https://scholars.lib.ntu.edu.tw/handle/123456789/120284
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor | 林清富 | en |
dc.contributor | 臺灣大學:光電工程學研究所 | zh_TW |
dc.contributor.author | 蘇益信 | zh |
dc.contributor.author | Su, Yi-Shin | en |
dc.creator | 蘇益信 | zh |
dc.creator | Su, Yi-Shin | en |
dc.date | 2007 | en |
dc.date.accessioned | 2007-11-25T23:44:03Z | - |
dc.date.accessioned | 2018-07-05T02:50:03Z | - |
dc.date.available | 2007-11-25T23:44:03Z | - |
dc.date.available | 2018-07-05T02:50:03Z | - |
dc.date.issued | 2007 | - |
dc.identifier | zh-TW | en |
dc.identifier.uri | http://ntur.lib.ntu.edu.tw//handle/246246/50856 | - |
dc.description.abstract | 我們在這個論文裡進一步研究量子點雷射的行為,包括量子點元件裡的兩種反競爭效應,以及量子點外共振腔雷射的穩定性。 在我們所觀察到的第一種反競爭效應裡,在激發態波長的雷射光,會幫助在基態波長的雷射光得到更多載子。實驗裡所使用的激發態雷射光其波長是1170nm,基態雷射光的波長則是在1240nm到1265nm之間。反競爭效應最明顯的時候,是基態雷射光在1245nm到1250nm之間以及在1260nm時。量子點元件裡測量到的反競爭效應其強度主要受量子點對激發態雷射光的吸收效率影響,因此當基態波長雷射共振腔的損耗減少,使得量子點內的載子數目減少而更容易吸收激發態的雷射光時,反競爭效應就會增強。 在第二種反競爭效應的實驗裡,使用的雷射二極體會自己在1250 nm產生雷射共振。反競爭效應發生在當外加的共振腔激發起另一道在基態波長的雷射光時,位於1170 nm的激發態發光因此增強10dB以上。這個效應在外部共振腔的雷射共振波長與元件本身的雷射波長(1250 nm)相差15nm時最為明顯。 我們的第二個研究主題是量子點外共振腔雷射的穩定性,量子點外共振腔雷射能穩定工作的電流範圍比量子井外共振腔雷射能穩定工作的電流範圍小。從實驗的數據可以了解,當共振腔的長度增加或是當共振腔的回饋減少時,量子點外共振腔雷射的行為會更傾向於不穩定。從理論模擬可以證明這種不穩定行為與量子點的兩個特質有關,第一個是載子在激發態以及基態間躍遷速率的限制(phonon bottle neck effect) ,第二個是激發態載子對基態雷射Fabry-Perot模態波長的影響。 | zh_TW |
dc.description.abstract | In this dissertation, we further study the behaviors of quantum dot lasers. The topics include two types of anti-competition behaviors and the stability of quantum dot external cavity lasers. In the first type anti-competition behavior, the laser corresponding to the excited-state emission wavelength assists the laser corresponding to the ground-state emission wavelength to gain more carriers. In our experiment, the excited-state laser emission is at 1170 nm. The ground-state laser emission is between 1240 nm to 1265 nm. This anti-competition behavior is most obvious when the ground-state laser emission is between 1245 nm to 1250 nm or is at 1260 nm. In the experimental setup for the second type anti-competition behavior, the laser diode can oscillate by it self at 1250 nm. The second type anti-competition behavior occurs when the external cavity induces another laser oscillation at the ground-state wavelength. The emission of the excited-states at 1170 nm wavelength increases by more than 10dB. This effect is most obvious when the wavelength of the laser induced by the external cavity differs from 1250 nm by 15 nm. The second topic in this dissertation is the stability of the quantum dot external cavity laser. The current range in which the quantum dot external cavity laser can operate stably is smaller than that of the quantum well external cavity laser. The experiment indicates that the quantum dot external cavity laser tends to be more unstable when the cavity length increases, and when the feedback efficiency decreases. The unstable behavior is theoretically confirmed to be relating to the characteristics of the quantum dot materials. The first is the finite carrier transition time between the ground state and the excited state inside a quantum dot. The second is the shift of the Fabry-Perot mode wavelength versus the excited-state carrier population. | en |
