Abstract

Turbulence noise in dual-wavelength long-path laser absorption spectrometers is analyzed with the aid of weak turbulence theory, and results are compared with experimental CO₂ laser beam transmission data. Spectrometers with finite-sized transmitter and receiver apertures are considered, where noise reduction is sought simultaneously through aperture averaging and by taking advantage of the correlation that exists between turbulence-related perturbations at the two wavelengths. Variance, scintillation spectra, and correlation properties for single- and dual-wavelength propagation are discussed as functions of receiver apertures, and the possible role of attenuation scintillation is also assessed.

© 1982 Optical Society of America

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