本文主要研究内容
作者李宏伟（2019）在《布里渊光谱频域-空域调控关键技术研究》一文中研究指出：自受激布里渊散射(Stimulated Brillouin Scattering,SBS)现象被发现以来,围绕SBS效应进行的基础科学研究和商业化应用备受人们关注,已成为非线性光学的重要分支和研究热点,在SBS相位共轭镜、陀螺仪、分布式光纤传感器、可调节慢光、微波光子滤波器、动态光栅、激光放大、非线性光学显微成像以及高维轨道角动量(Orbital Angular Momentum,OAM)光-声存储等领域取得了一系列显著成果,但是微弱布里渊光谱信号在强噪声背景下的测量速度是限制SBS技术发展的重要因素。因此,本文以布里渊光谱信号的快速测量和信噪可控分离为切入点,针对不同研究和应用需求,提出两种频域凝视泵浦-探测布里渊光谱快速测量技术;针对实现布里渊光谱信噪分离的OAM空间模分滤噪技术中存在的问题,提出OAM空间模式平顶增益技术,提出目标光场空间调控与放大的信噪可控分离技术,对所提技术进行了理论分析和实验验证。本文首先从SBS耦合波方程出发,建立了频域凝视泵浦-探测布里渊光谱技术理论模型。建立了涉及OAM空间模式的受激布里渊放大(Stimulated Brillouin Amplification,SBA)理论模型,推导了用于精确描述OAM光束产生和传播演化特性的解析式,指出OAM空间模分滤噪技术中高阶模式滤波器降低信号增益的主要原因是由于泵浦光与加载OAM空间模式的信号光能量重叠区域不匹配导致的。结合频域凝视泵浦-探测布里渊光谱技术理论模型,理论分析了采用该技术实现布里渊光谱快速测量的可行性,该方案基于SBA原理,信号具有较高信噪比(Signal to Noise Ratio,SNR),其次无需频域逐点扫频获取功率谱的耗时过程。针对多声子模式介质,提出自相位匹配种子光注入式布里渊增益光谱(Brillouin Gain Spectrum,BGS)快速测量技术,引入自发辐射光源和带通滤波器组成的随机任意偏振态种子光,研究种子光注入过程中的能量转移及双峰BGS信号随介质特性改变的变化规律,主级BGS最大增益约为15dB,实现非扫描的多峰BGS测量。以二维显微成像为研究背景,提出布里渊光谱啁啾调制探测技术,采用周期性三角波信号对分布式反馈激光器进行直接调制,将调制后的平顶带宽可控输出光作为Stokes和anti-Stokes种子光,分别实现BGS和布里渊损耗谱(Brillouin Loss Spectrum,BLS)的非扫描测量,在光学相干外差探测中通过偏振分光手段,BGS的SNR可提高近21dB,BLS的最大SNR为23dB,实现了非扫描的BGS和BLS测量。结合OAM空间模式的SBA理论模型,针对OAM空间模分滤噪技术中布里渊增益较低的问题,提出任意OAM空间模式平顶增益技术。利用4f成像系统,将OAM模式波源成像到非线性介质中,消除因自由空间传播导致的相互作用光束间能量重叠区域不匹配问题,提高高阶OAM光束的布里渊增益。现有实验条件下,针对OAM空间模式为?=10的Stokes信号光,大信号能量转移效率可以提高12.4%,小信号增益可以提高27.5dB。此外,该技术有望在高维OAM空间模式复用中实现空间模式信道的均匀、选择性滤波放大,并可用于其它涉及OAM空间模式的光学系统中。最后,针对现有布里渊光谱技术信噪分离方法的不足,提出目标光场空间调控与放大的信噪可控分离技术,首次将针对空间频谱操作的希尔伯特变换引入三阶非线性光学领域,率先在空间频域开展了围绕布里渊光谱信噪分离技术的研究工作。理论和实验对比分析了目标光场调控基本原理,讨论了噪声来源和解决方案,实验结果证明该技术在布里渊光谱技术中可实现信噪可控分离。
Abstract
zi shou ji bu li yuan san she (Stimulated Brillouin Scattering,SBS)xian xiang bei fa xian yi lai ,wei rao SBSxiao ying jin hang de ji chu ke xue yan jiu he shang ye hua ying yong bei shou ren men guan zhu ,yi cheng wei fei xian xing guang xue de chong yao fen zhi he yan jiu re dian ,zai SBSxiang wei gong e jing 、tuo luo yi 、fen bu shi guang qian chuan gan qi 、ke diao jie man guang 、wei bo guang zi lv bo qi 、dong tai guang shan 、ji guang fang da 、fei xian xing guang xue xian wei cheng xiang yi ji gao wei gui dao jiao dong liang (Orbital Angular Momentum,OAM)guang -sheng cun chu deng ling yu qu de le yi ji lie xian zhe cheng guo ,dan shi wei ruo bu li yuan guang pu xin hao zai jiang zao sheng bei jing xia de ce liang su du shi xian zhi SBSji shu fa zhan de chong yao yin su 。yin ci ,ben wen yi bu li yuan guang pu xin hao de kuai su ce liang he xin zao ke kong fen li wei qie ru dian ,zhen dui bu tong yan jiu he ying yong xu qiu ,di chu liang chong pin yu ning shi beng pu -tan ce bu li yuan guang pu kuai su ce liang ji shu ;zhen dui shi xian bu li yuan guang pu xin zao fen li de OAMkong jian mo fen lv zao ji shu zhong cun zai de wen ti ,di chu OAMkong jian mo shi ping ding zeng yi ji shu ,di chu mu biao guang chang kong jian diao kong yu fang da de xin zao ke kong fen li ji shu ,dui suo di ji shu jin hang le li lun fen xi he shi yan yan zheng 。ben wen shou xian cong SBSou ge bo fang cheng chu fa ,jian li le pin yu ning shi beng pu -tan ce bu li yuan guang pu ji shu li lun mo xing 。jian li le she ji OAMkong jian mo shi de shou ji bu li yuan fang da (Stimulated Brillouin Amplification,SBA)li lun mo xing ,tui dao le yong yu jing que miao shu OAMguang shu chan sheng he chuan bo yan hua te xing de jie xi shi ,zhi chu OAMkong jian mo fen lv zao ji shu zhong gao jie mo shi lv bo qi jiang di xin hao zeng yi de zhu yao yuan yin shi you yu beng pu guang yu jia zai OAMkong jian mo shi de xin hao guang neng liang chong die ou yu bu pi pei dao zhi de 。