2026-09-20T02:11:22Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/879462022-01-13T07:54:01Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Franz X. Kä̈rtner and Erich P. Ippen.
Huang, Wenqian Ronny
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2014-06-13T22:35:17Z
2014-06-13T22:35:17Z
2014
2014
http://hdl.handle.net/1721.1/87946
880414792
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 51-55).
The great difficulty of producing high intensity radiation in the terahertz (THz) spectral region by conventional electronics has stimulated interest in development of sources based on photonics. Optical rectification in lithium niobate is an attractive approach, because it supports high generation efficiencies, uses low cost, bulk LN crystals, and is powered by common Yb-doped lasers at wavelengths of around 1 Pm. In this work, a theoretical framework for THz generation by optical rectification is developed. Several novel methods for optimizing the generation efficiency are shown, including pump beam imaging, pump pulse optimization, cryogenic cooling, and THz antirefiection coating. Finally, experimental results will be presented showing a THz generation efficiency of 3.7%, which is 10x higher than current state-of-the-art. The generated few-cycle THz pulses can be used for coherent control of electrons, setting the stage for compact, table-top accelerators.
by Wenqian Ronny Huang.
S.M.
55 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
High field, high efficiency terahertz pulse generation by optical rectification
High field, high efficiency THz pulse generation by optical rectification
Thesis
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Publication
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<Abstract>The great difficulty of producing high intensity radiation in the terahertz (THz) spectral region by conventional electronics has stimulated interest in development of sources based on photonics. Optical rectification in lithium niobate is an attractive approach, because it supports high generation efficiencies, uses low cost, bulk LN crystals, and is powered by common Yb-doped lasers at wavelengths of around 1 Pm. In this work, a theoretical framework for THz generation by optical rectification is developed. Several novel methods for optimizing the generation efficiency are shown, including pump beam imaging, pump pulse optimization, cryogenic cooling, and THz antirefiection coating. Finally, experimental results will be presented showing a THz generation efficiency of 3.7%, which is 10x higher than current state-of-the-art. The generated few-cycle THz pulses can be used for coherent control of electrons, setting the stage for compact, table-top accelerators.</Abstract>
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