Within Heat Limits
Can Lasers Keep Up With Drone Swarms?
Drone raids turn short laser shots into a cumulative heat problem that can force pauses even when power is still available.
On this page
- Why many small targets create peak thermal load
- How repeated dwell times shrink firing margins
- What cooling limits mean for air defense planning
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Introduction
Counter-drone lasers are often advertised as having a “deep magazine” because they do not rely on a finite stock of missiles. However, drone swarms expose a different limit: heat. A laser that can destroy a single drone may still struggle when dozens of targets arrive within a few minutes. Each engagement deposits waste heat into the weapon system, and if that heat accumulates faster than cooling systems can remove it, firing rates must slow, power may be reduced, or the weapon may need to pause entirely. In this sense, drone swarms are not merely a targeting challenge; they are a thermal stress test that probes the practical endurance of directed-energy weapons under sustained operational demand. [GAO]gao.govScience & Tech Spotlight: Directed Energy Weapons25 May 2023 — Directed energy weapons (DEW) use concentrated electromagnetic energy t…
The issue is especially important because counter-drone defence is widely viewed as one of the most promising missions for high-energy lasers. Yet swarms compress many engagements into a short time window, turning what appears to be an ammunition advantage into a contest between target arrival rates and thermal recovery rates. [nationaldefensemagazine.org]nationaldefensemagazine.orgcounterdrone mission seen as killer app for directed energyCounter-UAS Mission Seen as Killer App for Directed EnergyJan 20, 2026 — High-powered microwaves can blast more energy at a drone or dron…
Can Lasers Keep Up With Drone Swarms?
The answer depends less on whether a laser can destroy a drone and more on how many drones it can defeat before thermal saturation occurs.
Unlike a missile battery that expends a physical interceptor, a laser expends time. The beam must remain on a target long enough to heat and damage critical components. This period, known as dwell time, can range from fractions of a second to several seconds depending on laser power, range, atmospheric conditions and target design. During a swarm attack, every additional second spent on one drone is a second unavailable for another. [electronicsforu.com+2defencefinancemonitor.com]electronicsforu.comdirected energy weapons laser weaponsDirected Energy Weapons: High-Energy Laser Weapons25 Jan 2017 — Unlike projectile weapons that instantly destroy the target upon impact…
As a result, swarm defence becomes a throughput problem. Even if a laser has electrical power available, it must maintain beam quality, tracking performance and acceptable component temperatures across a sequence of engagements. The more targets that appear in a compressed period, the greater the cumulative thermal burden. [GAO]gao.govScience & Tech Spotlight: Directed Energy Weapons25 May 2023 — Directed energy weapons (DEW) use concentrated electromagnetic energy t…
Why Many Small Targets Create Peak Thermal Load
A common misconception is that large aircraft or missiles are the hardest thermal challenge for laser weapons. In practice, a dense swarm of small drones can be more demanding because it forces continuous operation.
A single engagement may not significantly stress a cooling system. A swarm, however, can require dozens of consecutive shots with little opportunity for recovery. Every engagement adds waste heat from laser generation, beam control systems, power electronics and cooling equipment. The thermal load therefore accumulates across the engagement sequence rather than being determined by a single shot. [GAO]gao.govScience & Tech Spotlight: Directed Energy Weapons25 May 2023 — Directed energy weapons (DEW) use concentrated electromagnetic energy t…
The mathematics can become unforgiving. If a laser requires even one or two seconds of effective dwell time per target, a swarm of dozens of drones can rapidly consume available engagement time. Studies examining directed-energy defence against UAV swarms emphasise that swarm defeat probability depends heavily on target arrival rates and the time required to service each target. [Sage Journals]journals.sagepub.comSage JournalsEffect of dwell time, distance, and reflecting area on UAV…9 Jul 2025 — This paper is concerned with the operational effe…
This is one reason military organisations increasingly evaluate layered counter-drone architectures rather than assuming a laser can handle all incoming threats. Swarms test not only weapon lethality but also the sustainability of repeated engagements under operational conditions. [Lockheed Martin]lockheedmartin.comLockheed MartinC-UAS Challenge: Closing the Gap in Drone Swarm Defense5 Aug 2025 — The system is designed to quickly detect, track, ID an…
How Repeated Dwell Times Shrink Firing Margins
The thermal challenge is magnified because dwell time and heat generation are linked.
