Instrumentation for Multiplex Spectroscopic Sensing. Appendix A: spectroscopic Diagnosis of Chemical Processes: Applications of Optical Parametric Oscillators. Appendix B: Optical Heterodyne Signal Generation and Detection in Cavity Ringdown Spectroscopy based on a Rapidly Swept Cavity

摘要

To develop novel radiation techniques for remote spectroscopic sensing applications of interest to the USAF. The general technological context of this project is in the area of tunable lasers and nonlinear-optical devices that can be applied to spectroscopic sensing of gases in the atmosphere or elsewhere. This is applicable in various forms of remote sensing such as long- path absorption or DIAL/Lidar (ground-based, airborne or satellite-based). Another useful approach comprises probe-based sensing, in which a central control unit is connected optoelectronically to one or more optical probe modules that can sample traces of specific gases in industrial or environmental settings. Attainment of objectives in these areas met with mixed success. Progress on a proposed novel approach to multiple-wavelength remote sensing has been disappointingly slow, with many technical problems still to be solved. Offsetting this negative outcome is highly satisfactory progress in developing another innovative laser-spectroscopic technique that is amendable to probe- based sensing.