dc.description.tableofcontents | 口試委員會審定書……………………………………………i 誌謝…………………………………………………………ii 中文摘要…………………………………………………………iii 英文摘要…………………………………………………………iv 第一章 導論……………………………………………………………………·· 1 1.1半導體主動光學元件的應用與特性要求……………………………… 1 1.2理想量子點增益材料的優點…………………………………………… 2 1.3實際的量子點增益材料之特性………………………………………… 3 1.4論文內容簡介…………………………………………………………… 4 第二章 第一種反競爭效應……………………………………………………·· 8 2.1 第一種反競爭效應的原理……………………………………………… 8 2.2 量子井元件裡的第一種反競爭效應…………………………………·· 10 2.3在量子點裡觀察第一種反競爭效應所使用的元件以及雷射共振腔結構…………………………………………………………………………····· 15 2.4 第一種反競爭效應的觀察結果………………………………………·· 20 2.4.1反競爭效應的基本特徵………………………………………··· 20 2.4.2電流對反競爭效應的影響……………………………………··· 22 2.4.3基態雷射波長改變對反競爭效應的影響……………………··· 24 2.5 第一種反競爭效應的實驗數據分析…………………………………·· 26 2.5.1激發態雷射強度對反競爭效應的影響………………………··· 26 2.5.2反競爭效應的單向性…………………………………………··· 28 2.5.3 1250 nm雷射共振腔的損耗改變對反競爭效應的影響……····· 28 2.5.4 60 mA到80 mA之間電流改變對反競爭效應的影響………······· 30 2.5.5 基態雷射波長對反競爭效應的影響…………………………··· 31 第三章 第二種反競爭效應…………………………………………………… 35 3.1第二種反競爭效應的原理……………………………………………·· 35 3.2第二種反競爭效應的實驗架構………………………………………·· 38 3.3第二種反競爭效應的觀察……………………………………………·· 39 3.3.1第二種反競爭效應的發生……………………………………··· 39 3.3.2外部共振腔共振波長對第二種反競爭效應的影響…………··· 42 3.3.3激發態放光頻譜的變化………………………………………··· 43 3.3.4注入電流對第二種反競爭效應的影響………………………··· 44 3.4第二種反競爭效應的分析……………………………………………·· 48 3.4.1第二種反競爭效應與外部共振腔共振波長的關係…………··· 48 3.4.2第二種反競爭效應對量子點的選擇性………………………··· 50 第四章 量子點雷射的L-I特性………………………………………………· 52 4.1量子點材料量子井材料的不同之處…………………………………·· 52 4.2量子點外共振腔雷射的電流-功率特性實驗……………………………··· 53 4.2.1外共振腔雷射使用的增益元件以及實驗架構…………………………· 53 4.2.2 量子點外共振腔雷射的典型電流-功率關係…………………· 55 4.2.3 量子點外共振腔雷射輸出頻譜隨電流的變化………………··· 60 4.2.4 量子點外共振腔雷射工作模態的分類………………………··· 62 4.2.5 Littman/Metcalf雷射架構以及Littrow雷射架構的比較…· 63 4.2.6外部共振腔長度以及外部共振腔回饋效率對不穩定行為的影響············································································································ 63 4.3量子點外共振腔雷射的理論模型……………………………………·· 65 4.4量子點外共振腔雷射的模擬結果……………………………………·· 72 4.4.1雷射輸出功率以及載子數目隨時間的變化…………………··· 72 4.4.2量子點外共振腔雷射的穩定性分析…………………………··· 74 4.4.3 不穩定行為與量子點材料之特質的關聯……………………··· 75 4.4.4 與其它理論的比較……………………………………………··· 78 第五章 總結…………………………………………………………………… 82 | zh_TW |
dc.language | zh-TW | en |
dc.language.iso | en_US | - |
dc.subject | 半導體雷射 | en |
dc.subject | 量子點 | en |
dc.subject | 光放大器 | en |
dc.subject | semiconductor laser | en |
dc.subject | quantum dot | en |
dc.subject | optical amplifier | en |
dc.title | 寬頻半導體雷射的載子動力學 | zh |
dc.title | Carrier Dynamics of Broadband Semiconductor Lasers | en |
dc.type | thesis | en |
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item.fulltext | no fulltext | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_46ec | - |
item.grantfulltext | none | - |
item.openairetype | thesis | - |
item.languageiso639-1 | en_US | - |
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