Tunable IR Lasers for Gas-Phase Sensing

用于气相传感的可调谐红外激光器

• 批准号: 0515547
• 负责人: Steven R. J. Brueck
• 金额: --
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-15 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0515547&HistoricalAwards=false
• 关键词: Tunable; IR; Lasers; Gas; Phase

ABSTRACTNSF- 0515547Brueck, StevenHigh spectroscopic quality, compact, robust, semiconductor-based tunable laser sources across the mid-IR, 3 - 12 Pm, would dramatically enhance the capabilities of active point and remote sensors Recent progress in semiconductor materials and lasers offers opportunities for continuously tunable, high spectral purity, high-power sources covering the entire IR molecular fingerprint region including the critical 3-5 Pm and 8-12 Pm atmospheric windows. Optically pumped, high-power semiconductor laser sources, have recently been developed across the IR. These applications typically demand high beam quality, "power-in-a-bucket" performance with only coarse wavelength control. In contrast, spectroscopic applications put a premium on spectral quality and agility with less emphasis on broadband power. The primary objectives of this program are to develop the integrated spectral control technologies necessary for robust and agile spectroscopic use of these sources and to demonstrate their utility for sensors.In a collaboration between UNM and AFRL, the Air Force Research Laboratory, preliminary work has demonstrated that the linewidth of lasers can be dramatically reduced by the use of a distributed feedback (DFB) grating structure. In this research, variations in the design and in the parameters of this structure will be investigated with emphases on narrow linewidth, high-power operation, and continuous, single-frequency tuning over a large wavelength range. For optically pumped devices, additional degrees of freedom are available since the gain stripe is defined by the optical configuration and is totally flexible. A transversely chirped grating can be used to provide for continuous tuning. This is a totally new concept for the tuning of semiconductor lasers and forms the basis of the planned investigation. Based on the demonstrated gain-bandwidth of this laser system, continuous tuning ranges of several hundreds of cm -1 are anticipated - far in excess of that available by any other technique.This program will support one student and one postdoctoral researcher. UNM is a Hispanic ServingInstitution with large populations of Hispanic and Native American students. The PI already has strong interactions with recruiting efforts in the Native American community.

摘要：Brueck，Steven 跨中红外（3 - 12 Pm）的高光谱质量、紧凑、坚固、基于半导体的可调谐激光源将显着增强有源点和远程传感器的功能半导体材料和激光器的最新进展为覆盖整个红外分子的连续可调谐、高光谱纯度、高功率源提供了机会 指纹区域包括关键的 3-5 Pm 和 8-12 Pm 大气窗口。最近在红外领域开发了光泵浦高功率半导体激光源。这些应用通常需要高光束质量、“桶中功率”性能以及仅粗波长控制。相比之下，光谱应用更注重光谱质量和敏捷性，而不太重视宽带功率。该计划的主要目标是开发稳健、灵活的光谱使用这些光源所必需的集成光谱控制技术，并展示其对传感器的实用性。在新墨西哥大学和空军研究实验室 AFRL 的合作中，初步工作表明，通过使用分布式反馈 (DFB) 光栅结构可以显着减小激光器的线宽。在这项研究中，将研究该结构的设计和参数的变化，重点是窄线宽、高功率运行以及大波长范围内的连续单频调谐。对于光泵浦器件，由于增益带由光学配置定义并且完全灵活，因此可以获得额外的自由度。横向啁啾光栅可用于提供连续调谐。这是半导体激光器调谐的全新概念，并构成了计划研究的基础。根据该激光系统所展示的增益带宽，预计连续调谐范围可达数百 cm -1 - 远远超过任何其他技术可用的范围。该计划将支持一名学生和一名博士后研究员。新墨西哥州是一所西班牙裔服务机构，拥有大量西班牙裔和美国原住民学生。 PI 已经与美洲原住民社区的招聘工作建立了密切的互动。