jie ge pin yu ning shi beng pu -tan ce bu li yuan guang pu ji shu li lun mo xing ,li lun fen xi le cai yong gai ji shu shi xian bu li yuan guang pu kuai su ce liang de ke hang xing ,gai fang an ji yu SBAyuan li ,xin hao ju you jiao gao xin zao bi (Signal to Noise Ratio,SNR),ji ci mo xu pin yu zhu dian sao pin huo qu gong lv pu de hao shi guo cheng 。zhen dui duo sheng zi mo shi jie zhi ,di chu zi xiang wei pi pei chong zi guang zhu ru shi bu li yuan zeng yi guang pu (Brillouin Gain Spectrum,BGS)kuai su ce liang ji shu ,yin ru zi fa fu she guang yuan he dai tong lv bo qi zu cheng de sui ji ren yi pian zhen tai chong zi guang ,yan jiu chong zi guang zhu ru guo cheng zhong de neng liang zhuai yi ji shuang feng BGSxin hao sui jie zhi te xing gai bian de bian hua gui lv ,zhu ji BGSzui da zeng yi yao wei 15dB,shi xian fei sao miao de duo feng BGSce liang 。yi er wei xian wei cheng xiang wei yan jiu bei jing ,di chu bu li yuan guang pu zhao jiu diao zhi tan ce ji shu ,cai yong zhou ji xing san jiao bo xin hao dui fen bu shi fan kui ji guang qi jin hang zhi jie diao zhi ,jiang diao zhi hou de ping ding dai kuan ke kong shu chu guang zuo wei Stokeshe anti-Stokeschong zi guang ,fen bie shi xian BGShe bu li yuan sun hao pu (Brillouin Loss Spectrum,BLS)de fei sao miao ce liang ,zai guang xue xiang gan wai cha tan ce zhong tong guo pian zhen fen guang shou duan ,BGSde SNRke di gao jin 21dB,BLSde zui da SNRwei 23dB,shi xian le fei sao miao de BGShe BLSce liang 。jie ge OAMkong jian mo shi de SBAli lun mo xing ,zhen dui OAMkong jian mo fen lv zao ji shu zhong bu li yuan zeng yi jiao di de wen ti ,di chu ren yi OAMkong jian mo shi ping ding zeng yi ji shu 。li yong 4fcheng xiang ji tong ,jiang OAMmo shi bo yuan cheng xiang dao fei xian xing jie zhi zhong ,xiao chu yin zi you kong jian chuan bo dao zhi de xiang hu zuo yong guang shu jian neng liang chong die ou yu bu pi pei wen ti ,di gao gao jie OAMguang shu de bu li yuan zeng yi 。xian you shi yan tiao jian xia ,zhen dui OAMkong jian mo shi wei ?=10de Stokesxin hao guang ,da xin hao neng liang zhuai yi xiao lv ke yi di gao 12.4%,xiao xin hao zeng yi ke yi di gao 27.5dB。ci wai ,gai ji shu you wang zai gao wei OAMkong jian mo shi fu yong zhong shi xian kong jian mo shi xin dao de jun yun 、shua ze xing lv bo fang da ,bing ke yong yu ji ta she ji OAMkong jian mo shi de guang xue ji tong zhong 。zui hou ,zhen dui xian you bu li yuan guang pu ji shu xin zao fen li fang fa de bu zu ,di chu mu biao guang chang kong jian diao kong yu fang da de xin zao ke kong fen li ji shu ,shou ci jiang zhen dui kong jian pin pu cao zuo de xi er bai te bian huan yin ru san jie fei xian xing guang xue ling yu ,lv xian zai kong jian pin yu kai zhan le wei rao bu li yuan guang pu xin zao fen li ji shu de yan jiu gong zuo 。li lun he shi yan dui bi fen xi le mu biao guang chang diao kong ji ben yuan li ,tao lun le zao sheng lai yuan he jie jue fang an ,shi yan jie guo zheng ming gai ji shu zai bu li yuan guang pu ji shu zhong ke shi xian xin zao ke kong fen li 。
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论文作者分别是来自哈尔滨理工大学的李宏伟，发表于刊物哈尔滨理工大学2019-07-29论文，是一篇关于布里渊光谱论文,频域凝视测量论文,空间模式论文,平顶增益论文,信噪分离论文,哈尔滨理工大学2019-07-29论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自哈尔滨理工大学2019-07-29论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：布里渊光谱论文; 频域凝视测量论文; 空间模式论文; 平顶增益论文; 信噪分离论文; 哈尔滨理工大学2019-07-29论文;