Within Weather Limits
How Much Range Does Bad Weather Take?
Bad weather rarely makes a defensive laser useless at once, but it can shorten the range where enough energy reaches the target.
On this page
- Why water droplets scatter laser energy
- Why range usually falls before failure
- How missiles and guns cover weather gaps
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Introduction
Bad weather rarely makes a defensive laser stop working instantly. The more common effect is that fog, rain, cloud droplets, or sea mist reduce the amount of energy that reaches the target, shortening the distance at which the laser can cause damage. A laser weapon depends on delivering enough concentrated energy to a small spot for long enough to heat, weaken, or destroy part of a threat. When weather removes some of that energy along the way, the weapon may still work, but only at a shorter range. Government assessments of directed-energy weapons consistently identify fog, storms, and other atmospheric conditions as major factors that reduce laser beam quality and effective engagement distance. [GAO]gao.govgao 23 106717fog and stormscan make certain directed energy weapons less effective…. For example, fog and storms can reduce laser beam range and q…
Understanding this effect is important because modern laser air-defence systems are usually designed as part of a layered defence network. Their performance can vary significantly between a clear day and a wet, foggy one, even when the laser hardware itself has not changed. [Naval Postgraduate School]nps.eduNaval Postgraduate SchoolPropagation of High Energy Lasers for Various…HEL performance is strongly affected by various atmospheric eff…
Why Water Droplets Scatter Laser Energy
The key problem is not simply that the atmosphere is wet. It is that fog and rain fill the beam path with countless water droplets that interact with the laser light.
When a high-energy laser travels through clear air, most of its energy continues toward the target. In fog, however, the beam encounters a dense field of tiny suspended droplets. Each droplet can scatter a small amount of light away from the beam’s centreline. Individually these losses may be minor, but millions of droplets along the path can remove a substantial fraction of the energy before it reaches the target. Research on laser propagation through clouds and fog treats these droplets as a major source of attenuation and beam degradation. [Optica+2PubMed]opg.optica.orgPropagation of high energy lasers through cloudsby A Lawrence 2020 Cited by 4 In this section, we present a model for high en…
Fog is often more damaging than rain because of droplet concentration. Rain contains larger droplets, but they are usually spaced farther apart. Dense fog can fill nearly the entire beam path with suspended water particles, creating continuous scattering and reducing transmission over long distances. Studies of atmospheric laser propagation and free-space optical systems repeatedly identify fog as one of the strongest weather-related causes of laser attenuation. [UBC Open Library+2ResearchGate]open.library.ubc.caFigure 2… panying disadvantages, most notably high attenuation by fog and clouds. To…Read more…
Rain creates a similar but somewhat different problem. Raindrops scatter and absorb part of the beam while also introducing fluctuations in beam quality. The result is less power arriving on target and a larger, less concentrated spot. Research into laser propagation in rainfall shows that scattering and absorption by raindrops degrade laser transmission and ranging performance. [Wiley Online Library]onlinelibrary.wiley.comWiley Online LibraryPropagating Characteristics of Pulsed Laser in RainSep 7, 2015 As pulsed laser propagates in rain, the interaction…
Why Range Usually Falls Before Failure
A common misconception is that laser weapons either work or do not work. In reality, atmospheric effects usually create a gradual decline in performance.
Imagine a laser capable of damaging a drone at several kilometres in clear weather. If fog or rain removes part of the beam energy during flight, the target may still receive enough energy to be damaged at shorter distances. What changes first is the maximum effective range, not necessarily the ability to engage at all. This is why military and government analyses generally describe weather as reducing beam range, quality, and effectiveness rather than rendering lasers immediately useless. [GAO]gao.govgao 23 106717fog and stormscan make certain directed energy weapons less effective…. For example, fog and storms can reduce laser beam range and q…
The effect is often compounded by beam spreading. As scattering increases, energy that would have remained concentrated in a small spot becomes distributed over a larger area. Because laser damage depends heavily on energy density, even modest spreading can significantly increase the time required to achieve an effect. A target that could be defeated after a brief dwell time in clear air may require much longer illumination in poor weather, if it can be defeated at all. [Naval Postgraduate School+2ResearchGate]nps.eduNaval Postgraduate SchoolPropagation of High Energy Lasers for Various…HEL performance is strongly affected by various atmospheric eff…
This gradual degradation explains why weather forecasts matter for laser operations. The same system may achieve different engagement ranges from one day to the next because atmospheric transmission conditions have changed. [Naval Postgraduate School]nps.eduNaval Postgraduate SchoolPropagation of High Energy Lasers for Various…HEL performance is strongly affected by various atmospheric eff…
Why Engineers Keep Trying to Reduce the Problem
Military researchers have spent decades trying to make lasers more resilient to atmospheric conditions rather than accepting weather losses as unavoidable.
One approach is careful wavelength selection. Different wavelengths interact differently with water droplets and atmospheric gases, and some propagate more efficiently through certain conditions than others. Another approach uses adaptive optics and beam-control techniques that help keep the beam focused despite atmospheric distortion. Researchers have also explored more experimental methods for clearing or reducing droplet concentrations along a beam path. [arXiv+3ResearchGate+3MDPI]researchgate.netResearchGate(PDF) Wavelength and altitude dependence of laser beam…Jan 13, 2015 Fog and extreme rain are the primary types of weathe…
Even so, no practical military laser has eliminated atmospheric losses entirely. The atmosphere remains part of the weapon system, and weather remains a major operational variable. [Defense Intelligence Agency]dia.milFile IdDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMar 31, 2010 If the HEL beam's propagation path f…
How Missiles and Guns Cover Weather Gaps
The weather sensitivity of lasers helps explain why militaries generally treat them as one layer of defence rather than a complete replacement for conventional weapons.
A missile carries its destructive energy with it. Once launched, it does not need to transmit damaging energy continuously through kilometres of fog or rain. Likewise, anti-aircraft guns rely on physical projectiles that are affected by weather far less than a laser beam. As a result, missiles and guns often retain more predictable performance when visibility deteriorates. [Drill & Defense]drillanddefense.comWeather and atmosphere can reduce effectiveness. Fog, rain, smoke, dust, sea spray, and…Read more…
This does not mean lasers lose their value in poor weather. They can still provide low-cost engagements against drones, rockets, and other threats when atmospheric conditions remain acceptable. The challenge is that commanders cannot assume the same range under all conditions. A laser that forms the outer defensive layer in clear weather may become a shorter-range asset in fog, rain, sea spray, or low cloud. [GAO+2Science.gc.ca]gao.govgao 23 106717fog and stormscan make certain directed energy weapons less effective…. For example, fog and storms can reduce laser beam range and q…
For that reason, modern air-defence concepts increasingly combine lasers with missiles, guns, sensors, and other systems. When weather shrinks the laser’s useful engagement envelope, conventional weapons can cover the gap, ensuring that atmospheric conditions do not create an unprotected corridor for incoming threats. [GAO+2onr.navy.mil]gao.govgao 23 105868Directed Energy Weapons: DOD Should Focus…Apr 17, 2023 The Department of Defense (DOD) is currently developing directed energy…
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Endnotes
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