Within Dwell Time
Why Moving Drones Are Hard Laser Targets
A drone that rolls, vibrates, or changes direction can spread laser energy across its surface instead of absorbing it in one place.
On this page
- Why visibility is easier than aim point control
- How roll, yaw, vibration, and acceleration move the vulnerable spot
- What tracking systems must solve before heating can accumulate
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Introduction
A laser weapon does not defeat a target simply because the beam reaches it. The crucial challenge is keeping enough energy focused on the same vulnerable spot for long enough to cause damaging heating. Against a stationary object, that is already difficult. Against a manoeuvring drone or missile, it becomes far harder because the target itself continuously moves the desired aim point. A drone may remain fully visible to sensors while the specific rotor arm, control surface, sensor housing or structural weak point that the laser is trying to heat shifts by centimetres or metres in fractions of a second. When that happens, energy that should have accumulated in one location is spread across multiple locations, reducing peak temperature and slowing damage. Defence research and operational laser programmes consistently identify tracking accuracy, beam control and dwell time as central requirements for successful engagements against moving aerial targets. [Defense Intelligence Agency+2RTX]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
Why Visibility Is Easier Than Aim-Point Control
A common misunderstanding is that once a laser weapon can see a drone, the engagement problem is largely solved. In reality, detection and destruction are different tasks.
A tracking sensor only needs to know where the target is. A damaging laser must know where a specific part of that target is and then keep the beam on that location despite continuous motion. High-energy laser systems depend on sustained thermal loading. Defence studies often compare the process to holding a blowtorch on one spot rather than striking a target with a projectile. The beam arrives instantly, but the damage takes time to accumulate. Defense Intelligence Agency+2Air and Space Power Centre [dia.mil]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
This distinction matters because aerial targets rarely present a perfectly stable surface. Even a drone flying in a straight line experiences vibration from motors, airframe flexing and control corrections. From the laser’s perspective, the desired aim point is constantly moving. Every small deviation forces the beam-control system to make corrections. If those corrections lag behind the target motion, the laser spot wanders and the heating process becomes less efficient. [DLR Electronic Library+2QinetiQ]elib.dlr.deDLR Electronic LibrarySetup of a Beam Control System for High Power Laser…October 14, 2016 — by I Buske · 2016 · Cited by 1 — We inves…
The result is that a target can remain clearly visible while still avoiding effective thermal damage simply because the beam cannot stay fixed on the same location long enough.
How Roll, Yaw, Vibration and Acceleration Move the Vulnerable Spot
The difficulty is not merely that the target moves through space. The target’s own motions continually change the geometry of the engagement.
Roll Rotates the Aim Point Away
Consider a quadcopter drone. A laser may be attempting to heat a motor housing or rotor arm. If the drone rolls during a manoeuvre, that component rotates around the airframe. The laser control system must recognise the change, predict where the component will appear next and reposition the beam accordingly.
Even if the drone’s centre remains accurately tracked, the vulnerable component may have shifted significantly. Energy that was beginning to accumulate in one location can suddenly be distributed over a wider area. Instead of one hot spot approaching failure temperature, several warm spots develop without any of them reaching a destructive threshold. [Defense Intelligence Agency]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
Yaw Changes What the Laser Sees
Yaw presents a related problem. When a drone rotates around its vertical axis, different surfaces become exposed to the beam.
A component that was directly visible moments earlier may become partially obscured or present a different angle. The laser may now strike a more reflective, more thermally resistant or simply less vulnerable surface. The heating process effectively starts over because the beam is no longer depositing energy into the same material volume.
Vibration Creates Continuous Beam Slip
Small unmanned aircraft generate constant vibration from propellers, motors and aerodynamic disturbances. Although these motions may appear insignificant to a human observer, they can be important when a laser is attempting to maintain a tiny, concentrated spot.
