Within Laser Tradeoff
Why Laser Defenses Can Fall Behind Swarms
Laser defenses can be highly precise, but every added drone can stretch the engagement queue when targets must be tracked and held in the beam.
On this page
- Detect track dwell cycle
- What target count does to engagement tempo
- Where precision still earns its place
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Introduction
Laser-based defences are often described as having a “deep magazine” because they do not run out of missiles. Against drone swarms, however, the limiting factor is frequently not ammunition but time. A high-energy laser must normally detect a target, track it accurately, hold the beam on a vulnerable point long enough to cause damage, assess the effect, and then move on to the next target. This requirement for beam dwell time creates a queue. As the number of incoming drones rises, the queue can grow faster than targets can be processed, turning swarm defence into a race between engagement tempo and swarm arrival rate. Research on counter-uncrewed aerial systems increasingly treats this as a queuing and timing problem rather than simply a question of laser power. [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…
Detect–Track–Dwell Cycle
A laser engagement is not instantaneous even though the beam itself travels at the speed of light. The weapon must first identify and track the target, stabilise the beam on a specific point, and then maintain energy delivery long enough to achieve the desired effect. Counter-drone studies consistently identify dwell time as a critical variable because damage depends on cumulative heating rather than a single pulse. [Sage Journals+2securityanddefence.pl]journals.sagepub.comSage JournalsEffect of dwell time, distance, and reflecting area on UAV…9 Jul 2025 — This paper is concerned with the operational effe…
In practical terms, the engagement sequence consists of:
- Detection and classification of the drone.
- Precision tracking to keep the beam on a vulnerable location.
- Dwell, during which thermal energy accumulates.
- Battle-damage assessment to determine whether the target has been neutralised.
- Retargeting to the next drone. Sentrycs
Each step consumes time. Even when modern beam directors and tracking systems reduce transition delays, the laser is generally committed to one target at a time. Analysts of directed-energy systems therefore model laser defence as a sequential process in which engagement capacity depends heavily on average dwell time and retargeting speed. Sage Journals+2LinkedIn
The dwell requirement can also vary significantly. Factors such as range, target size, atmospheric conditions, target materials, and beam stability affect how long the laser must remain on target before damage occurs. Research examining swarm defeat probabilities specifically highlights dwell time as one of the dominant variables governing how many drones can be eliminated before surviving attackers reach their objective. Sage Journals
What Target Count Does to Engagement Tempo
The key challenge of a swarm is that every additional drone adds another item to the queue.
If a laser system can defeat one drone every few seconds, a handful of targets may be manageable. A swarm containing dozens of drones changes the arithmetic. The defender must repeatedly complete the detect-track-dwell cycle while the remaining drones continue moving toward the defended asset. The engagement problem therefore scales roughly with target count. Sentrycs
This creates a saturation effect:
- Ten drones require roughly ten engagement windows.
- Fifty drones require roughly fifty engagement windows.
- Lost track, evasive movement, or uncertain kill assessment can force re-engagement and further increase queue length. laserwars.net
Academic modelling of high-energy laser defence has explicitly examined swarm defeat as a queue-based problem. The probability of stopping a swarm depends not only on weapon effectiveness but also on whether the system can process targets quickly enough before the available engagement time expires. As arrival rates increase, the risk rises that one or more drones will survive simply because they reach the defended area before their turn in the queue arrives. Sage Journals
This explains why swarm designers often emphasise numbers over sophistication. A large group of inexpensive drones can stress engagement capacity even if individual drones are relatively vulnerable. Some counter-directed-energy analyses identify swarm tactics and erratic manoeuvring as methods for extending required dwell time or breaking beam contact, thereby reducing the number of targets a laser can service per minute. Naval Postgraduate School
Why Retargeting Matters Almost as Much as Dwell
Discussions of laser performance often focus on beam power, but retargeting speed can be equally important in swarm scenarios.
A laser that destroys a drone rapidly but spends significant time slewing to the next target may still develop a backlog. Conversely, a system with fast tracking and rapid beam steering can improve overall throughput even if individual engagements remain relatively short. This is why manufacturers frequently advertise drones defeated per minute rather than only laser power. Recent systems have highlighted high engagement rates and reduced dwell intervals as major improvements for swarm defence. Eos Aus+2Facebook
The operational metric becomes engagement tempo: how many complete kill cycles can be executed before the swarm closes distance or reaches weapon release range.
Where Precision Still Earns Its Place
The queue problem does not make lasers ineffective. It defines the situations in which they provide the greatest value.
Laser weapons offer exceptional precision. Rather than affecting everything in a broad area, they can target a specific drone, sensor, communications node, or payload with minimal collateral effects. This selectivity is especially valuable around friendly forces, civilian infrastructure, airports, ships, or other environments where indiscriminate effects are unacceptable. Sentrycs
Precision also allows defenders to prioritise targets rather than simply processing them in arrival order. A command-and-control drone coordinating a swarm may be more valuable to destroy than several ordinary members. Likewise, drones carrying larger payloads or acting as reconnaissance platforms can be engaged first if the fire-control system recognises them. Advanced counter-UAS architectures increasingly focus on software-driven target prioritisation to ensure limited engagement capacity is spent on the most dangerous threats. Lockheed Martin
Another advantage is predictability. Once sufficient energy is delivered to the target, the physical damage mechanism is generally well understood. Unlike area-effect systems that depend on electronic susceptibility, a laser can often produce a visible and verifiable defeat mechanism. Sentrycs
The Central Trade-Off in Swarm Defence
For laser weapons, swarm defence is fundamentally a throughput problem. Every target requires attention, tracking accuracy, and dwell time. Improvements in beam power, tracking algorithms, predictive aiming, and retargeting speed all aim at the same goal: shortening the queue and increasing the number of engagements that can be completed before the swarm arrives. ResearchGate+2Sage Journals
This is the core reason laser systems occupy a different position from high-power microwave systems in counter-swarm discussions. Lasers deliver highly controlled, single-target effects, but their effectiveness against large swarms is tied to how quickly they can move through a growing queue of targets. When target numbers rise faster than engagement tempo, even a powerful laser can begin to fall behind. Sentrycs+2Sage Journals
Amazon book picks
Further Reading
Books and field guides related to Why Laser Defenses Can Fall Behind Swarms. Use these as the next step if you want deeper reading beyond the article.
