單片非週期性晶疇極化反轉鈮酸鋰同時作為Nd:YVO4雷射Q-調制和腔內光參量產生之研究; Single aperiodically poled lithium niobate for simultaneous laser Q-switching and optical parametric generation in a Nd:YVO4 laser

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题名:	單片非週期性晶疇極化反轉鈮酸鋰同時作為Nd:YVO4雷射Q-調制和腔內光參量產生之研究;Single aperiodically poled lithium niobate for simultaneous laser Q-switching and optical parametric generation in a Nd:YVO4 laser
作者:	王俊霖;Chun-lin Wang
贡献者:	光電科學研究所
关键词:	鈮酸鋰;光參量產生;Q-調制;非週期;aperiodically;Q-switching;ptical parametric generation;lithium niobate
日期:	2010-08-27
上传时间:	2010-12-08 14:22:44 (UTC+8)
出版者:	國立中央大學
摘要:	光參量振盪器(optical parametric oscillators; OPOs)是最常用來得到可調式雷射的技術之一，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單塊非週期性鈮酸鋰晶體上。此兩種元件分別為一電光Q-調制及一光參量產生器。我們利用一非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:YVO 4 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。實際量測APLN，在外加重覆率為1kHz的電場360V/mm，所得1550nm最窄脈寬約為5.1857ns，尖峰功率為一千零二十九瓦特；而串級式EO OPG PPLN的外加電場為360V/mm，所得1550nm最窄脈寬約為4.2879ns，尖峰功率為四百六十九瓦特。兩者結果相比，半波電場部分相距不大，幾乎平手；而尖峰功率部分，APLN和串級式EO OPG PPLN的比值為2.2；OPO轉換效率的比值為1.67。 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 Q-switching and an optical parametric generator (OPG). An aperiodically poled lithium niobate (APLN) 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 APLN crystal in a Nd:YVO4 laser system to simultaneously function as a laser Q switch and an intracavity optical parametric amplifier. We have successfully demonstrated an efficient EO Q-switched IOPO in a compact diode-pumped 1064-nm Nd:YVO4 laser achieved using a single intracavity APLN.The APLN device was designed using the SA optimization method. It can simultaneously function as an EO Q-switch and an OPG.The OPO efficiency achieved with the system using the APLN device has been ~1.67 times higher than that with a system using a cascade PPLN device of the same device length and under the same system operating conditions. When the intracavity APLN was driven with a ~ 360-V pulse train at 1 kHz, we observed ~ 33 % energy depletion in fundamental laser pulses, yielding ~ 5-ns, ~ 1029W peak-power 1550-nm OPO laser pulses from this compact laser system pumped at 8.4-W diode power.
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