【摘要】：鈮酸鋰(LiNbO3)晶體是一種廣泛應用于電子及光電產(chǎn)業(yè)的人工合成材料,可以利用它的壓電特性、鐵電特性、電光特性以及非線性光學特性等性質(zhì)實現(xiàn)一系列的應用。它最廣泛的應用是利用其壓電特性制備聲表面波器件,這廣泛應用于手機及其他無線終端產(chǎn)品之中。由于鈮酸鋰晶體具備優(yōu)越的電光特性,鈮酸鋰也作為很多電光調(diào)制器的核心材料也廣泛應用于光學通信領域。目前,鈮酸鋰的非線性光學特性也被越來越多地應用于波長轉換等領域,鈮酸鋰周期性極化技術的發(fā)展促進了激光波長轉換、光學參量振蕩器、光學信號處理器等一系列的成果。我們知道,基于鈮酸鋰材料的非線性光學應用需要滿足相位匹配條件,準相位匹配技術是當前應用較為廣泛的相位匹配技術。準相位匹配技術是通過鈮酸鋰疇工程實現(xiàn)的,通過在鈮酸鋰晶體中制備特定的疇反轉結構,就可以實現(xiàn)準相位匹配技術。當前鈮酸鋰疇反轉工藝中應用最為廣泛的是外加電場極化法,光學誘導法近年來也受到較多的關注,本課題組采用高壓針尖極化方法成功制備了疇反轉結構。本論文主要研究采用高壓針尖極化方法實現(xiàn)鈮酸鋰疇反轉的工藝條件,為此我們搭建了一套基于高壓針尖極化方法的鈮酸鋰極化疇結構制備裝置,并針對不同的極化電壓、高壓脈沖占空比等條件分別進行了點疇與線疇結構制備實驗,以探究了高壓針尖極化法的工藝條件。我們實驗中使用的樣品是摻鎂濃度為5%的鈮酸鋰晶體,在實驗中得出了點疇、線疇結構制備的工藝條件。當極化電壓控制在2.6 kV～2.8 kV時,可以制備較為規(guī)則的正六邊形點狀疇反轉結構;當極化電壓控制在2.7 kV左右,高壓脈沖占空比為25%,掃描速度為15μm/s時,可以制備較為均勻的線狀疇反轉結構。除此之外,我們也采用外加電場極化方法制備了沿晶體各個方向的輻射狀疇結構,探究了其最佳實驗條件。
[Abstract]:Lithium niobate (LiNbO3) crystal is a synthetic material widely used in electronics and optoelectronic industry. It can be used to realize a series of applications by using its piezoelectric, ferroelectric, electro-optical and nonlinear optical properties. It is widely used to fabricate saw devices by using its piezoelectric properties, which is widely used in mobile phones and other wireless terminal products. Because lithium niobate crystal has excellent electro-optic characteristics, lithium niobate is also widely used in optical communication field as the core material of many electro-optic modulators. At present, the nonlinear optical properties of lithium niobate are more and more used in the field of wavelength conversion. The development of periodic polarization technology of lithium niobate has promoted the laser wavelength conversion and optical parametric oscillator. A series of achievements such as optical signal processor. We know that the application of nonlinear optics based on lithium niobate needs to meet the phase matching conditions, and the quasi-phase matching technology is widely used at present. The quasi-phase matching technique is realized by the domain engineering of lithium niobate. The quasi-phase matching technique can be realized by preparing a specific domain inversion structure in the lithium niobate crystal. At present, the most widely used lithium niobate domain inversion process is the external electric field polarization method, and the optical induction method has been paid more attention in recent years. Our team successfully prepared the domain inversion structure by high-voltage tip polarization method. In this paper, the process conditions of domain inversion of lithium niobate by using high voltage tip polarization method are studied. For this reason, we have built a device for preparing the domain structure of lithium niobate polarization based on the method of high voltage pinpoint polarization, and aim at different polarization voltages. The preparation experiments of point domain and line domain structure were carried out under the condition of duty cycle ratio of high voltage pulse, respectively, in order to explore the process conditions of high voltage tip polarization method. The sample used in our experiment is a 5% mg doped lithium niobate crystal. In the experiment, the preparation conditions of point domain and linear domain structure are obtained. When the polarization voltage is controlled at 2.6 kV~2.8 kV, the regular hexagonal dot domain inversion structure can be prepared, when the polarization voltage is controlled at about 2.7 kV, the duty cycle of the high voltage pulse is 25 and the scanning speed is 15 渭 m / s. A uniform linear domain inversion structure can be prepared. In addition, the radiation domain structures along various directions of the crystals were prepared by the method of external electric field polarization, and the optimum experimental conditions were investigated.
【學位授予單位】：中國科學技術大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ131.11

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