Army of None
Covers autonomy, engagement tempo, and the operational problems created by large numbers of unmanned systems.
Wired for War
Covers the rise of robotic warfare and helps readers understand the operational environment in which drone swarms emerge.
The Kill Chain
Discusses sensor-to-shooter timelines, targeting cycles, and the challenge of keeping pace with massed threats.
Army of None: Autonomous Weapons and the Future of War
Covers autonomy, engagement tempo, and the operational problems created by large numbers of unmanned systems.
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Endnotes
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Source: securityanddefence.pl
Link: https://securityanddefence.pl/Testing-the-[efficiencySource snippet
High energy and high accuracy tracking mechanism are needed.Read more...
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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: 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...Developed by AeroVironment, the LOCUST Laser Weapon System is a modular, p...
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Source: researchgate.net
Link: https://www.researchgate.net/publication/393531898_Effect_of_dwell_time_distance_and_reflecting_area_on_UAV_swarm_elimination_in_the_presence_of_directed_energy_weaponsSource snippet
Effect of dwell time, distance, and reflecting area on UAV...The purpose of this paper is to develop a simplified framework...
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Source: laserwars.net
Title: How to Counter a Laser Weapon
Link: https://www.laserwars.net/p/counter-directed-energy-weapon-solutionsSource snippet
by Jared Keller3 days ago — Swarm tactics extend this principle by flooding the adversary's engagement capacity: a single laser system ca...
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Source: researchgate.net
Link: https://www.researchgate.net/publication/395192454_AI-Based_Predictive_Laser_Beam_Control_for_UAV_Interception_in_Directed_Energy_Weapon_Systems_Using_Velocity-Based_Trajectory_PredictionSource snippet
The predictive model...Read more...
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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...
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Source: facebook.com
Link: https://www.facebook.com/DefenseNews/posts/the-future-fight-is-autonomous-eos-is-tackling-drone-swarms-with-ai-scalable-las/1228803569281700/Source snippet
The future fight is autonomous. EOS is tackling drone...Capable of taking down up to 50 drones per minute with its 150kW-class laser bea...
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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...
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Link: https://www.lockheedmartin.com/en-us/news/features/2025/the-counter-uas-challenge-closing-the-gap-in-[drone-swarmSource snippet
Lockheed MartinC-UAS Challenge: Closing the Gap in Drone Swarm Defense5 Aug 2025 — The system is designed to quickly detect, track, ID an...
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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: lockheedmartin.com
Title: webt laser swarms drones
Link: https://www.lockheedmartin.com/en-us/news/features/2016/webt-laser-swarms-drones.htmlSource snippet
Technology that Counters Drone Swarms14 Jun 2016 — Our high power laser approach operates with an efficiency that generates less heat and...
Additional References
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Link: https://www.rtx.com/raytheon/what-we-do/integrated-air-and-missile-defense/lasers -
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: 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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Link: https://www.youtube.com/watch?v=3FIdiGV8tS4Source snippet
Legacy: Countering Drone SwarmsDrone swarms are changing the [battlefield]({{ 'battle-limits/' | relative_url }}) by making mass cheap and scalable. Hundreds of low-cost drones c...
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Title: Aero Vironment, Inc.C-UAS Directed Energy | Aero Vironment, Inc
Link: https://bluehalo.com/c-uas-autonomous-systems/c-uas-directed-energy/Source snippet
Blue HaloLOCUST® X3 is a third-generation 20–35+ kW Directed Energy Laser Weapon System designed to defeat current and emerging aerial th...
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Source: youtube.com
Title: Futuristic Weapon Just Turned U.S. Aircraft Carriers Into Unsinkable Fortresses
Link: https://www.youtube.com/watch?v=mKq60ECLhLASource snippet
On the ground with a £300M laser weapon: DRAGONFIRE...
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Source: youtube.com
Title: America Has Unveiled a New UAV-Catching Energy Cannon
Link: https://www.youtube.com/watch?v=cEdgipGA6L0Source snippet
Futuristic Weapon Just Turned U.S. Aircraft Carriers Into Unsinkable Fortresses...
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Source: defencesciencereview.com.pl
Title: pdf 216776 135052
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DEFENCE SCIENCE REVIEWby A Karkadakattil · 2026 · Cited by 1 — Laser Directed Energy Weapons (DEWs) significantly reduce engagement timel...
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Source: youtube.com
Title: UK’s Dragon Fire Weapon Just Made Drones Completely USELESS
Link: https://www.youtube.com/watch?v=r1ajx66gVisSource snippet
Drone Swarms Are Here. This Technology Could Stop Them...
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Source: files01.core.ac.uk
Link: https://files01.core.ac.uk/download/pdf/578755277.pdfSource snippet
Perspectives of Countering UAV Swarmsby R Nallamalli · 2023 · Cited by 11 — An engagement rate of 1.3 sec can be achieved by using target...
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