Research of laser scintillation effect based on physical simulation turbulent system

Xin-ji Gan; Jin Guo

doi:10.1117/12.901032

22 August 2011 Research of laser scintillation effect based on physical simulation turbulent system

Xin-ji Gan, Jin Guo

Proceedings Volume 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging; 81923W (2011) https://doi.org/10.1117/12.901032
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

A turbulent simulating device in inner field, which is used to research the process of laser propagation in atmospheric turbulent, could avoid to be disturbed by many casual factors from the atmosphere disturb. For the sake of eliminating uncertainty of the atmosphere disturb, a physical simulation turbulent system using phase plates based on Kolmogorov spectrum is designed to carry out a beam spot scintillation experiment of laser propagation. The physical simulation turbulent system employs two phase plates with micro-fabricated surfaces with the characteristic of Kolmogorov spectrum. The formula of simulated atmospheric coherent length of the optical system is given for the motive of adjusting different turbulent conveniently. With the movement in a cone-shape path optical system, the different coherence length to simulate atmospheric turbulent can continuously be adjusted in a wide range. In the experiment of beam spot scintillation, a He-Ne laser of 632.8 nm wavelength with 3.5 mm beam diameter is adopted as the propagation source, which is expanded to 10mm diameter with the expanded lens. The beam passes through all the optical element of the whole turbulent simulation system in sequence. Finally the beam spot reaches the CCD for picking spot images and the detector of laser energy meter for collecting the power of spot scintillation. When the distance between the phase and field lens is adjusted to a longer simulated coherent length, it is observed that whole spot is fractured due to serious phase aberration. We measured the power of spot in one rotation period of the phase plate. The normalized power amplitude distribution histogram and the normalized logarithm power amplitude distribution histogram of the intensity scintillation data in the experiment are given in the paper.

Citation Download Citation

Xin-ji Gan and Jin Guo "Research of laser scintillation effect based on physical simulation turbulent system", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 81923W (22 August 2011); https://doi.org/10.1117/12.901032

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KEYWORDS

Scintillation

Optical simulations

Atmospheric propagation

Atmospheric physics

Laser beam propagation

Turbulence

Atmospheric optics

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