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 ?
The subject of the order is the delivery of an ultra-stable, tunable and single-mode titanium-sapphire continuous continuous laser with a narrow spectral line together with a dedicated optical pump for the department of experimental physics at the wroclaw university of technology.
In this study, we performed the simultaneous excitation of five QD samples using the third harmonic of an Nd:YAG laser as the optical pump source.
Unlike conventional passive photonic band-gap, when excitons in quantum wells with Bragg frequency are affected by strong optical pump pulse at a frequency close to the frequency of exciton, it is expected that the position and width of photonic band-gap modulated through the Stark effect and the reflectivity to not be in resonance with the exciton anymore.
This technique is way more precise than the process currently used to modify the quantum properties of individual photons - forcing a photon to interact with a very strong optical pump beam and hoping that doing so would create the modification one is looking for.
By applying an optical pump pulse, they have excited an electron in one of the dots, which can in turn tunnel to the second one, as controlled by external voltage [25].
Then its resistivity is linearly decreased with respect to the received optical energy amount which guaranties a perfect synchronization between the optical pump command and the electrical released output pulse [3, 4].
The optical pump power is combined inside the fiber core by a dichroic coupler, the wavelength multiplexer.
Tenders are invited for a high energy per pulse fs laser source emitting at two wavelengths to be used as an optical pump source for the characterization of ase and optically pumped lasing from colloidal quantum dots.
An optical pump probe technique was used to probe signals and the ultrahigh optical gain with gain coefficient exceeding 6755 [cm.sup.-1] was achieved.
Such a design allows increased freedom in the placement of the optical pump and simplifies the requirements for external optics.
To maximize the gain and dynamic range of the external modulation link, large optical pump power at [lambda] = 1.3 [micrometer] was obtained from a single-mode fiber-pigtailed Nd:YAG laser source.
All the high frequency signals are contained entirely between the optical pump and probe points and no other microwave sources or detectors are needed.