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.
Results
Showing 1 to 20 of 72 for “"Laser beams"”.
-
Entangling the spatial properties of laser beams
… for the position and momentum of two laser beams. The position and momentum observables for laser beams manifest themselves as the displacement and tilt of the beams, and entanglement relies on the used of squeezed TEM?? laser modes, mixed with a TEM?? reference mode. The result of the …
-
Entangling the spatial properties of laser beams
… for the position and momentum of two laser beams. The position and momentum observables for laser beams manifest themselves as the displacement and tilt of the beams, and entanglement relies on the used of squeezed TEM?? laser modes, mixed with a TEM?? reference mode. The result of the …
-
Phase stabilization of laser beams in a cold atom accelerometer
… measures the displacement of a proof mass of laser cooled atoms with respect to an instrument reference frame. The cold atom interferometer's reference frame is defined by a pair of specially prepared, counter-propagating laser beams, that measure inertially induced atom displacements with nm …
-
Generation and imaging of structural laser beams for optical trapping of airborne particles and light-matter interaction applications.
… emerged non-diffracting optical Bessel-Gaussian beams have extended the `optical toolbox' in laser interaction with matter studies, providing many techniques that are not possible using conventional Gaussian beams. The research work performed under this thesis focuses on the design, generation, …
-
Generation and imaging of structural laser beams for optical trapping of airborne particles and light-matter interaction applications.
… emerged non-diffracting optical Bessel-Gaussian beams have extended the `optical toolbox' in laser interaction with matter studies, providing many techniques that are not possible using conventional Gaussian beams. The research work performed under this thesis focuses on the design, generation, …
-
Micro laser personal projector
… research will describe some ways of steering laser beams in one dimension to produce up to a one-meter wide screen. A one dimensional micro laser array will be used to avoid the effect of flickering while projecting an image. The use of a single lens to focus all lasers will save the …
-
Design and Analysis of Refractive Optical Systems for Irradiance Redistribution of Collimated Radiation.
… are useful primarily in applications involving laser beams. Since a laser is a source of high intensity, coherent, monochromatic light, a number of diverse applications for lasers have been suggested. However, the laser beam does not have uniform distribution of light intensity across its …
-
Toward a demonstration of a Light Force Accelerometer
… radiation pressure from two counter-propagating laser beams optically confines a glass microsphere. Inertial acceleration of the device results in microsphere displacement along the sensitive axis, which is subsequently nulled by optical forces to provide an acceleration measurement. A simple …
-
Atomic beam techniques in a rubidium vapour cell
… velocity class travelling between two separated laser beams. This represents a new spectroscopic technique, the usefulness of which has been demonstrated through its applications. In the present work, the vapour cell atomic beam has been used to measure Larmor precession of polarised atoms in a …
-
Design of a dual beam optical trap
… radiation pressure from two counterpropagating laser beams to manipulate microscopic particles. Typical traps use optical fibers to guide those beams. This thesis proposes a design for the coaxial alignment of optical fibers that allows for the fibers to translate along a common axis while …
-
Sensitive, 3D micromotion compensation in a surface-electrode ion trap
… traps, and as traps are miniaturized in general, laser beams are brought closer to electrode surfaces, exacerbating laser-induced charging. Because of their charge, trapped ions are extremely sensitive to stray charges that accumulate on the trap surface. The DC potentials caused by stray charge …
-
Picosecond Dynamics of Free-Carrier Populations, Space-Charge Fields, and Photorefractive Nonlinearities in Zincblende Semiconductors
… allows large index changes to be generated with laser beams having only a few milliwatts of average power.Compound semiconductors are important photorefractive materials because they offer a near-infrared optical response, and because their carrier transport properties allow the index change to …
-
Coherent and partially coherent CW laser beam propagation in lens-like media: a diffractive ray-theoretic approach
… of coherent and partially coherent cw Gaussian laser beams in lens-like media (e.g., selfoc fibers, laser induced plasmas, etc.). The main results presented here extend those reported recently in connection with vacuum propagation and deterministic propagation through media characterized by a …
-
Πολυφωτονική φασματοσκοπία του Sr-αυτοϊονιζόμενες καταστάσεις με J=3 και διπλός ιονισμός
Focusing one or two dye laser beams in a Sr atomic beam and using a TOF mass spectrometer. A) We have recorded energy level positions and autoionization widths of the odd pavity J=3 states of Sr, in the energy range. Between the 5S1/2 and 4D3/2, 5/2 ionization limits. The analysis of the spectra …
-
Bridging the Geometric and Quantum Information of Structured Light
… phase that are enabled by spatially structuring laser beams. We then extend those concepts to complement the richer possibilities within quantum optics. Our work covers new abilities in tailoring and measuring the phase content of spatially-structured entangled photons, including the …
-
Laser Frequency Stabilization With Pound-Drever-Hall Technique
Laser frequency stabilization is important in laser science and various researches requiring laser beams with high frequency precision. However, the changes in physical parameters of the lasers themselves and in the external environments often cause instability in the output frequency of the laser. …
-
Automated Fiber Coupling with Actuated Mirrors
… physics experiments rely on precise alignment of lasers. For example, optical fields are used to cool, control, and image atoms in neutral atom arrays. In this thesis, we present a design for mirrors actuated by servos that allow the precise, repeatable alignment of lasers in free space optical …
-
Light Propagation in Ultracold Atomic Gases
… probe of systems engineered by the use of other laser beams. Part II (Chapters 4,5) is devoted to the development of a general framework for the time-dependent processing of a propagating slow Dark Polariton in a spatially inhomogeneous system. The coherently tunable atomic gas acts as a Dynamic …
-
Energy transfer between surface plasmon polariton modes with hybrid photorefractive liquid crystal cells
… energy transfer in a wave mixing system for two laser beams used to typically characterise photorefractive materials.<br/><br/>We first characterise the electrical and optical behaviour of the novel photorefractive plasmonic structure proposed with uniform illumination. Our system demonstrates a …
-
Surface Relief Grating on Thin Film Containing Azobenzene-Polymer Material Linked by Hydrogen-Bonding
… behavior under irradiation with two interfering laser beams. That leads to generate surface inscription pattering known as Surface Relief Grating (SRG). Moreover, two different types of polymers were used in this research, and we used them with new series of azobenzene compounds. In fact, the …
Page 1 of 4