Longer dwell times mean the laser remains at high output for longer periods, generating more cumulative waste heat. If atmospheric conditions reduce beam effectiveness, if targets manoeuvre, or if drones incorporate protective measures that delay damage, required dwell times increase further. That directly raises the thermal burden imposed on the system. [Naval Postgraduate School]nps.eduHEL laser beam, which will thus increase the dwell timeNaval Postgraduate SchoolCounter Directed Energy Weapons and the Defense of…January 10, 2023 — by B Johnson · 2023 · Cited by 2 — Usin…
Swarm tactics can exploit this relationship. Defence analyses have noted that manoeuvres, decoys and other tactics can increase the time required for a successful engagement. Even modest increases in dwell time can significantly reduce the number of drones defeated within a given interval. [Naval Postgraduate School]nps.eduHEL laser beam, which will thus increase the dwell timeNaval Postgraduate SchoolCounter Directed Energy Weapons and the Defense of…January 10, 2023 — by B Johnson · 2023 · Cited by 2 — Usin…
This creates a cascading effect:
- More targets require more engagements. [eos-aus.com]eos-aus.comEOS AUSApollo High Energy Laser WeaponIts increased laser power and reduced dwell time between engagements enable it to disable more than… * More engagements require more cumulative dwell time. [electronicsforu.com]electronicsforu.comdirected energy weapons laser weaponsDirected Energy Weapons: High-Energy Laser Weapons25 Jan 2017 — Unlike projectile weapons that instantly destroy the target upon impact… * More dwell time generates more waste heat. [eos-aus.com]eos-aus.comEOS AUSApollo High Energy Laser WeaponIts increased laser power and reduced dwell time between engagements enable it to disable more than…
- More heat reduces available firing margin before cooling limits are reached.
The result is that a laser may theoretically possess sufficient power to continue firing but may be constrained by thermal management requirements long before electrical energy is exhausted. [GAO]gao.govScience & Tech Spotlight: Directed Energy Weapons25 May 2023 — Directed energy weapons (DEW) use concentrated electromagnetic energy t…
Real-World Indicators of the Throughput Problem
Public demonstrations often highlight the number of drones a system can defeat per minute rather than simply whether it can destroy a drone at all. That emphasis reflects the operational importance of sustained engagement rates.
Manufacturers of counter-UAS laser systems increasingly advertise metrics such as defeating more than 20 drones per minute or maintaining high engagement rates against swarm attacks. Such claims implicitly recognise that the key challenge is repeated engagement throughput rather than individual-shot lethality. [EOS AUS]eos-aus.comEOS AUSApollo High Energy Laser WeaponIts increased laser power and reduced dwell time between engagements enable it to disable more than…
At the same time, recent military interest in radio-frequency and high-power microwave systems reflects an important contrast. Unlike lasers, which generally engage targets sequentially and require dwell time on each threat, some radio-frequency directed-energy systems can affect multiple drones simultaneously. British Army trials in 2025 demonstrated the defeat of drone swarms using a radio-frequency directed-energy weapon, with officials specifically emphasising its ability to engage multiple targets at once. [des.mod.uk+2Business Insider]des.mod.ukbritish army uses radio waves to down drone swarms17 Apr 2025 — The British Army has tracked, targeted and defeated swarms of drones for the first time in the latest trial of a radiofrequ…
The comparison does not mean lasers are ineffective. Rather, it highlights why swarm defence is often discussed as a system-level problem. Different directed-energy technologies experience different thermal and engagement-rate constraints under massed attacks. [nationaldefensemagazine.org]nationaldefensemagazine.orgcounterdrone mission seen as killer app for directed energyCounter-UAS Mission Seen as Killer App for Directed EnergyJan 20, 2026 — High-powered microwaves can blast more energy at a drone or dron…
What Cooling Limits Mean for Air-Defence Planning
For air-defence planners, the critical question is not whether a laser can destroy a drone but whether it can sustain enough engagements during the peak period of an attack.
