對摻鐿鎢酸釓鉀晶體之自拉曼及自鎖模雷射在線性腔的研究

Investigation of Self-Raman and Self-Mode-Locked Yb:KGW Lasers with Linear Cavity

趙雅蕙(Ya-Huei Chao)

指導教授 ： 陳永富

國立交通大學/理學院/電子物理系所/碩士(2015年)

https://doi.org/10.6842/NCTU.2015.00623

摘要

固態雷射在現今許多領域，包含工程、生醫、科學等皆有廣泛的應用。而其眾多種類的增益介質中，摻鐿鎢酸釓鉀晶體被視為極有潛力的材料。本篇論文研究主要可分為兩部分，以摻鐿鎢酸釓鉀晶體作為增益介質分別做出自拉曼和自鎖模雷射。在自拉曼雷射的實驗中，透過不同的共振腔透射率設計，我們主要觀察到摻鐿鎢酸釓鉀晶體81、109及203cm 的拉曼轉換，並且做出頻譜帶半高寬達10.5nm的自拉曼雷射，具有成為寬頻雷射的潛力。在自鎖模雷射的實驗中，使用外架共振腔下，我們比較了平面晶體與楔形晶體的鎖模表現。實驗結果顯示使用楔形晶體相較於平面晶體僅需微調晶體角度即可有效抑制標準具效應，並可較易調整出更穩定且鎖模表現佳的雷射，其脈衝重複率為15GHz，脈衝半高寬可達約1.53皮秒。

關鍵字

摻鐿鎢酸釓鉀 ； 自拉曼雷射 ； 自鎖模雷射

並列摘要

Nowadays, solid state lasers are widely utilized in many fields such as engineering, biomedicine, science and so on. Among all the gain media, Yb:KGW is regarded as a kind of promising material. In this thesis, we use a Ng-cut Yb:KGW crystal as gain medium to accomplish a self-Raman laser and self-mode-locked laser respectively. In the experiment of the self-Raman laser, we observe the main Raman shift of 81, 109 as well as 203 cm and attain the self-Raman laser with a 10.5-nm FWHM(full width at half maximum) bandwidth, which possesses the potential to be a wideband laser. In the experiment of the self-mode-locked laser, we compare the wedged crystal with the plane one by the mode-locked performance. According to the experimental result, the tilted angles of the wedged crystal for suppressing the etalon effect is comparatively smaller. Besides, utilizing the wedged crystal also makes it easier to reveal the stable mode-locked laser output, which generates the pulse width of 1.53 ps with the pulse repetition rate of 15GHz.

並列關鍵字

Yb:KGW ； self-Raman laser ； self-mode-locked laser

參考文獻

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