Filamentation Tera-Hertz pulse generation

丝状太赫兹脉冲生成

• 批准号: 351057-2007
• 负责人: Chin, SeeLeang
• 金额: $ 10.59万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=366490
• 关键词: Filamentation; Tera; Hertz; pulse; generation

We propose to efficiently generate Tera-Hertz (THz) pulses using a new technique developed in the applicant'slaboratory. It is based upon the phenomenon of self-focusing of intense femtosecond (one millionth of atrillionth of a second) laser pulses in air. After self-focusing, the pulse will self-transform into a long streak ofsharp foci. We call the latter a filament. A laser pulse propagating inside the filament of the intensefemtosecond laser pulse will be locked on to the latter so that they propagate together and produce a newelectromagnetic pulse through a physical process called four-wave-mixing. This latter technique can produceelectromagnetic pulses whose frequencies could range from the UV to the radio frequency. The applicant andco-workers have demonstrated the feasibility of this technique in the visible region. A patent on this newtechnique is being filed. This project proposes to focus on generating THz pulses using the same technique.The current partner, Defense Research and Development of Canada in Valcartier, is in urgent need of a newtechnique to generate such pulses at short and long ranges to detect chemical and biological agents such asanthrax and explosives for the obvious reason of security. The proposed project would generate newknowledge and technology and increase the number of highly qualified personnel in the areas of ultrafast lasertechnology..

我们提出使用在申请人的实验室中开发的新技术来有效地产生太赫兹（THz）脉冲。它是基于强烈的飞秒（万亿分之一秒的百万分之一）激光脉冲在空气中的自聚焦现象。自聚焦后，脉冲将自转变为一条长的锐焦点条纹。我们称后者为灯丝。在强飞秒激光脉冲的灯丝内传播的激光脉冲将被锁定在后者上，使得它们一起传播并通过称为四波混频的物理过程产生新的电磁脉冲。后一种技术可以产生电磁脉冲，其频率范围从紫外线到无线电频率。申请人及其同事已经证明了这种技术在可见光区的可行性。这项新技术的专利正在申请中。目前的合作伙伴，加拿大国防研究与发展部（Defense Research and Development of Canada in Valcartier）迫切需要一种新技术来产生这种短距离和长距离的脉冲，以探测化学和生物制剂，如炭疽和爆炸物，这显然是出于安全考虑。拟议的项目将产生新的知识和技术，并增加超快激光技术领域的高素质人才数量。