A laser that performs well against sporadic threats may encounter difficulties when confronted with dozens of drones arriving nearly simultaneously. In such scenarios, cooling capacity effectively becomes part of the weapon’s magazine depth. The system’s endurance depends on how rapidly it can reject heat and restore thermal margins between shots. [GAO]gao.govScience & Tech Spotlight: Directed Energy Weapons25 May 2023 — Directed energy weapons (DEW) use concentrated electromagnetic energy t…
This reality explains several emerging trends in counter-drone doctrine:
- Layered defences: Lasers are increasingly viewed as one component within broader air-defence networks rather than a standalone solution. [Lockheed Martin]lockheedmartin.comLockheed MartinC-UAS Challenge: Closing the Gap in Drone Swarm Defense5 Aug 2025 — The system is designed to quickly detect, track, ID an…
- Higher-efficiency laser designs: Developers continue to pursue architectures that generate less waste heat per unit of output power. [Lockheed Martin]lockheedmartin.comwebt laser swarms dronesLockheed MartinTechnology that Counters Drone Swarms14 Jun 2016 — Our high power laser approach operates with an efficiency that generate…
- Interest in complementary directed-energy systems: High-power microwave and radio-frequency weapons are attractive because they may engage multiple drones simultaneously, reducing the sequential engagement burden. [nationaldefensemagazine.org]nationaldefensemagazine.orgcounterdrone mission seen as killer app for directed energyCounter-UAS Mission Seen as Killer App for Directed EnergyJan 20, 2026 — High-powered microwaves can blast more energy at a drone or dron…
- Focus on engagement-rate metrics: Operational value is increasingly measured by sustained swarm-defeat capacity rather than isolated demonstration shots. [EOS AUS]eos-aus.comEOS AUSApollo High Energy Laser WeaponIts increased laser power and reduced dwell time between engagements enable it to disable more than…
In effect, drone swarms reveal a hidden dimension of laser performance. The challenge is not merely producing a powerful beam but maintaining that capability through dozens of consecutive engagements without exceeding thermal limits. A laser may have a deep magazine on paper, yet a sufficiently dense swarm can transform the fight into a race between incoming targets and the weapon’s ability to shed heat. [Fast Company+2Sage Journals]fastcompany.comwhy the military is obsessed with the myth of the infinite magazineIn practice, dwell time, heat, and the chaos of the battlefield…
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Further Reading
Books and field guides related to Can Lasers Keep Up With Drone Swarms?. Use these as the next step if you want deeper reading beyond the article.
Army of None
Provides strong context on autonomous systems, drone swarms, and the operational challenges modern defenses must overcome.
The Kill Chain
Examines emerging threats, precision warfare, and the challenge of defending against large numbers of networked systems.
Laser Fundamentals
First published 2004. Subjects: Lasers, Ta1675 .s52 2004, 621.36/6.
Introduction to Lasers and Masers
First published 1971. Subjects: Lasers, Masers, Laser, Maser, 33.38 modern optics.
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Endnotes
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Source: gao.gov
Link: https://www.gao.gov/products/gao-23-106717Source snippet
Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — Directed energy weapons (DEW) use concentrated electromagnetic energy t...
Published: May 2023
-
Source: nationaldefensemagazine.org
Title: counterdrone mission seen as killer app for directed energy
Link: https://www.nationaldefensemagazine.org/articles/2026/1/20/counterdrone-mission-seen-as-killer-app-for-directed-energySource snippet
Counter-UAS Mission Seen as Killer App for Directed EnergyJan 20, 2026 — High-powered [microwaves]({{ 'microwaves/' | relative_url }}) can blast more energy at a drone or dron...
-
Source: electronicsforu.com
Title: directed energy weapons laser weapons
Link: https://www.electronicsforu.com/technology-trends/directed-energy-weapons-laser-weaponsSource snippet
Directed Energy Weapons: High-Energy Laser Weapons25 Jan 2017 — Unlike projectile weapons that instantly destroy the target upon impact...
-
Source: defencefinancemonitor.com
Title: directed energy weapons in 20252035
Link: https://www.defencefinancemonitor.com/p/directed-energy-weapons-in-20252035Source snippet
Directed Energy Weapons in 2025–2035: Development...23 May 2025 — This HPM system, mounted on a MAN HX60 4×4 truck, neutralized over 100...
Published: May 2025
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Source: eos-aus.com
Link: https://eos-aus.com/defence/high-energy-laser-weapon/apollo/Source snippet
EOS AUSApollo High Energy Laser WeaponIts increased laser power and reduced dwell time between engagements enable it to disable more than...
-
Source: des.mod.uk
Title: british army uses radio waves to down drone swarms
Link: https://des.mod.uk/british-army-uses-radio-waves-to-down-drone-swarms/Source snippet
17 Apr 2025 — The British Army has tracked, targeted and defeated swarms of drones for the first time in the latest trial of a radiofrequ...
-
Source: fastcompany.com
Title: why the military is obsessed with the myth of the infinite magazine
Link: https://www.fastcompany.com/91505526/why-the-military-is-obsessed-with-the-myth-of-the-infinite-magazineSource snippet
In practice, dwell time, heat, and the chaos of the [battlefield]({{ 'battle-limits/' | relative_url }})...
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Source: lockheedmartin.com
Link: https://www.lockheedmartin.com/en-us/news/features/2025/the-counter-uas-challenge-closing-the-gap-in-drone-swarm-defense.htmlSource snippet
Lockheed MartinC-UAS Challenge: Closing the Gap in Drone Swarm Defense5 Aug 2025 — The system is designed to quickly detect, track, ID an...
-
Source: journals.sagepub.com
Link: https://journals.sagepub.com/doi/10.1177/15485129251340992Source snippet
Sage JournalsEffect of dwell time, distance, and reflecting area on UAV...9 Jul 2025 — This paper is concerned with the operational effe...
