Influence of Beam Parameters on Propagation of Blue Green Laser Underwater

Abstract

Abstract: The blue-green spectrum in the range of 450$\sim$550 nm is the only low loss optical window of seawater.
Due to the absorption and scattering of water, the underwater propagation of the laser beam will
have time-space expansion and waveform distortion. Based on Monte Carlo simulation, the propagation
characteristics of blue-green laser in seawater have been analyzed, especially the influence of laser
emission parameters on the distribution of receiving light field. By adjusting the beam parameters
of the transmitter and focusing the laser beam in advance, the influence of beam diffusion caused
by underwater transmission can be eliminated to some extent. The analysis and simulation results
show that when the pre-focusing angle is equal to the small angle scattering eigenvalue of water,
a flat transmission area with slow spread of laser beam can be formed in Jerlov type IB water before
the designed focus distance. When the pre-focusing angle is greater than twice
the scattering angle
of water, the convergence effect can be formed near the designed focus distance, and the focus effect
is proportional to the pre-focusing angle. When the water quality becomes worse, the corresponding
effective focus distance becomes shorter. The research results provide a new way to improve the
transmission characteristics of blue-green laser signal in seawater.

Key words: blue-green laser, Monte Carlo simulation, beam pre-focusing, scattering, ocean propagation characteristics

CLC Number:

TN929.1

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