基于频率梳的太赫兹频率精确测量方法研究

项目名称： 基于频率梳的太赫兹频率精确测量方法研究

项目编号： No.61205099

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 孙青

作者单位： 中国计量科学研究院

项目金额： 28万元

中文摘要： 随着太赫兹技术的发展和广泛应用，太赫兹的参数计量需求日益增加。频率和功率是电磁波最重要的两个基本物理量，研究太赫兹频率的精确测量方法并建立太赫兹频率计量标准具有十分重要的意义。本项目将开展基于频率梳方法的太赫兹频率精确测量方法研究。利用光纤飞秒激光激发光电导天线产生太赫兹频率梳，重点研究频率梳的产生方法以及频率稳定与高精度控制问题；实现被测太赫兹源与频率梳的高效相互作用，研究其频率精确测量方法，在此基础上，建立基于频率梳的太赫兹频率计量标准装置，实现连续波太赫兹源的频率精确测量；系统研究影响太赫兹频率测量结果的主要因素，提高太赫兹频率测量精度与准确度，降低系统测量不确定度；研究基于频率梳的物质太赫兹波段特征吸收谱线的高精度测量方法。通过本项研究，将对推动太赫兹技术的发展、扩展太赫兹的应用起到积极作用。

中文关键词： 太赫兹；频率梳；频率计量；重复频率；锁相技术

英文摘要： Along with recent progress in THz technology, the requirements of THz metrology have increased in various applications. So the national metrology insitutes are faced with a number of metrological challenges that need to be solved in order to help this new technology become marketable. Frequency and power are the most important two quantities to be measured because they are fundamental physical quantities of electromagnetic wave, so the project will carry out a research on THz frequency metrology based on frequency comb method. Firstly, The THz frequency comb will be generated from a photoconductive antenna pumped by a femtosecond fiber laser, and the frequency spacing of the THz frequency comb will be stabilized by controlling the repetition rate of the femtosecond laser. And then the THz source to be measured will interact with the frequency comb, the method of how to get its frequency accurately will be studied. Thirdly, we will investigate the main factors which affect the measurement results, to improve the precision and reduce the uncertainty. At last, we will study how to measure THz spectral characteristic of meterials with high precision based on frequency comb method. Through these studies, the development of THz technology and its applications will be promoted.

英文关键词： terahertz；frequency comb；frequency metrology；repetition rate；phase-locked technology