanoparticles into the epoxy shows laser-like behavior upon optical pumping.
To achieve light amplification and lasing, one has to be able to realize net optical gain in an active medium by either electrical or optical pumping.
21]Ne) polarized by the same optical pumping, if some of these nuclei has the opposite sign of pseudomagnetic field in the vicinity of the p-wave resonance.
Using a technique called optical pumping (SN: 7/30/94, p.
The versatile laser system is designed for use in a broad range of applications including surgery, forensics, advanced displays, and optical pumping of Ti:Sa and dye lasers.
Contract Notice: The School of Physics and Astronomy require a tunable nanosecond OPO system for fluorescence spectroscopy of organic semiconductors and optical pumping of organic semiconductor lasers.
The topics are whether the laser could have been built more than 80 years ago, magnetic resonance and optical pumping, the maser, the laser, the first lasers, laser properties and progress in novel lasers, nonlinear optics, more exotic lasers, and the statistical properties of light.

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