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Within Fog Range

Why Seeing a Target Is Not Enough

A target can remain easy to see through fog while the laser no longer delivers enough concentrated energy to damage it.

On this page

  • Visibility versus destructive energy density
  • How partial beam losses change damage thresholds
  • Why tracking can succeed after lethality fails
Preview for Why Seeing a Target Is Not Enough

Introduction

A target can remain clearly visible through fog and still survive a laser engagement because visibility and destructive effect are not the same thing. Human eyes, cameras, and tracking sensors need only a small amount of reflected light to detect and follow an object. A high-energy laser, by contrast, must deliver a large amount of energy into a very small spot for long enough to heat, weaken, melt, or otherwise damage the target. Fog can reduce that concentrated energy delivery long before it makes the target disappear from view. [GAO]gao.govScience & Tech Spotlight: Directed Energy WeaponsScience & Tech Spotlight: Directed Energy WeaponsMay 25, 2023 — Directed energy weapons—such as lasers—use energy fired at the speed o…Published: May 25, 2023

Visible Targets illustration 1 This distinction is one of the most important practical limits on laser weapons. In foggy conditions, operators may still see and track a drone, missile, or aircraft, yet the beam arriving at the target may no longer exceed the damage threshold needed for a successful engagement. The result is a target that remains visible but survives.

Visibility Versus Destructive Energy Density

The central misunderstanding is to treat seeing a target and damaging a target as equivalent optical problems. They are not.

A camera can identify an object using only a tiny fraction of the light reflected from it. Modern sensors are designed to extract useful information from weak signals. A laser weapon, however, functions by depositing energy. Its effectiveness depends on irradiance—the amount of power concentrated into a given area on the target surface—and on maintaining that concentration for a sufficient dwell time. [onr.navy.mil]onr.navy.milOpen source on navy.mil.

Fog attacks the energy-delivery requirement directly. Water droplets scatter and absorb part of the beam as it travels through the atmosphere. Even if enough light survives the journey for a sensor to see the target, the surviving energy may be too weak or too dispersed to produce the required heating effect. [IJAST+2ResearchGate]ijast.orgThe Detection Capability of Laser Fuze in Fog, Mist, and…The key optical phenomena which influence the detection performance of l…

An everyday comparison is a magnifying glass. A bright patch of sunlight on paper is easy to see, but only a tightly focused spot can ignite the paper. If the light becomes spread out, visibility remains while the burning effect disappears. Fog produces a similar outcome for laser weapons by reducing the intensity concentrated on the target.

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How Partial Beam Losses Change Damage Thresholds

Laser damage is governed by thresholds rather than simple detection.

Materials generally require a minimum energy density before meaningful damage begins. Below that threshold, the target merely warms slightly or experiences negligible effects. Above it, heating can accelerate rapidly and lead to structural failure, sensor damage, ignition, or other intended outcomes. [RP Photonics]rp-photonics.comRP Photonics Laser-induced DamageRP PhotonicsLaser-induced DamageDecember 11, 2025 — by R Paschotta · 2014 · Cited by 2 — Laser-induced damage occurs in optical component…Published: December 11, 2025

This creates an important asymmetry. A modest reduction in beam power can produce a disproportionately large reduction in lethality.

Consider the chain of events:

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  1. Fog scatters and absorbs part of the outgoing beam.
  2. Less power reaches the target.
  3. The beam spot may become less concentrated.
  4. Surface heating slows dramatically.
  5. The target remains below its damage threshold.

The target therefore survives even though the beam still arrives and may even be visible on the target surface. Research on atmospheric laser propagation consistently identifies fog as one of the strongest causes of attenuation because droplet sizes interact efficiently with optical wavelengths used in many laser systems. [MDPI+2ResearchGate]mdpi.comLaser Beam Atmospheric Propagation Modelling for…by T Fahey · 2021 · Cited by 103 — In this paper, the atmospheric radiative trans…

This threshold behaviour explains why reports of laser performance often focus on “effective range” rather than maximum visible range. The distance at which the target can be seen may remain far greater than the distance at which enough energy can be delivered to achieve damage.

