Short-exposure imaging and short-term laser beam spread in a turbulent atmosphere

Mikhail I. Charnotskii

doi:10.1117/12.279026

23 September 1997 Short-exposure imaging and short-term laser beam spread in a turbulent atmosphere

Mikhail I. Charnotskii

Proceedings Volume 3125, Propagation and Imaging through the Atmosphere; (1997) https://doi.org/10.1117/12.279026
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The theory of short-exposure (SE) imaging and short-term (ST) beam spread is developed based on the Markov approximation for wave propagation in turbulence and Feymnan path-integral formalism. The theory is not restricted by the weak scintillation conditions, and takes into account diffraction and geometric properties ofthe beam and imaging system. We obtain approximations for the ST beam and SE image structure functions, which are free from the drawbacks ofthe classical SE theory. The SE case modulation transfer function (MiT) has a two-scale shape with larger scale extending up to the diffraction cutoff. We show that the imaging system can be optimized to maintain the highest contrast for the given spatial frequency. The initial beam size and its focusing can be optimized in terms ofthe maximum on-axis intensity and minimum beam size. These effects have no analogy for the long-term cases.

Citation Download Citation

Mikhail I. Charnotskii "Short-exposure imaging and short-term laser beam spread in a turbulent atmosphere", Proc. SPIE 3125, Propagation and Imaging through the Atmosphere, (23 September 1997); https://doi.org/10.1117/12.279026

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