以單塊二維週期性晶格極化反轉鈮酸鋰同時作為Nd:YVO4雷射之電光Q調制器和腔內光參量振盪器; Monolithic 2D periodically poled lithium niobate (PPLN) as simultaneous an electro-optic Q switch and Optical parametric oscillator(OPO) in Nd:YVO4 laser

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題名:	以單塊二維週期性晶格極化反轉鈮酸鋰同時作為Nd:YVO4雷射之電光Q調制器和腔內光參量振盪器;Monolithic 2D periodically poled lithium niobate (PPLN) as simultaneous an electro-optic Q switch and Optical parametric oscillator(OPO) in Nd:YVO4 laser
作者:	張錫雄;Hsi-Hsiung Chang
貢獻者:	光電科學研究所
關鍵詞:	電光布拉格偏折器;二維週期性極化反轉鈮酸鋰;光參量產生器;bragg deflector;PPLN;lithium niobate
日期:	2010-01-28
上傳時間:	2010-06-11 16:12:54 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	具有可調變波長和高同調性的光參量振盪器(optical parametric oscillators; OPOs)在遙測、光譜學、非線性光學、測距儀、光通訊、生醫等，都有很廣泛的應用。利用聲光、電光元件來作Q調制脈衝雷射搭配非線性晶體，達成高效率的非線性波長轉換，此等元件亦不少。但積體多樣元件於單塊晶體的多功能元件並不多見。本篇論文致力於把兩種功能的元件整合在同一塊鈮酸鋰晶體上。此兩種元件分別為一電光布拉格偏折器及一光參量產生器。我們利用一二維週期性晶格極化反轉鈮酸鋰晶體來同時滿足驅動此二元件所需之相位匹配，並將它放置在一Nd:YVO4雷射共振腔內同時作為雷射Q調制器及腔內光參量放大器。本研究主要以此二維週期性晶格極化反轉鈮酸鋰晶體進行Nd:YVO4雷射腔內光參量產生和光參量振盪實驗。我們於實驗中觀察到了二維準相位匹配結構的特殊寬角頻率波長轉換現象。光參量振盪所產生的波長1550 nm的最大峰值功率約7W，頻寬約0.73 nm。實驗發現光參量振盪器較光參量產生器的輸出閥值降低1.4倍，峰值功率提高5倍，頻寬窄了7.3倍。本研究亦提出進一步改善本實驗架構以提升光參量轉換效率。 Abstract Optical parametric oscillators (OPOs) can produce wavelength tunable coherent light sources and have been widely used in various applications including the remote sensing, spectroscopy, nonlinear optics, range finder, optical communications, and bio-medicine. Several high-efficiency intracavity wavelength converters have been developed via the use of a nonlinear crystal in an acousto-optic or electro-optic (EO) Q-switched solid-state laser. However, a more compact integrated system performing the same device functions is still rare. In this thesis, we have devoted to integrate two device functions in a monolithic LiNbO3 crystal. These two devices are an EO Bragg deflector and an optical parametric generator (OPG). A 2D periodically poled lithium niobate (PPLN) crystal has been designed and fabricated in this work to simultaneously satisfy the phase-matching conditions required for functioning the two devices. We further inserted this 2D PPLN crystal in a Nd:YVO4 laser system to simultaneously function as a laser Q switch and an intracavity optical parametric amplifier. We have performed an intracavity OPG (IOPG) and an intracavity OPO (IOPO) experiments using the fabricated 2D PPLN in a diode-pumped Nd:YVO4 laser system. During the experiments, a line OPG emission source has been observed in such a light source, which is exactly the signature with a 2D QPM wavelength converter. The diode pump threshold (<4 W), output peak power (~7 W), and output spectral bandwidth (~0.73 nm) of the measured OPO signals have been reduced by a factor of 1.4, enhanced by 5 folds, and narrowed by a factor of 7.3 in comparison with those measured from the OPG signal, respectively. Finally we also proposed in this thesis advanced laser schemes to further enhance the overall system efficiency.
顯示於類別:	[光電科學研究所] 博碩士論文

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