A beam that jitters across a target surface spreads its energy over a larger area. Since temperature rise depends heavily on energy concentration, even modest motion can reduce heating efficiency. Beam-control experiments and tracking research repeatedly focus on pointing accuracy because very small angular errors become meaningful at engagement ranges. [DLR Electronic Library]elib.dlr.deDLR Electronic LibrarySetup of a Beam Control System for High Power Laser…October 14, 2016 — by I Buske · 2016 · Cited by 1 — We inves…
Acceleration Breaks Prediction
Modern tracking systems do not merely observe target position; they also predict future position. This is necessary because sensors, computers and steering mechanisms all introduce delays.
When a drone suddenly accelerates, brakes or changes direction, those predictions become less accurate. The laser beam may briefly lag behind the desired aim point. Even short interruptions can reduce heating effectiveness because thermal energy begins spreading away from the previously heated region. The system must then re-establish alignment and rebuild temperature. [Defense Intelligence Agency+2engrxiv.org]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
Why Brief Aim-Point Slips Can Reset the Heating Process
Laser engagements are often described in terms of dwell time—the period during which sufficient energy remains concentrated on the target.
What matters is not simply total energy delivered but how continuously that energy is applied to the same location. If the beam repeatedly slips away from the intended spot, the target material has opportunities to conduct heat into surrounding regions or lose heat to airflow. The next burst of energy is therefore not always building on the previous one as efficiently as operators would like. Defense Intelligence Agency+2Air and Space Power Centre [dia.mil]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
An intuitive comparison is heating metal with a torch. Holding the flame on one location eventually produces failure. Moving the flame around spreads the heat and dramatically increases the time required to achieve the same effect. High-energy lasers face a similar challenge when tracking manoeuvring aerial targets. [Defense Intelligence Agency]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
This is why laser weapon evaluations often focus on time-to-kill rather than merely laser power. A more powerful laser can compensate for some tracking imperfections, but persistent aim-point instability still reduces efficiency because the energy is not concentrated where it is most useful. [Defence Science Review]com.plpdf 216776 135052Defence Science ReviewDEFENCE SCIENCE REVIEWJanuary 17, 2026 — by A Karkadakattil · 2026 · Cited by 1 — The effectiveness of laser-based…
What Tracking Systems Must Solve Before Heating Can Accumulate
The tracking problem is more demanding than simply keeping a target inside a sensor frame.
Modern directed-energy systems require several functions to operate simultaneously:
- Detect and identify the target.
- Maintain precise tracking of its position and motion.
- Predict future movement.
- Stabilise the beam director.
- Correct atmospheric distortion.
- Keep the laser spot on the desired aim point despite target manoeuvres. [RTX+2AIAA Journals]rtx.comHigh-Energy Lasers | RaytheonRaytheon's high-energy laser systems use photons, or particles of light, to carry out military missions a…
Each task becomes harder when the target is moving aggressively. Atmospheric turbulence may already be pushing the beam away from the desired location. The target’s own motion adds another layer of error. Adaptive-optics systems can compensate for some atmospheric distortions, but they do not eliminate the need for highly accurate target tracking and beam steering. [AIAA Journals+2NATO Publications]arc.aiaa.orgAIAA JournalsAdaptive Optics for Directed Energy: Fundamentals and…by RB Holmes · 2022 · Cited by 28 — Adaptive optics are beneficial…
This explains why beam directors, stabilised turrets, tracking sensors and fire-control software occupy such a prominent role in directed-energy development. The laser source itself is only one part of the engagement system. The ability to maintain precise aim on a moving target often determines whether heating accumulates fast enough to produce a practical effect. [L3Harris® Fast. Forward.+2Lockheed Martin]l3harris.com® FastForward.L3Harris Directed Energy Beam Directors – A Key…22 Jun 2023 — Directed energy and high-energy laser weapon systems have the po…
Why Moving Drones Remain a Demanding Laser Target
The image of a laser instantly destroying a drone can obscure the real engineering challenge. The beam reaches the target at the speed of light, but the target is not standing still waiting to absorb energy.
