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Study of the power efficiency of coherent transient signals in inhomogeneously broadened media.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Study of the power efficiency of coherent transient signals in inhomogeneously broadened media./
作者:	Wang, Tsaipei.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1999,
面頁冊數:	162 p.
附註:	Source: Dissertations Abstracts International, Volume: 61-01, Section: B.
Contained By:	Dissertations Abstracts International61-01B.
標題:	Optics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9925775
ISBN:	9780599254473

Study of the power efficiency of coherent transient signals in inhomogeneously broadened media.
Wang, Tsaipei.

Study of the power efficiency of coherent transient signals in inhomogeneously broadened media. - Ann Arbor : ProQuest Dissertations & Theses, 1999 - 162 p.

Source: Dissertations Abstracts International, Volume: 61-01, Section: B.

Thesis (Ph.D.)--University of Oregon, 1999.

This item must not be sold to any third party vendors.

We report in this dissertation both theoretical and experimental studies of the power efficiency of photon echoes and stimulated echoes, two coherent transient phenomena that have been extensively studied. The echo signals are generated when an inhomogeneously broadened medium is excited by a sequence of input laser fields. It was believed that the echo power efficiency, defined as the echo power compared with the power of one particular input field, can only be a few percent or lower. Our study shows that we can obtain echo signals with power efficiency beyond unity both numerically and experimentally by identifying proper conditions. Our study includes systems with media either outside of or within optical cavities. We carry out the theoretical study using the model of inhomogeneously broadened two-level atoms interacting with coherent laser fields. We model the atom-field interaction using the Maxwell-Bloch equations, which we also numerically integrate to obtain output fields. We identify various parameters important for efficiency echo generation, including optical thickness, laser beam spatial profile, relative bandwidths of excitation fields, among others. We also invent a figure of merit to quantify echo deformation, which is important for various echo applications. The experimental study consists of two parts. The case without an optical cavity is carried out using an atomic Yb vapor cell. The other utilizes a Tm:YAG crystal inside a Fabry-Perot cavity. We observe echo power efficiency beyond unity in both cases after material relaxation is taken into account. In the first case, the dependence of echo power efficiency on various parameters are examined and found to be in good agreement with theoretical predictions. In addition, we also derive relations between input and intra-cavity pulse areas for both ring-cavity and Fabry-Perot cases. Such relations show interesting bistable behavior for certain parameter ranges. This might lead to a new frontier in understanding the coherent atom-field interaction in cavity environments.

ISBN: 9780599254473Subjects--Topical Terms:

517925
Optics.
Subjects--Index Terms:

Coherent

Study of the power efficiency of coherent transient signals in inhomogeneously broadened media.
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300 $a 162 p.
500 $a Source: Dissertations Abstracts International, Volume: 61-01, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Mossberg, Thomas W.
502 $a Thesis (Ph.D.)--University of Oregon, 1999.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a We report in this dissertation both theoretical and experimental studies of the power efficiency of photon echoes and stimulated echoes, two coherent transient phenomena that have been extensively studied. The echo signals are generated when an inhomogeneously broadened medium is excited by a sequence of input laser fields. It was believed that the echo power efficiency, defined as the echo power compared with the power of one particular input field, can only be a few percent or lower. Our study shows that we can obtain echo signals with power efficiency beyond unity both numerically and experimentally by identifying proper conditions. Our study includes systems with media either outside of or within optical cavities. We carry out the theoretical study using the model of inhomogeneously broadened two-level atoms interacting with coherent laser fields. We model the atom-field interaction using the Maxwell-Bloch equations, which we also numerically integrate to obtain output fields. We identify various parameters important for efficiency echo generation, including optical thickness, laser beam spatial profile, relative bandwidths of excitation fields, among others. We also invent a figure of merit to quantify echo deformation, which is important for various echo applications. The experimental study consists of two parts. The case without an optical cavity is carried out using an atomic Yb vapor cell. The other utilizes a Tm:YAG crystal inside a Fabry-Perot cavity. We observe echo power efficiency beyond unity in both cases after material relaxation is taken into account. In the first case, the dependence of echo power efficiency on various parameters are examined and found to be in good agreement with theoretical predictions. In addition, we also derive relations between input and intra-cavity pulse areas for both ring-cavity and Fabry-Perot cases. Such relations show interesting bistable behavior for certain parameter ranges. This might lead to a new frontier in understanding the coherent atom-field interaction in cavity environments.
590 $a School code: 0171.
650 4 $a Optics. $3 517925
650 4 $a Electrical engineering. $3 649834
650 4 $a Atomic physics. $3 3173870
653 $a Coherent
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653 $a Power efficiency
653 $a Thalium
653 $a Transient signals
653 $a Ytterbium
690 $a 0752
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710 2 $a University of Oregon. $3 958250
773 0 $t Dissertations Abstracts International $g 61-01B.
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793 $a English
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