Active detection using frequency comb spectroscopy

使用两个激光频率梳的拍音的光谱法有望彻底改变红外光谱学领域，有望提供高灵敏度，高分辨率和巨大的测量速度。红外遥测测量质量的提高必将对诸如化学、生物制剂和污染物的检测等安全应用产生重要影响。这对于通过监测被认为是关键区域的空气质量来预防和减轻潜在事件以及在对事件的响应中帮助快速检测、识别和量化给定散布的粉末、液体、凝胶或气溶胶是否有害是重要的。为了将频率梳外差技术从目前展示它的极少数实验室中带出来，必须进行认真的工程研究，特别是关于便携式飞秒激光源的稳定。因此，本提案的最终目标是开发一种现场便携式频率梳外差中红外光谱仪，并与传统的红外远程检测技术相比，展示其安全应用的潜力。该项目的一个重要中间目标是开发极亮的中红外光源，可用于显着提高传统红外光谱仪的灵敏度。

Spectrometry using the beat note of two laser frequency combs is poised to revolutionize the field of infraredspectroscopy, promising to deliver high sensitivity, high resolution and tremendous measurement speed. Suchimprovements in the quality of infrared teledetection measurements will definitely have critical impacts onsecurity applications, such as the detection of chemical, biological agents and pollutants. This is important toprevent and mitigate potential events by monitoring the air quality in an area deemed critical as well as in theresponse to an event in helping to quickly detect, identify and quantify if a given disseminated powder, liquid,gel or aerosol is harmful or not.To bring the frequency comb heterodyne technique out of the very few labs currently demonstrating it, seriousengineering research has to be carried, notably on the stabilisation of portable femtosecond laser sources. Theend goal of this proposal is therefore to develop a field portable frequency comb heterodyne mid-infraredspectrometer and to demonstrate its potential for security applications in comparison with conventional infraredtele-detection techniques. A significant intermediate goal of the project is the development of extremely brightmid-infrared sources that could be use to significantly improve the sensitivity of conventional infraredspectrometers.