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

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.

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:

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.

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:

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…

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:

• The target may manoeuvre.
• Tracking errors accumulate.

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…

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…

Amazon book picks

Further Reading

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Directed Energy Weapons

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Directly addresses energy delivery and target damage mechanisms.

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Introduction to adaptive optics

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Shows how beam quality improvements differ from restoring lost energy.

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Fundamentals of Photonics, 2 Volume Set

By Bahaa E. A. Saleh, Malvin Carl Teich

First published 2019. Subjects: Photonics.

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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

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/

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

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

Published: December 11, 2025

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

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

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

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

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

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

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

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

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

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

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Title: Laser weapon
Link:https://en.wikipedia.org/wiki/Laser_weapon

Additional References

17. 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/

18. 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

19. 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/

20. 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

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

22. 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/

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

24. Source: scienceandglobalsecurity.org
Link:https://scienceandglobalsecurity.org/archive/sgs18stupl.pdf

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

Published: May 2025

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