發(fā)布時(shí)間：2018-11-03 13:23

【摘要】：鈮酸鋰是一種非常優(yōu)秀的人工晶體,它有著穩(wěn)定的機(jī)械性能,耐高溫、抗腐蝕,易加工,價(jià)格低廉。并且它是集聲光、壓電和非線性光學(xué)等多種效應(yīng)于一身的多功能晶體,它擁有無機(jī)物中最大的非線性光學(xué)系數(shù)。通過對(duì)鈮酸鋰晶體的鐵電疇周期性反轉(zhuǎn)制作的周期性極化鈮酸鋰(periodically poled lithium niobate, PPLN)已經(jīng)廣泛的應(yīng)用于激光的倍頻、光參量振蕩和光波導(dǎo)等方面。本文的主要研究內(nèi)容是對(duì)鈮酸鋰微疇結(jié)構(gòu)加工工藝的探究,主要包括以下兩個(gè)方面：1.搭建了一套針尖加高壓直寫式的鈮酸鋰微疇結(jié)構(gòu)加工實(shí)驗(yàn)平臺(tái),設(shè)計(jì)了相關(guān)的機(jī)械結(jié)構(gòu),包括微動(dòng)平臺(tái),支撐調(diào)平裝置,針尖觀察和調(diào)節(jié)裝置,樣品臺(tái)等多個(gè)部分的結(jié)構(gòu)設(shè)計(jì)。組建了整個(gè)平臺(tái)的運(yùn)動(dòng)控制系統(tǒng),通過GALIL控制器實(shí)現(xiàn)平臺(tái)的運(yùn)動(dòng)控制和高壓脈沖電源的控制,并且編寫了PC端的控制軟件。2.實(shí)驗(yàn)了在不同條件下的鈮酸鋰晶體的點(diǎn)疇和線疇的制作。通過無損的偏振光檢測法觀察到了制作好的疇結(jié)構(gòu),并通過USB采集設(shè)備采集到了相應(yīng)的疇圖像。對(duì)比了電壓、停留時(shí)間和速度這三個(gè)因素對(duì)疇尺寸的影響。得出表面疇結(jié)構(gòu)隨著電壓的增大或者加電壓持續(xù)時(shí)間的增大而增大,隨著速度的增大而減小的結(jié)論。并在最后通過氫氟酸腐蝕法驗(yàn)證了偏振光檢測得到的結(jié)果。
[Abstract]:Lithium niobate is an excellent intraocular crystal with stable mechanical properties, high temperature resistance, corrosion resistance, easy processing and low price. It is a multifunctional crystal with acousto-optic, piezoelectric and nonlinear optical effects. It has the largest nonlinear optical coefficient in inorganic materials. The periodically polarized lithium niobate (periodically poled lithium niobate, PPLN) fabricated by periodically reversing ferroelectric domain of lithium niobate crystal has been widely used in laser frequency doubling, optical parametric oscillation and optical waveguide. The main content of this paper is to explore the fabrication technology of lithium niobate microdomain structure, including the following two aspects: 1. An experimental platform for the fabrication of lithium niobate microdomain structure with pinpoint and high pressure direct writing was built. The related mechanical structures were designed, including the fretting platform, the support leveling device, the tip observation and adjusting device, the sample table and so on. The motion control system of the whole platform is set up. The motion control of the platform and the control of the high voltage pulse power supply are realized by GALIL controller. The control software of the PC terminal is written. 2. The fabrication of point domain and line domain of lithium niobate crystal under different conditions was studied. The domain structure was observed by nondestructive polarized light detection, and the domain images were collected by USB acquisition device. The effects of voltage, residence time and velocity on domain size are compared. It is concluded that the surface domain structure increases with the increase of the voltage or the duration of the applied voltage, and decreases with the increase of the velocity. Finally, the results of polarizing light detection were verified by hydrofluoric acid etching method.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ131.11

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本文編號(hào)：2307915