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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 汪治平 | |
| dc.contributor.author | Yi-Hsian Hsieh | en |
| dc.contributor.author | 謝奕賢 | zh_TW |
| dc.date.accessioned | 2021-05-17T10:18:04Z | - |
| dc.date.available | 2012-01-17 | |
| dc.date.available | 2021-05-17T10:18:04Z | - |
| dc.date.copyright | 2012-01-17 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-12-14 | |
| dc.identifier.citation | [1] 李青翰，林凡異，兆赫茲漫談，物理雙月刊卅一卷97-107(2009)
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7052 | - |
| dc.description.abstract | 兆赫茲波是頻率介在紅外光與微波之間的電磁波，波長範圍在30 μm到3 mm之間，許多分子的振動、轉動能階能量皆落在這個波段，使兆赫茲波光源成為研究物質的絕佳利器，在天文、化學、凝態物理、生物醫學皆更重要的應用。但是產生高強度的兆赫茲波並不容易，幸好，超短脈衝雷射的誔生帶來了曙光：光導天線、光整流、四波混頻、雷射與固態靶材交互作用等方法，不但產生了具時間解析能力的兆赫茲脈衝，並且將單發脈衝的兆赫茲波能量提升到 μJ的等級。
不過就應用的需求來說，μJ等級的能量仍是不足的，世界各地的團隊迄今仍致力於改良現更的產生方法，期能將光強度大幅提升。2005年，中國科學院物理研究所的盛政民教授等人針對以往的雷射與固態靶材交互作用的實驗結果，提出線性模式轉換的物理機制來解釋兆赫茲波產生。根據他們的理論，固態靶材表面預游離電漿的密度梯度大小對兆赫茲波產生更決定性的影響，只要適當控制電漿環境，可能可以產生高強度兆赫茲波。 本實驗便是以該理論為指引，多使用一道雷射預脈衝，更系統的控制主脈衝入射前的電漿環境，期能驗證盛政民等人的模型，並且提升現更的兆赫茲脈衝能量紀錄。實驗結果發現，電漿密度梯度比較平緩的環境，更利於兆赫茲波光源的產生，與盛政民等人的預測並不相違背；此外，我們一舉將單發兆赫茲脈衝能量的紀錄提升到近20 μJ，產生高強度的兆赫茲波脈衝光源。 | zh_TW |
| dc.description.abstract | Terahertz wave is electromagnetic wave ranging from 30 μm to 3 mm. Because a large portion of molecules have vibrational states and rotational states with energy at same order of Terahertz photon, Terahertz source becomes a powerful tool to investigate micro world. It has wide applications in fields such as astronomy, chemistry, condensed physics, and biomedical sciences. Though Thz wave can play an important role in science field, the lack of intense terahertz light source frustrated the progress of its application. Fortunately, the invention of ultrashort pulse laser provide a series of new methods to generate THz wave. These methods include: photoconductive antenna, optical rectification, four-wave mixing, and laser-plasma interaction on surface of solid target. These methods not only raises the energy record of Thz production, but also produces Thz wave in pulse form, which means it can be the source of a time-resolved spectroscopy.