Visible Targets illustration 2

Why Tracking Can Succeed After Lethality Fails

Tracking systems and weapon effects have different performance requirements.

Many laser weapon systems use separate sensors for acquisition, identification, and beam control. Those sensors can often continue functioning when atmospheric conditions have already reduced the weapon beam’s effectiveness. Industry descriptions of operational laser systems routinely distinguish detection, tracking, identification, and defeat as separate functions rather than a single process. [RTX]rtx.comHigh-Energy Lasers | RaytheonThis directed energy technology enables detection of threats, tracking during maneuvers, and positive vis…

As fog thickens, the sequence often unfolds like this:

  • Detection still works because some reflected light reaches the sensor.
  • Tracking still works because the target remains distinguishable from the background.
  • Aim-point control may still function.
  • Destructive heating begins to weaken because less energy reaches the target.
  • Eventually lethality fails even though tracking continues.

This creates a potentially misleading operational picture. Operators may have excellent awareness of the target’s position and motion while lacking sufficient beam intensity to disable it. The engagement appears successful from a tracking perspective but unsuccessful from a damage perspective. [LinkedIn]linkedin.comTechnical Evolution and Operational Integration of Directed…Directed-energy performance claims are especially sensitive to ran…

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The Dwell-Time Problem

When fog reduces delivered energy, one theoretical solution is simply to keep the laser on target longer.

In practice, this approach quickly encounters limits. Directed-energy analyses emphasise that laser weapons must accumulate enough energy on a target over a finite dwell time. As atmospheric losses increase, the required dwell time grows. [Air and Space Power Centre]airpower.airforce.gov.auAir and Space Power Centre Directed Energy WeaponsAir and Space Power CentreDirected Energy Weapons - Air and Space Power CentreAtmospheric weather conditions (eg cloud, rain, fog, changi…

A target that might be damaged after a brief exposure in clear air may require a much longer exposure in fog. That creates several operational problems:

  • Platform vibration becomes more significant.
  • Multiple threats cannot be engaged simultaneously.
  • The target may leave the engagement zone before sufficient energy is deposited.

The key point is that fog does not necessarily stop all energy from arriving. Instead, it can reduce delivery enough that the required exposure time becomes tactically unrealistic. The target survives not because the laser is absent, but because the damage process becomes too slow. [Air and Space Power Centre]airpower.airforce.gov.auAir and Space Power Centre Directed Energy WeaponsAir and Space Power CentreDirected Energy Weapons - Air and Space Power CentreAtmospheric weather conditions (eg cloud, rain, fog, changi…

Visible Targets illustration 3

Why This Matters for Assessing Laser Weapon Performance

Claims that a laser can still “see,” “illuminate,” or “track” a target through fog should not automatically be interpreted as proof that it can still destroy that target.

A laser engagement succeeds only when sufficient energy reaches a sufficiently small spot for long enough to exceed the target’s damage threshold. Fog often degrades this energy concentration faster than it degrades visibility. Consequently, a drone, missile, or aircraft may remain easy to detect and follow while becoming increasingly difficult to damage. Drill & Defense+2Air and Space Power Centre [drillanddefense.com]drillanddefense.comWeather and atmosphere can reduce effectiveness. Fog, rain, smoke, dust, sea spray, and…Read more…

This is the critical mechanism behind the apparent paradox of foggy laser engagements: seeing a target is a sensing problem, but defeating it is an energy-delivery problem. Fog can leave the first largely intact while undermining the second. [IJAST+2ResearchGate]ijast.orgThe Detection Capability of Laser Fuze in Fog, Mist, and…The key optical phenomena which influence the detection performance of l…

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Endnotes

  1. Source: gao.gov
    Title: Science & Tech Spotlight: Directed Energy Weapons
    Link: https://www.gao.gov/products/gao-23-106717
    Source snippet

    Science & Tech Spotlight: Directed Energy WeaponsMay 25, 2023 — Directed energy weapons—such as [lasers]({{ 'lasers/' | relative_url }})—use energy fired at the speed o...

