標題: 研究光激發式半導體雷射在簡併與非簡併腔之空間與時間狀態
Exploring spatial and temporal states in optically pumped semiconductor lasers at degenerate cavities and non-degenerate cavities
作者: 楊肇能
陳永富
Yang, Chao-Neng
Chen, Yung-Fu
理學院應用科技學程
關鍵字: 自鎖模雷射;簡併腔;非簡併腔;光激發式半導體雷射;Self mode locking;degenerate cavities;non-degenerate cavities;optically pumped semiconductor laser
公開日期: 2016
摘要: 本論文利用高功率的光激發式半導體雷射模組作為實驗的架構,雷射共振腔的組成由不同曲率平凹透鏡當作輸出鏡,改變激發功率與雷射共振腔長,觀察在簡併與非簡併腔之現象比較。在實驗過程中,利用在共振腔中架設光閘(Aperture),探討高階橫模數量的多寡對於時域狀態的影響,發現當要產生完整的自鎖模現象時,不能單單只有縱模的存在,高階橫模的存在也是一大因素,接著觀察在簡併腔長底下,高階橫模頻率與縱模頻率為三分之一時,探討光激發式半導體雷射在簡併腔長下的空間與時域態表現,在實驗研究中透過改變不同曲率半徑的輸出鏡(ROC=100mm及200mm)及共振腔長,過程中發現雷射光斑呈現特殊的三角形圖案,在某幾個共振腔長中,有完整的自發性鎖模現象產生,我們也針對此現象去觀察與紀錄其變化行為。
We use high-power optically pumped semiconductor laser module as experimental architecture, the laser resonant cavity composed by the different curvatures plano-concave lens as an output mirror, via adjusting the pumping power and laser resonator length, observe transverse pattern, temporal trace and RF power spectrum in the non-degenerate and degenerate cavity. During the experiment, we add an aperture in the resonance cavity and investigate the influence of high-order transverse modes on the self-mode locking (SML) in an optically pumped semiconductor laser (OPSL). We discovered the temporal behavior becomes the random dynamics when too many high-order transverse modes are excited. In the degenerate cavity we found the laser spot that presents special triangular pattern when the ratio of fT and fL approaches to 1/3, we also found that the curve of output power will drop first and then rise.
URI: http://etd.lib.nctu.edu.tw/cdrfb3/record/nctu/#GT070352908
http://hdl.handle.net/11536/143461
顯示於類別:畢業論文