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THEORETICAL STUDY OF BEAM TRANSFORMATIONS BY VOLUME DIFFRACTION
| Title: | THEORETICAL STUDY OF BEAM TRANSFORMATIONS BY VOLUME DIFFRACTION. |
 34 views 13 downloads |
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| Name(s): |
Mokhov, Sergiy, Author Zeldovich, Boris, Committee Chair University of Central Florida, Degree Grantor |
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| Type of Resource: | text | |
| Date Issued: | 2011 | |
| Publisher: | University of Central Florida | |
| Language(s): | English | |
| Abstract/Description: | Laser beams can be manipulated by volume diffractive elements in addition to conventional optical elements like mirrors, lenses, and beam splitters. Conventional optical elements can be described by applying the basic laws of reflection and refraction at the surfaces of the elements. Even diffraction by surface gratings utilizes relatively simple mathematics. This is to be contrasted with the volume diffraction, which requires coupled wave theory in the slowly varying envelope approximation (SVEA) to obtain accurate results. Efficient spatially distributed diffraction of laser beams is possible due to the high coherence of laser light, and it occurs at specific resonant Bragg conditions. This research work is inspired and driven by the successful development of recording technology for robust, high-efficiency volume Bragg gratings (VBGs) in photo-thermo-refractive (PTR) glass. Mostly VBGs of the reflective type are discussed in this dissertation. Starting with an analysis of electro-magnetic wave propagation in layered media, we have reformulated Fresnel and volume reflection phenomena in terms of a convenient parameter S - strength of reflection. The influence that the different non-uniformities inside a VBG have on its spectral properties has been examined. One important result of this work is the proposal of moire VBG and the derivation of an analytical expression for its bandwidth. A multiplexed VBG used as a coherent combiner is discussed as well. Beam distortion via transmission through and/or reflection by a heated VBG due to residual absorption is analyzed. | |
| Identifier: | CFE0004054 (IID), ucf:49152 (fedora) | |
| Note(s): |
2011-08-01 Ph.D. Optics and Photonics, College of Optics and Photonics Doctorate This record was generated from author submitted information. |
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| Subject(s): |
Bragg grating propagation matrix Fresnel reflection multiplexed grating moire detuning selectivity holographic beam combining beam quality |
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| Persistent Link to This Record: | http://purl.flvc.org/ucf/fd/CFE0004054 | |
| Restrictions on Access: | campus 2014-07-01 | |
| Host Institution: | UCF |