A manoeuvring drone rolls, yaws, vibrates and changes direction while atmospheric turbulence simultaneously perturbs the beam. The weapon must therefore solve two problems at once: keeping the beam accurately pointed and keeping it fixed on the correct part of a target that is continuously changing its orientation and position. When either task falters, energy spreads across the airframe instead of accumulating in a single vulnerable location. [Defense Intelligence Agency+2AIAA Journals]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
For that reason, visibility is only the beginning of a laser engagement. The decisive challenge is maintaining aim-point heating long enough for damage to build faster than motion, cooling and tracking errors can disperse it. [Defense Intelligence Agency+2inss.ndu.edu]dia.milDefense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require…
Amazon book picks
Further Reading
Books and field guides related to Why Moving Drones Are Hard Laser Targets. Use these as the next step if you want deeper reading beyond the article.
Directed Energy Weapons
Explains high-energy laser propagation target interaction and field limitations that shape moving-target performance.
Military laser technology for defense
Provides the optical and system-level background needed to understand tracking stabilisation and laser defence roles.
Introduction to adaptive optics
First published 2000. Subjects: Adaptive Optics, Optical detectors, Optical instruments, Optical measurements, Optics, Adaptive.
An Introduction to Laser Weapon Systems
Covers laser weapon engagement mechanics including tracking beam control and target effects relevant to moving drones.
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Endnotes
-
Source: rtx.com
Link: https://www.rtx.com/raytheon/what-we-do/integrated-air-and-missile-defense/lasersSource snippet
High-Energy Lasers | RaytheonRaytheon's high-energy laser systems use photons, or particles of light, to carry out military missions a...
-
Source: elib.dlr.de
Link: https://elib.dlr.de/106618/1/20160926%20f%20IB%20-%20Manuscript%20-%20SPIE%20Edinburgh.pdfSource snippet
DLR Electronic LibrarySetup of a Beam Control System for High Power Laser...October 14, 2016 — by I Buske · 2016 · Cited by 1 — We inves...
Published: October 14, 2016
-
Source: qinetiq.com
Link: https://www.qinetiq.com/-/media/0b9c065bcb994265975c27b3b6356cbb.ashxSource snippet
The challenges of Directed Energy30 Mar 2021 — Directed Energy (DE) Effector technologies such as High. Energy Lasers (HEL) and High Powe...
-
Source: engrxiv.org
Link: https://engrxiv.org/preprint/download/6772/11079/9407Source snippet
in real time. 6.4 Safety, Compliance, and Scalability...
-
Source: arc.aiaa.org
Link: https://arc.aiaa.org/doi/10.2514/1.J061766Source snippet
AIAA JournalsAdaptive Optics for Directed Energy: Fundamentals and...by RB Holmes · 2022 · Cited by 28 — Adaptive optics are beneficial...
-
Source: publications.sto.nato.int
Link: https://publications.sto.nato.int/publications/STO%20Educational%20Notes/STO-EN-SCI-340/EN-SCI-340-06.pdfSource snippet
NATO Publications6.0 PROPAGATION AND ADAPTIVE OPTICSVirtually all the atmospheric effects on laser weapon systems can be traced to three...
-
Source: l3harris.com
Title: ® Fast
Link: https://www.l3harris.com/newsroom/editorial/2023/06/l3harris-directed-energy-beam-directors-key-component-critical-assetSource snippet
Forward.L3Harris Directed Energy Beam Directors – A Key...22 Jun 2023 — Directed energy and high-energy laser weapon systems have the po...
-
Source: inss.ndu.edu
Link: https://inss.ndu.edu/Research-and-Commentary/View-Publications/Article/4412653/laser-focusing-defense-capabilities/Source snippet
Laser-focusing Defense CapabilitiesSwarm-scale engagements exceeding dozens to hundreds of targets tax available laser dwell time and tra...