These methods can produce Thz pulse with energy as high as μJ level per shot, but it still doesn’t meet the need for applications. Many research groups are still working on the modification of these methods, wishing to raise the energy record. In 2005, group from Institute of Physics Chinese academy of sciences published their new result: Z.M. Sheng at el proposed a model to explain the Thz production in laser-plasma interaction on solid target. According to their theory, density scale length of preformed plasma plays an important role on THz generation. By controlling the plasma environment properly, intense THz pulse might be enhanced. Guided by above model, our experiment is the first using a laser prepulse to control the plasma environment in order to verify the model and attempt to raise current energy record. Experimental result shows that longer density scale length profits THz generation. This result is in agreement with the model. Moreover, Intense THz pulse is produced and has energy nearly 20 μJ per shot. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-17T10:18:04Z (GMT). No. of bitstreams: 1 ntu-100-R95222045-1.pdf: 2633761 bytes, checksum: 74a9cdc03e10d3053b279d480928b827 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 口詴委員會審定書 ........................................................................................................... #
誌謝 ...................................................................................................................................i 中文摘要 ......................................................................................................................... iii ABSTRACT .....................................................................................................................iv CONTENTS ...................................................................................................................... v LIST OF FIGURES ....................................................................................................... viii LIST OF TABLES ............................................................................................................. x Chapter 1 緒論............................................................................................................ 1 1.1 兆赫茲波段光源的用途與重要性 ................................................................ 1 1.2 兆赫茲波技術發展現況 ................................................................................ 3 1.3 數種兆赫茲脈衝產生機制介紹 .................................................................... 5 1.3.1 光導天線 ............................................................................................... 5 1.3.2 光整流效應 ........................................................................................... 7 1.3.3 四波混頻 ............................................................................................... 8 1.4 雷射聚焦固態靶材產生兆赫茲波文獻回顧 .............................................. 11 Chapter 2 利用預脈衝雷射控制電漿環境以增強兆赫茲脈衝產生 ..................... 15 2.1 學理探討－電漿環境對兆赫茲脈衝產生效率的影響 .............................. 16 2.1.1 相位匹配條件 ..................................................................................... 17 2.1.2 線性模式下的能量轉換效率 ............................................................. 19 2.1.3 尾跡場振幅強度與雷射參數的關係 ................................................. 20 2.1.4 小結 ..................................................................................................... 21 2.2 預脈衝雷射控制電漿環境 .......................................................................... 23 2.2.1 預脈衝雷射控制電漿環境 ................................................................. 23 2.2.2 預脈衝參數設計 ................................................................................. 25 Chapter 3 實驗儀器架設與操作方法 ..................................................................... 28 3.1 一百兆瓦雷射系統 ...................................................................................... 28 3.2 光路系統 ...................................................................................................... 31 3.2.1 光路介紹 ............................................................................................. 31 3.2.2 金鏡作為兆赫茲波導光鏡 ................................................................. 33 3.2.3 鍺與矽作為濾光材料 ......................................................................... 34 3.3 錄音帶式靶材系統 ...................................................................................... 37 3.4 兆赫茲波能量量測系統 .............................................................................. 41 3.4.1 量測系統光路介紹 ............................................................................. 41 3.4.2 焦電偵測器( pyroelectric detector ) ................................................... 43 3.5 光路校正步驟 .............................................................................................. 45 Chapter 4 實驗結果與討論 ..................................................................................... 47 4.1 中紅外光最佳化 .......................................................................................... 48 4.1.1 預脈衝光領先1ns 和 9ns ................................................................. 48 4.1.2 預脈衝光領先 5.6ns .......................................................................... 50 4.2 兆赫茲脈衝最佳化 ...................................................................................... 52 4.2.1 預脈衝光領先5.6ns ........................................................................... 52 4.2.2 預脈衝光領先 9.5ns .......................................................................... 56 4.3 中紅外光極化方向以及主脈衝強度對輸出的影響 .................................. 60 Chapter 5 結論與展望 ............................................................................................. 63 5.1 結論 .............................................................................................................. 63 5.2 展望 .............................................................................................................. 64 REFERENCE .................................................................................................................. 66 | |
| dc.language.iso | zh-TW | |
| dc.subject | 兆赫茲 | zh_TW |
| dc.subject | 雷射 | zh_TW |
| dc.subject | 脈衝雷射 | zh_TW |
| dc.subject | 紅外光 | zh_TW |
| dc.subject | laser | en |
| dc.subject | THz | en |
| dc.subject | terahertz | en |
| dc.subject | pulse laser | en |
| dc.subject | infrared | en |
| dc.title | 以強場雷射脈衝與固態靶材交互作用產生高強度兆赫茲脈衝 | zh_TW |
| dc.title | Generation of Intense THz Pulse by the Interaction of an Intense Laser Pulse with a Solid Target | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳賜原,朱旭新 | |
| dc.subject.keyword | 雷射,兆赫茲,脈衝雷射,紅外光, | zh_TW |
| dc.subject.keyword | laser,THz,terahertz,pulse laser,infrared, | en |
| dc.relation.page | 68 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2011-12-14 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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