-
Source: lockheedmartin.com
Link: https://www.lockheedmartin.com/en-us/capabilities/directed-energy.htmlSource snippet
Directed Energy | Lockheed MartinExperience the potential of our laser weapons and directed energy weapon technologies, providing afforda...
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Source: nps.edu
Title: HEL laser beam, which will thus increase the dwell time
Link: https://nps.edu/documents/10180/142489929/JDE_7-2_Johnson.pdfSource snippet
Naval Postgraduate SchoolCounter Directed Energy Weapons and the Defense of...January 10, 2023 — by B Johnson · 2023 · Cited by 2 — Usin...
Published: January 10, 2023
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Source: businessinsider.com
Link: https://www.businessinsider.com/uk-took-down-swarm-drones-new-radio-weapon-rfdew-thales-2025-4Source snippet
This marks the first time in the UK that such a directed energy weapon, developed by a consortium led by French firm Thales, has eliminat...
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Source: lockheedmartin.com
Title: webt laser swarms drones
Link: https://www.lockheedmartin.com/en-us/news/features/2016/webt-laser-swarms-drones.htmlSource snippet
Lockheed MartinTechnology that Counters Drone Swarms14 Jun 2016 — Our high power laser approach operates with an efficiency that generate...
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Source: GOV.UK
Link: https://www.gov.uk/government/news/british-soldiers-take-down-drone-swarm-in-groundbreaking-use-of-radio-wave-weaponSource snippet
soldiers take down drone swarm in groundbreaking...17 Apr 2025 — British soldiers have successfully tracked, targeted and defeated swarm...
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Source: rtx.com
Link: https://www.rtx.com/raytheon/what-we-do/integrated-air-and-missile-defense/lasersSource snippet
High-Energy Lasers | RaytheonThis directed energy technology enables detection of threats, tracking during maneuvers, and positive visual...
Additional References
-
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 Weapons12 Apr 2026 — This review aims to evaluate the current capabilities of laser-based Directed Ener...
-
Source: linkedin.com
Link: https://www.linkedin.com/pulse/technical-evolution-operational-integration-light-based-robi-sen-hhdocSource snippet
Technical Evolution and Operational Integration of Directed...Directed-energy performance claims are especially sensitive to range, weat...
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Source: thetimes.co.uk
Link: https://www.thetimes.co.uk/article/mod-energy-weapon-shoots-down-swarms-of-drones-xzhrjzq3dSource snippet
The device damages internal electronics of drones, making them explode or malfunction, and has shown remarkable success during testing by...
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Source: onr.navy.mil
Link: https://www.onr.navy.mil/organization/departments/code-35/division-353/directed-energy-weapons-cdew-and-high-energy-lasersSource snippet
Directed Energy Weapons and High Energy LasersThe intent is to increase accuracy in all weather conditions against high speed, maneuverin...
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Source: uasweekly.com
Link: https://uasweekly.com/2026/06/03/esh-tech-unveils-dronelight-laser-weapon-system-that-destroys-hostile-drones-in-seconds/Source snippet
Esh-Tech Unveils DroneLight Laser Weapon System That...3 Jun 2026 — The system supports engagement rates of up to 5Hz, translating into...
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Source: leonardodrs.com
Title: counter drone [stryker]({{ ‘stryker/’ | relative_url }}) armored vehicle armed with lasers rockets guns unveiled
Link: https://www.leonardodrs.com/news/in-the-news/counter-drone-stryker-armored-vehicle-armed-with-lasers-rockets-guns-unveiled/Source snippet
C-UAS Drone Stryker Vehicle Armed With Lasers Unveiled14 Oct 2024 — A new counter-drone focused variant of the Stryker armed with a laser...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=cEdgipGA6L0Source snippet
America Has Unveiled a New UAV-Catching Energy CannonUncover the terrifying story of The Locust X3 — a bizarre machine shrouded in myster...
-
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 — Certainly, directed-energy weapons may be key to inexpensively countering missi...
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Source: laserwars.net
Title: army enduring high energy laser weapon draft request for proposal
Link: https://www.laserwars.net/p/army-enduring-high-energy-laser-weapon-draft-request-for-proposalSource snippet
The Army Finally Has a Real Path to Fielding Laser Weapons26 Jan 2026 — But it's also a reminder that sustained laser weapon performance...
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Source: bisi.org.uk
Title: from lasers to mini missiles emerging counter drone technology
Link: https://bisi.org.uk/reports/from-lasers-to-mini-missiles-emerging-counter-drone-technologySource snippet
From Lasers to Mini-Missiles: Emerging Counter-Drone...5 Feb 2025 — Although rising military assets now mount anti-drone lasers to bolst...
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