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Narrowband diamond Raman lasers for remote sensing of trace gases

用于微量气体遥感的窄带金刚石拉曼激光器

基本信息

批准号：
267204784
负责人：
Dr. Oliver Lux
金额：
--
依托单位：
Department of Physics and Astronomy
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/267204784?language=en
关键词：
Narrowband diamond Raman lasers remote

项目摘要

Stimulated Raman scattering (SRS) in crystalline solids allows for efficient frequency conversion of laser radiation to spectral regions which are not directly accessible using conventional laser gain media. The process involves the nonlinear interaction of intense pump radiation with vibrational modes (phonons), producing discrete emission lines whose wavelengths are up- (Stokes) or down-shifted (anti-Stokes Raman scattering) with respect to the pump wavelength. Integration of a Raman-active medium into an optical resonator with appropriate specifications (Raman laser) enables selective amplification of single lines and thus the generation of specific laser wavelengths. This is of particular interest for remote sensing of atmospheric trace gases by means of powerful lasers emitting in the near infrared spectral range. Here, strict requirements regarding the spatial and spectral radiation characteristics have to be met. In the framework of his previous scientific work the applicant has investigated more than 20 Raman-active crystals with regard to the excitation of SRS-promoting vibrational modes and has quantified their interaction strengths. After selection of a suitable material a complex Raman laser system has been developed and employed for carbon dioxide detection under laboratory conditions. Based on these studies the planned project focuses on the Raman-active material diamond which is especially well-suited to converting high power laser radiation due to its exceptional thermal and optical properties and which has experienced a rapid upswing in the field of laser physics in recent years. With a view to the application of diamond Raman lasers for trace gas detection, the spectral properties of these laser sources should be analyzed using modern measurement techniques. The major goal of the project is the development of a wavelength tunable diamond Raman laser with narrow linewidth. For this purpose, a novel concept aiming at the spectral control of the laser emission will be studied. Its feasibility will be evaluated by absorption measurements of ammonia. The research serves as proof-of-principle to demonstrate the potential of (diamond) Raman lasers for spectroscopic applications and especially to stimulate their further development for remote sensing. Moreover, the project is meant to provide a synergy of expertise since the group of Prof. R. P. Mildren at Macquarie University in Sydney is one of the leading groups in terms of high power diamond Raman lasers, while the applicant has experience in both frequency stabilization techniques and solid-state lasers for trace gas detection. Expansion of the applicant's spectrum of methods will enable him to provide important contributions to the climate and environmental research in the future.

晶体固体中的受激拉曼散射（SRS）允许激光辐射到使用常规激光增益介质不能直接访问的光谱区域的有效频率转换。该过程涉及强泵浦辐射与振动模式（声子）的非线性相互作用，产生其波长相对于泵浦波长上移（斯托克斯）或下移（反斯托克斯拉曼散射）的离散发射线。将拉曼活性介质集成到具有适当规格的光学谐振器（拉曼激光器）中使得能够选择性地放大单条线，从而产生特定的激光波长。这对于通过发射近红外光谱范围的强激光器遥感大气痕量气体特别有意义。这里，必须满足关于空间和光谱辐射特性的严格要求。在其先前的科学工作的框架内，申请人已经研究了20多个拉曼活性晶体关于激发SRS促进振动模式的情况，并量化了它们的相互作用强度。在选择了合适的材料后，研制了一套复杂的拉曼激光系统，并在实验室条件下用于二氧化碳的检测。在这些研究的基础上，计划中的项目侧重于拉曼活性材料金刚石，由于其特殊的热和光学特性，特别适合于转换高功率激光辐射，近年来在激光物理学领域迅速崛起。为了将金刚石拉曼激光器应用于痕量气体检测，必须利用现代测量技术分析这些激光源的光谱特性。该项目的主要目标是研制一种波长可调谐的窄线宽金刚石拉曼激光器。为此，将研究一种旨在对激光发射进行光谱控制的新概念。其可行性将通过氨的吸收测量来评估。这项研究作为原理证明，展示了（金刚石）拉曼激光器在光谱应用方面的潜力，特别是促进了其在遥感方面的进一步发展。此外，该项目旨在提供专业知识的协同作用，因为R。悉尼麦考瑞大学的P. Mildier是高功率金刚石拉曼激光器领域的领先团队之一，而申请人在频率稳定技术和用于痕量气体检测的固态激光器方面都有经验。扩大申请人的方法范围将使他能够为未来的气候和环境研究做出重要贡献。