Simulation of the reflection of a high energy laser beam at the sea surface for hazard and risk analyses

Frédéric Schwenger , Adrian Azarian , Michael Henrichsen

Applied Optics +

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June 10, 2024

View abstract on PubMed

Summary

A new analytical model predicts laser reflections off dynamic sea surfaces, crucial for maritime laser safety. It calculates hazard zones and eye-damage risks from wavy conditions, offering faster insights than numerical models.

Area Of Science

Maritime safety
Laser physics
Oceanography

Background

High-energy lasers in maritime settings require safety protocols.
Uncontrolled laser reflections from the sea surface pose risks to personnel and third parties.
Understanding reflected laser energy is vital for developing effective safety measures.

Purpose Of The Study

To develop an analytical model for calculating the spatial intensity distribution of laser beams reflected from a dynamic sea surface.
To identify hazardous areas where laser intensities exceed safety exposure limits.
To calculate the probability of eye-damaging glints for various observer positions, considering sea surface dynamics.

Main Methods

Development of an analytical model incorporating sea surface dynamics (wind speed, direction, fetch) and gravity wave slope statistics.
Calculation of time-averaged spatial intensity distribution of reflected laser energy.
Simulation of observer positions on a hemisphere around the laser spot center.

Main Results

The analytical model accurately predicts the spatial intensity distribution of reflected laser light.
Hazard areas exceeding fixed exposure limits are identified.
Probabilities of potentially eye-damaging glints are calculated for arbitrary observer positions.
The analytical model demonstrates significantly faster computation times compared to previous numerical models.

Conclusions

The presented analytical model is a critical tool for maritime laser safety, enabling risk analysis.
The model's ability to account for sea surface dynamics and observer positions provides a unique capability for assessing laser hazards.
The computational efficiency of the analytical model makes it advantageous for real-time safety applications.