Princeton University

School of Engineering & Applied Science

Chirped Laser Dispersion Spectroscopy: Fundamentals and Applications

Genevieve Plant
Wednesday, September 28, 2016 - 3:30pm to 5:00pm

The subject of this thesis is the fundamentals, implementation, and applications of Chirped Laser Dispersion Spectroscopy (CLaDS), an alternative dispersion spectroscopy technique that aims to overcome some limitations of absorption-based sensing. Laser based chemical sensors are of importance for a variety of applications in the environmental, industrial, security, and biomedical industries. CLaDS preserves many of the benefits of existing spectroscopic sensing techniques, but it particularly well suited open-path, standoff detection due to its immunity to received intensity and linearity with sample concentration. An introduction to CLaDS, a derivation of the spectroscopic signals, and an analysis of the fundamental noise characteristics are provided, highlighting fundamental similarities and differences to existing sensing technologies. Following this theoretical investigation of ideal CLaDS performance, the technical details, methods of implementation, and component-introduced limitations of real-world CLaDS systems are discussed. Finally, several applications of CLaDS provided. These include atmospheric sensing, distributed sensor networks, and fiber dispersion characterization, all of which aim at demonstrating the technical advantages of the CLaDS technique.