    Published: May 25, 2023

  2. Source: onr.navy.mil
    Link: https://www.onr.navy.mil/organization/departments/code-35/division-353/directed-energy-weapons-cdew-and-high-energy-lasers

  3. Source: ijast.org
    Link: https://ijast.org/volume-4-issue-1-article-5-2/
    Source snippet

    The Detection Capability of Laser Fuze in Fog, Mist, and...The key optical phenomena which influence the detection performance of l...

  4. Source: researchgate.net
    Link: https://www.researchgate.net/publication/403676537Laser-Based_Directed_Energy_Weapons_Technological_Capabilities_Material_Interaction_and_Strategic[Deployment
    Source snippet

    (PDF) Laser-Based Directed Energy WeaponsFog and Rain Absorption: Water droplets significantly absorb and scatter energy; dense fog may r...

  5. Source: rp-photonics.com
    Title: RP Photonics Laser-induced Damage
    Link: https://www.rp-photonics.com/laser_induced_damage.html
    Source snippet

    RP PhotonicsLaser-induced DamageDecember 11, 2025 — by R Paschotta · 2014 · Cited by 2 — Laser-induced damage occurs in optical component...

    Published: December 11, 2025

  6. Source: mdpi.com
    Link: https://www.mdpi.com/2073-4433/12/7/918
    Source snippet

    Laser Beam Atmospheric Propagation Modelling for...by T Fahey · 2021 · Cited by 103 — In this paper, the atmospheric radiative trans...

  7. Source: researchgate.net
    Link: https://www.researchgate.net/publication/275984927_Attenuation_of_laser_fuse_through_fog
    Source snippet

    Attenuation of laser fuse through fogTheory analysis and experimental results indicate that the laser beam is dependent on the visibiliti...

  8. Source: rtx.com
    Link: https://www.rtx.com/raytheon/what-we-do/integrated-air-and-missile-defense/lasers
    Source snippet

    High-Energy Lasers | RaytheonThis directed energy technology enables detection of threats, tracking during maneuvers, and positive vis...

  9. Source: linkedin.com
    Link: https://www.linkedin.com/pulse/technical-evolution-operational-integration-light-based-robi-sen-hhdoc
    Source snippet

    Technical Evolution and Operational Integration of Directed...Directed-energy performance claims are especially sensitive to ran...

  10. Source: researchgate.net
    Link: https://www.researchgate.net/publication/307435846_Atmospheric_Propagation_of_High-Energy_Laser_Beams
    Source snippet

    (PDF) Atmospheric Propagation of High-Energy Laser BeamsLaser sources are widely used for exploring the atmosphere, in particular, its ga...

  11. Source: researchgate.net
    Link: https://www.researchgate.net/publication/399863884_Laser-Based_Directed_Energy_Weapons_Technological_Capabilities_Material_Interaction_and_Strategic_Deployment_Pathways
    Source snippet

    (PDF) Laser-Based Directed Energy WeaponsJan 30, 2026 — Atmospheric propagation remains a primary performance constraint, while mitigatio...

  12. Source: photonics.com
    Link: https://www.photonics.com/Articles/High-Laser-Induced-Damage-Threshold-Optics/a46171
    Source snippet

    High Laser-Induced-Damage Threshold OpticsLasers can cause a lot of damage to optical coatings, and buyers of optics would do well to und...

  13. Source: gao.gov
    Link: https://www.gao.gov/video/directed-energy-weapons-dod-should-focus-transition-planning
    Source snippet

    Directed Energy Weapons DOD Should Focus on Transition...DOD spends about $1 billion annually on directed energy--concentrated electroma...

  14. Source: airpower.airforce.gov.au
    Title: Air and Space Power Centre Directed Energy Weapons
    Link: https://airpower.airforce.gov.au/sites/default/files/2021-03/BPAF03_Directed-Energy-Weapons.pdf
    Source snippet

    Air and Space Power CentreDirected Energy Weapons - Air and Space Power CentreAtmospheric weather conditions (eg cloud, rain, fog, changi...

