I. I. Zasavitskii

Tunable diode laser spectroscopy accessories based on middle IR halide and chalcogenide fibers

The use of mid-IR fiberoptic components in spectroscopy and analysis using A4B6 tunable diode lasers has been studied, and the results are reported. Spectral parameters of the fibers and complete spectroscopic systems based on the fibers and Pb-salt diode lasers are presented. The further development of the presented systems for applications in remote monitoring, multicomponent gas mixtures analysis, and evanescent wave spectroscopy of gases is addressed.

Spectral gas analysis of polyatomic molecules by tunable diode lasers

The application of high-resolution tunable diode laser spectroscopy to the trace gas analysis of polyatomic molecules is experimentally investigated. A trace detection limit of 10 exp -8 vol pct was obtained for Freon-12, allowing the concentration of this gas in the atmosphere to be measured.

Middle-infrared fiber optic accessories for molecular spectroscopy and gas analysis with tunable diode lasers

A highly sensitive chemical analyzer of molecular gases is presented. It is based on measurements of molecular absorption in high resolution spectra obtained with infrared tunable diode lasers (TDL). To transmit radiation from lasers to an analytical cell and back from the cell to detectors, infrared fibers with low optical losses are used. A multipass optical cell is used to enhance a sensitivity of the sensor. Various gaseous molecular objects could be detected by this analyzer due to wide spectral range of available TDLs and fibers. Use of fibers for laser radiation transfer could provide remote monitoring, multicomponent mixture analysis, and evanescent wave spectroscopy of gases in the near future.