晶体温度对飞秒激光诱导铁电畴反转过程的影响研究  

Influence of crystal temperature on femtosecond laser induced ferroelectric domain inversion process

作　　者：徐天翔 王森 林锦阳 赵如薇 徐铁峰 盛艳 XU Tian-Xiang;WANG Sen;LIN Jin-Yang;ZHAO Ru-Wei;XU Tie-Feng;SHENG Yan(Laboratory of Infrared Materials and Devices,Research Institute of Advanced Technologies,Ningbo University,Ningbo 315211,China;Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province,Ningbo University,Ningbo 315211,China;Ningbo Institute of Oceanography,Ningbo 315832,China)

机构地区：[1]宁波大学高等技术研究院红外材料及器件实验室,浙江宁波315211 [2]先进红外光电材料及器件浙江省工程研究中心,浙江宁波315211 [3]宁波海洋研究院,浙江宁波315832

出　　处：《红外与毫米波学报》2025年第1期97-102,共6页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(62275136,12274248);浙江省自然科学基金(LY22F050009);宁波大学王宽诚基金。

摘　　要：近红外飞秒激光诱导铁电畴反转技术是三维非线性光子晶体制备领域的重要手段,基于其制备的样品已在光学频率变换和非线性波前整形领域取得了一系列重要研究成果。目前,已报道的激光诱导铁电畴反转过程均在常温下进行,然而铁电体在升温时会逐步趋近居里点,其矫顽场等与铁电畴反转特性相关的物理性质均会随温度升高而发生改变,但目前关于温度对飞秒激光诱导铁电畴反转过程的影响规律尚不明确。本文选取居里温度约70~80℃的铌酸锶钡铁电晶体作为加工基质,在温度25~65℃下利用近红外飞秒激光诱导了反转铁电畴结构,通过观测结构的二次谐波光场分布推测铁电畴反转情况,获得了不同温度下畴反转所需的激光阈值功率,并对影响规律的产生原因进行了推测。The near-infrared femtosecond laser induced ferroelectric domain inversion in an important method in 3D nonlinear photonic crystal fabrication.Using structures produced by this technique,a series of attractive results have been achieved in optical frequency conversion and nonlinear wavefront shaping.At present,the reported laser induced domain inversion were all implemented at room temperature.For ferroelectric crystals,it would reach the Curie point during heating,and many characterizations such as coercive field which relate to domain inversion may change seriously.However,the effect of crystal temperature on femtosecond laser induced domain inversion is undefined.In this work,the strontium barium niobate(SrxBa1-xNbO3)ferroelectric crystal with the Curie point of about 70-80℃depends on component proportion of Sr and Ba was used for domain inversion.Direct near-infrared femtosecond laser writing was implemented at the temperature of 25-65℃.The domain inversion condition was judged based on the second-harmonic pattern in the far field.The variation tendency of threshold laser power for domain inversion depends on temperature was tested and possible reason was predicted.

关 键 词：飞秒激光加工 铁电畴反转 非线性光子晶体 准相位匹配 

分 类 号：O437[机械工程—光学工程]