-
Source: dia.mil
Link: https://www.dia.mil/FOIA/FOIA-Electronic-Reading-Room/FileId/170045/Source snippet
Defense Intelligence AgencyState of the Art and Evolution of High-Energy Laser WeaponsMarch 4, 2022 — 31 Mar 2010 — However, they require...
Published: March 4, 2022
-
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.pdfSource snippet
Air and Space Power CentreDirected Energy Weapons - Air and Space Power CentreLaser energy can be used to attack targets susceptible to h...
-
Source: defencesciencereview.com.pl
Title: pdf 216776 135052
Link: https://www.defencesciencereview.com.pl/pdf-216776-135052?filename=Laser-Based-[Directed-EnerSource snippet
Defence Science ReviewDEFENCE SCIENCE REVIEWJanuary 17, 2026 — by A Karkadakattil · 2026 · Cited by 1 — The effectiveness of laser-based...
Published: January 17, 2026
-
Source: lockheedmartin.com
Link: https://www.lockheedmartin.com/en-us/news/features/2022/inside-the-lockheed-martin-laser-technology-that-defeated-a-surrogate-cruise-missile.htmlSource snippet
Inside the Lockheed Martin Laser Technology11 Aug 2022 — The LLD is a proven ground-based high-power laser weapon system capable of count...
Additional References
-
Source: drillanddefense.com
Link: https://drillanddefense.com/laser-weapons-the-new-layer-in-modern-air-defense/Source snippet
Laser Weapons: The New Layer in Modern Air DefenseLaser weapons are becoming part of modern air defense, especially against drones and lo...
-
Source: researchgate.net
Link: https://www.researchgate.net/publication/403676537Laser-Based_Directed_Energy_Weapons_Technological_Capabilities_Material_Interaction_and_Strategic[DeploymentSource snippet
(PDF) Laser-Based Directed Energy WeaponsThis review aims to evaluate the current capabilities of laser-based Directed Energy Weapons (DE...
-
Source: scienceandglobalsecurity.org
Link: https://scienceandglobalsecurity.org/archive/sgs18stupl.pdfSource snippet
This article presents a method developed to assess laser Directed Energy Weapon en- gagements. This method applies physics-based models...
-
Source: lupotoro.com
Link: https://www.lupotoro.com/insights/high-energy-laser-weapons-megawatt-class-mobile-systems-lupotoro-group-technical-analysisSource snippet
High-Energy Laser Weapons: Megawatt-Class Mobile...1 Oct 2025 — Modern ground lasers also use adaptive optics, though implementing AO on...
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Source: ciaotest.cc.columbia.edu
Link: https://ciaotest.cc.columbia.edu/olj/sa/sa_feb01ghc01.htmlSource snippet
In a thermal kill, the target is destroyed by a long dwell time of the laser and burning through...Read more...
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Source: facebook.com
Link: https://www.facebook.com/unboxfactory/posts/the-united-states-navy-has-successfully-tested-a-next-[generationSource snippet
ly and repeatedly without carrying large amounts of ammunition.Read more...
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Source: youtu.be
Title: 👉US Navy DEPLOYED Its Largest Warship to Venezuela
Link: https://youtu.be/V43Fj5n8gq4Source snippet
⚓ Disclaimer This channel is created for educational, informative, and entertainment purposes only...
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Source: youtube.com
Title: ATHENA Laser Weapon System Defeats Unmanned Aerial Systems
Link: https://www.youtube.com/watch?v=hNsUtZmWgdgSource snippet
LOCUST® X3 Modular Directed Energy Laser Weapon System demonstrates how advanced pinpoint tracking software maintains a stable energy foc...
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Source: sentrycs.com
Link: https://sentrycs.com/glossary/directed-energy-weapons-dew/Source snippet
ork in C-UAS operations and their limitations...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=icgoq2adGOESource snippet
ATHENA Laser Weapon System Defeats Unmanned Aerial Systems...
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