【作者】 田震；

【导师】 邢岐荣；

【作者基本信息】 天津大学 ， 物理电子学， 2007， 硕士

【摘要】 基于光学整流原理的THz波时域光谱技术是一种非常有效的电磁辐射相位相干测试技术。该技术在当当今广泛的研究领域扮演着越来越重要的角色。本论文采用理论与实验相结合的方法,利用我们实验室自行搭建的THz时域光谱实验系统,对于THz波发射过程所诱导的Kerr效应进行了实验研究,同时研究了一种宽带THz波光谱整形方法。本论文主要包括以下几方面工作:1、在大量阅读文献的基础上,综述了THz科学技术的产生、探测和应用。2、介绍了基于光学整流原理的THz波产生和利用线性电光效应探测THz辐射的基本原理。3、在实验室原有的自行搭建的以自锁模Ti: sapphire飞秒激光器为激励源建立的THz波时域光谱实验装置的基础上,将其改装成迈克尔逊干涉仪型THz波光谱整形实验装置,进行了基于干涉原理对宽带THz波光谱整形的实验研究。4、详细讨论了基于光学整流的THz波产生过程中诱导的Kerr效应和类Kerr效应,并给出THz产生过程中所诱导的区分Kerr效应和二阶非线性级联的实验方法。更多还原

【Abstract】 Terahertz time-domain spectrometry (THz-TDS) based on optical rectification is an effective phase-coherent photometric method by which one can directly measure the time-resolved electric-field both amplitude and phase of a subpicosecond THz radiation pulse generated by the mode-locked femtosecond pulse laser. At present, this technology is playing a more and more important role in many research fields. In this dissertation, some experimental research of THz is developed based on THz-TDS system. The main works are classified as follows:1. The most recent results of THz science and technology were reviewed.2. The principle of generating and detecting THz radiation is introduced.3. Using the homemade Self-mode-locked Ti: sapphire femtosecond pulse laser as a pump source,a THz Michelson interference setup based on THz-TDS is built. Using the setup, spectrum shaping based on the principle of interference is investigated in detail.4. Kerr nonlinearity and Kerr-like nonlinearity induced by femtosecond pulses via terahertz generation and electro-optical effect are investigated. A method to distinguish the two signals experimentally is proposed.更多还原