Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 62 for “"stimulated emission"”.
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Terahertz oscillation and stimulated emission from planar microcavities
… into a high-Q microcavity, the spontaneous emission is amplified at the cavity mode frequency enabling stimulated emission in an inverted system. Although some of theses cavity e®ects can only be understood by quantum elec- trodynamic theory, most mechanisms are accessible by classical and …
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Fluorescence Depletion by Stimulated Emission in Single-Molecule Spectroscopy
This thesis presents the first application of the stimulated emission depletion (STED) technique to the field of single-molecule fluorescence spectroscopy. It is demonstrated that fluorescence quenching induced by STED is reversible and can be repeated a large number of cycles on a single molecule. …
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Adaptive optics stimulated emission depletion microscope for thick sample imaging
… the fluorescent super-resolution techniques, Stimulated Emission Depletion (STED) microscopy has been particularly interesting, as it is a purely optical technique which does not require post image processing. STED microscopy has proven to resolve structures down to the molecular resolution. …
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Global and Local Models for Dilution Factors: Theory and Stimulated Emission Pumping Experiments
… for a single molecule (SCCl2) was examined. Stimulated emission pumping (SEP) experiments were performed on SCCl2, probing the 7000--8,000 cm-1 range on the ground electronic state from first excited state and the 7,000--10,000+ cm-1 range from the second electronic state. An extended cross …
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Stimulated emission from biological materials and novel optical resonators for diagnostic and imaging applications
The first detailed optical characterization of any biological laser, providing spectral, temporal, threshold, and polarization characteristics for the flavin mononucleotide biomolecular laser, is presented here. In addition, our investigation of natural, bio-engineered, and complex biological laser …
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Low-dose imaging of liver diseases through neutron stimulated emission computed tomography: Simulations in GEANT4
<p>Neutron stimulated emission computed tomography (NSECT) is a non-invasive, tomographic imaging technique with the ability to locate and quantify elemental concentration in a tissue sample. Previous studies have shown that NSECT has the ability to differentiate between benign and malignant tissue …
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Stimulated Emission Depletion (STED) Microscopy and Pacific Orange Dye Optimization For H9C2 Cox-1 Imaging Via Indirect Immunocytochemistry
… hindering microbiology and other forms of study. Stimulated Emission Depletion microscopy is one of many new frontiers of microscopy that has recently broken through this diffraction barrier. By utilizing multiple competing sources of light, STED has produced high-resolution, nanoscale images of …
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Absorption spectroscopy using optical masers including a discussion of early investigations into the process of stimulated emission of radiation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1963.
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Nodal photolithography : lithography via far-field optical nodes in the resist
In this thesis, I investigate one approach - stimulated emission depletion - to surmounting the diffraction limitation of optical lithography. This approach uses farfield optical nodes to orchestrate reversible, saturable optical transitions in certain photoresist compounds. After addressing prior …
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STED microscopy in the visible range
… depletion of the molecular excited state by stimulated emission, stimulated emission depletion (STED) breaks the resolution barrier in the important subfield of fluorescence microscopy. To this end, STED microscopy utilizes a doughnut-shaped beam featuring a central zero which is capable of …
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The transfer of polarized radiation in astrophysical masers in the presence of magnetic fields
Polarized emission from astrophysical masers can provide important information about physical conditions in both star forming and circumstellar environments. Calculations are performed which give the spectra of the emergent maser radiation for different magnetic fields, radiative intensities, decay …
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Stabilization of autoionizing states
… the case when a laser field was used to induce stimulated emission of the excited core electron. Stabilization is referred to all the atoms that form a singly excited neutral state after being in a doubly excited autoionizing state. Relative to pure fluorescence, the application of a laser pulse …
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Semiconductor quantum dot lasers.
Stimulated emission in semiconductor quantum dot (QD) laser structures is demonstrated. Red-emitting, self-assembled QDs of highly strained InAlAs were grown by molecular beam epitaxy on GaAs substrates. Carriers injected electrically from the doped regions of separate confinement heterostructures …
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Wavelength Modified and Strained-Layer Quantum-Well Heterostructure and Superlattice Lasers (aluminum-Gallium - Arsenide)
… used to alter the output energy of these lasers. Stimulated emission in strained-layer QWH's and SL's is demonstrated, and the form of their failure is examined.
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Diatomic excimer dynamics in microplasma lamps and alkali lasers
… (194.2 nm). The photoassociation and subsequent stimulated emission of cesium (Cs) - rare gas (Ar or Xe) pairs were examined by laser pump-probe experiments, and an optical-to-optical energy conversion efficiency of ~28% was observed when Cs-Ar pairs were pumped at 836.7 nm and stimulated …
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High-resolution spectroscopic investigations of rovibrational state mixing in ground electronic states
… methyl formate are presented. The technique of Stimulated Emission Pumping (SEP) spectroscopy is used to examine the effect of an intramolecular van der Waals interaction on intermode coupling of the carbonyl vibrational modes in methyl glyoxal. Rovibrational state mixing in the aldehyde CH …
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FLUORESCENCE STUDIES OF EXCIPLEX MOLECULES IN THE VACUUM ULTRAVIOLET REGIME
… with this new facility was the observation of emission from the triatomic rare gas halide Ne$\sb 2$F* at 132 nm. An investigation of the kinetic processes for both Ne$\sb 2$F* and its precursor NeF*, which emits at 108.5 nm, was performed. Several relevant rate coefficients were determined. It …
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Point Spread Function Engineering in Fluorescence Spectroscopy
… verifiziert, dass Entvölkerung durch stimulierte Emission (stimulated emission depletion) dazu verwendet werden kann, zwischenmolekularen Förster-Energie-Transfer in einer Probe zu identifizieren.
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Three -Port Modulation of Indium Gallium Phosphide/gallium Arsenide Transistor Lasers
… shift in HBT laser operation from spontaneous to stimulated emission is manifest as a distinct change in the HBT current-voltage characteristics, specifically a decrease in the common-emitter current gain (betadc = IC/IB) and the occurrence of even a more striking peak in the small signal (ac) …
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External cavity laser label-free biosensor
… a high quality factor through the process of stimulated emission, while at the same time providing high sensitivity, large dynamic range and simple detection instrumentation. The photonic crystal is fabricated inexpensively from plastic materials, and its resonant wavelength is tuned by …
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