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Showing 1 to 20 of 51 for “"Optical pumping."”.
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Shaped ultrafast optical pumping for NMR applications
Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2002.
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Optical Pumping of Rubidium Spin in a Solid Argon Matrix
… at 799 nm, 785 nm, and 747 nm, and investigated optical pumping of the implanted rubidium atoms. We observed that the absorption spectrum of the rubidium could be modified by incident laser light. This modification could be reversed by applying an additional light source. In addition, we were …
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Optical Pumping of Dye Lasers Using an Array of Plasma Pinches
A new optical pumping source consisting of an array of plasma pinches is employed to pump, for the first time, a variety of dye lasers. The plasma pinch is formed in a hollow cylindrical shape by electrically discharging a high-energy capacitor bank ((TURN)14 kJ) through a device containing a few …
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Clinical-Scale Hyperpolarization of 129Xe and 131Xe via Stopped-Flow Spin Exchange Optical Pumping
The fundamental physics of spin-exchange optical pumping (SEOP) has been explained in detail by many brilliant scientists since its discovery in the 50’s and 60’s. Although some interactions remain only tenuously understood, mathematical relationships have been mapped across many trajectories with …
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Luminescent Characteristics Study of a Mather-Type Dense Plasma Focus and Application to Laser Optical Pumping
… for the first time, the MDPF is utilized as an optical pump source for lasers. The main MDPF radiation output is a continuum emission created by intense high-energy electron bombardment of the beam-target material in the top of the center electrode. For a high atomic weight beam-target material, …
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SPECTROSCOPIC STUDIES OF NUCLEAR SPINS POLARIZED VIA SPIN EXCHANGE OPTICAL PUMPING AND DYNAMIC COUPLING IN CRYPTOPHANE HOST-GUEST COMPLEXES
… conventional NMR/MRI can be overcome by applying optical pumping (OP) methods to enhance nuclear spin polarization. For instance, OP of noble gases (such as xenon) is employed to dramatically increase their nuclear spin polarization by transferring angular momentum of laser light to electronic and …
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Using High-Powered, Frequency-Narrowed Lasers For Rb/129Xe and Cs/129Xe Spin-Exchange Optical Pumping To Achieve Improved Production of Highly Spin-Polarized Xenon For Use In Magnetic Resonance Applications
… through a process known as spin-exchange optical pumping (SEOP), where the angular momentum from resonant, circularly-polarized light is transferred to the electronic spins of an alkali-metal, and is subsequently transferred to the xenon nuclei through gas-phase collisions. While SEOP has …
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Spin dependent reactions in an electronically excited helium discharge
… helium metastable atoms is investigated using optical pumping and microwave diagnostic techniques. Wigner (1927) proposed that electron spin angular momentum is conserved in atomic collisions. This rule of elec-tron spin conservation is tested in the collision of two helium triplet metastable …
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Measurement and Modeling of OPNMR Phenomena in GaAs Semiconductors
… spin densities (≤ 10<sup>17</sup> nuclei). Optically pumped NMR (OPNMR) provides one method to get around this sensitivity barrier by utilizing the high electronic polarizations that can be generated through the application of polarized light.</p><p>Semiconducting materials are the …
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Development of a polarized Helium-3 ion source for RHIC using the electron beam ion source
… using the technique of metastability exchange optical pumping (MEOP), and will then be flowed into the newly commissioned Electron Beam Ion Source (EBIS). Fully stripped 3He++ ions will be extracted and their polarizations measured at low energies before acceleration in the RHIC complex.
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Label-free biosensor based upon a vertically emitting distributed feedback laser
… efficiently reduced by implementing a resonant optical pumping scheme. The proposed scheme couples the excitation laser light into a resonant mode and takes advantage of the intensified electromagnetic field. For a Bragg grating having a periodicity of 400 nm, a Rhodamine 590 doped polymer laser …
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Atomic beam techniques in a rubidium vapour cell
… a sealed vapour cell. A velocity selective optical pumping scheme was implemented to enable the detection of atoms of a particular velocity class travelling between two separated laser beams. This represents a new spectroscopic technique, the usefulness of which has been demonstrated through …
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Magnetically activated and guided isotope separation
… provided by calutrons. Our apparatus combines optical pumping with a scalable magnetic field gradient to enrich lithium-7 (Li-7) by suppressing lithium-6 (Li-6) throughput in a lithium atomic beam. We first evaporate lithium metal in a crucible in order to generate thermal, high flux beam. We …
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Top-down Cross-Section Controlled III-Nitride Nanowire Lasers
… of applications such as on-chip communication, optical sensing, and solid-state lighting. For practical applications, control over the lasing properties is needed. For example, a single mode lasing is beneficial for reducing the pulse broadening and the signal errors during the optical …
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A polarized ≥He ion source: Measuring the polarization
… at Rice University which uses the principle of optical pumping to produce polarized He ions for extraction and acceleration. The design of an experiment to measure the degree of polarization of the ions is described. 3He+ ions are accelerated to an energy of approximately 300 keV and produce …
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Semiconductor Laser Device-Level Characteristics
… lasers are highly desirable in cost-effective optical communication systems. Developing the experimental setups to extract the characteristics of the semiconductor lasers is vital to the future of the optical research projects. In this thesis, integrated experimental setup designs have been …
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