  15. Source: drillanddefense.com
    Link: https://drillanddefense.com/laser-weapons-the-new-layer-in-modern-air-defense/
    Source snippet

    Weather and atmosphere can reduce effectiveness. Fog, rain, smoke, dust, sea spray, and...Read more...

  16. Source: Wikipedia
    Title: Laser weapon
    Link: https://en.wikipedia.org/wiki/Laser_weapon
    Source snippet

    Laser weaponA laser weapon is a type of directed-energy weapon (DEW) that uses lasers to inflict damage. Laser weapons are of two type...

Additional References

  1. Source: aspistrategist.org.au
    Title: war at the speed of light the emerging role of directed energy weapons
    Link: https://www.aspistrategist.org.au/war-at-the-speed-of-light-the-emerging-role-of-directed-energy-weapons/
    Source snippet

    the emerging role of directed-energy weapons15 Apr 2026 — atmospheric effects can reduce the effectiveness of high energy lasers, and the...

  2. Source: eureka.patsnap.com
    Title: report atmospheric effects on long range [laser power]({{ ‘power-costs/’ | relative_url }}) transmission
    Link: https://eureka.patsnap.com/report-atmospheric-effects-on-long-range-laser-power-transmission
    Source snippet

    PatSnap EurekaAtmospheric Effects On Long-Range Laser Power...28 Aug 2025 — Weather conditions dramatically affect transmission efficien...

  3. Source: c4isrnet.com
    Title: cloudy and a chance of rain need not sideline high energy lasers
    Link: https://www.c4isrnet.com/opinion/2018/02/26/cloudy-and-a-chance-of-rain-need-not-sideline-high-energy-lasers/
    Source snippet

    Cloudy and a chance of rain need not sideline high-energy...Feb 26, 2018 — As such, while certain effects of a laser weapon are negative...

  4. Source: army.mil
    Title: developing lasers that pierce fog dust to destroy targets
    Link: https://www.army.mil/article/195650/army_developing_lasers_that_pierce_fog_dust_to_destroy_targets
    Source snippet

    Army developing lasers that pierce fog, dust to destroy targets23 Oct 2017 — A lot of people think that high-energy lasers, or HELs, can'...

  5. Source: spiedigitallibrary.org
    Link: https://www.spiedigitallibrary.org/proceedings/Download?downloadType=proceedings+article&isResultClick=True&urlId=10.1117%2F12.2037779
    Source snippet

    olecules and salt, especially in adverse weather conditions, such as fog, rain...

  6. Source: ndupress.ndu.edu
    Title: directed energy weapons are real and disruptive
    Link: https://ndupress.ndu.edu/Media/News/News-Article-View/Article/2053280/directed-energy-weapons-are-real-and-disruptive/
    Source snippet

    And DisruptiveJan 9, 2020 — In this case, the laser weapon system would sense the atmospheric conditions... [beam quality]({{ 'beam-quality/' | relative_url }}) can also help t...

  7. Source: facebook.com
    Link: https://www.facebook.com/groups/474884840305370/posts/1059982271795621/
    Source snippet

    range and effectiveness. Precision: pointing stability and...Read more...

  8. Source: scienceandglobalsecurity.org
    Link: https://scienceandglobalsecurity.org/archive/sgs18stupl.pdf
    Source snippet

    This method applies physics-based models, which have been...Read more...

  9. Source: laserwars.net
    Title: navy laser weapons challenges atmosphere fog
    Link: https://www.laserwars.net/p/navy-laser-weapons-challenges-atmosphere-fog
    Source snippet

    Fog of War: The Biggest Challenge for Naval Laser Weapons22 May 2025 — Welcome to the literal fog of war, where high-energy lasers run fa...

    Published: May 2025

  10. Source: laserwars.net
    Title: us military laser weapons fielding timeline
    Link: https://www.laserwars.net/p/us-military-laser-weapons-fielding-timeline
    Source snippet

    The Pentagon Wants to Field Laser Weapons Within 3 Years16 Mar 2026 — The US military plans on fielding laser weapons at scale within the...

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