Within Defence Layer
The Beam Is Only Half the Weapon
The hardest part of a useful directed-energy layer may be finding, identifying, tracking and handing off small threats in time.
On this page
- Why small drones strain detection systems
- Tracking precision before a laser shot
- Command and control handoffs when time runs out
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Introduction
A laser defence system is often described as a weapon that destroys targets with a beam of light. In practice, the beam is only the final link in a much longer chain. The real challenge is detecting a small, fast or low-flying threat, determining that it is hostile, predicting where it will be seconds later, and keeping a precise track long enough for the laser to achieve its effect. If that sensor chain fails, even the most powerful laser becomes irrelevant.
This is why many directed-energy programmes increasingly emphasise sensor fusion, tracking accuracy and command-and-control integration as much as laser power. Modern counter-drone lasers rely on networks of radar, electro-optical and infrared sensors, tracking algorithms, beam directors and fire-control software that work together under severe time pressure. The effectiveness of the weapon depends as much on those systems as on the laser itself. [RTX+2AeroVironment, Inc.]rtx.comHigh-Energy Lasers | RaytheonThis directed energy technology enables detection of threats, tracking during maneuvers, and positive vis…
The Beam Is Only Half the Weapon
A high-energy laser cannot engage what it cannot see. Unlike a missile that can receive guidance updates after launch, a laser generally requires continuous line-of-sight tracking and a sustained dwell time on the target. The target must remain accurately located while the beam is held on a vulnerable point long enough to create damage. [Defence Finance Monitor+2AFRL]defencefinancemonitor.comdirected energy weapons in 20252035Defence Finance MonitorDirected Energy Weapons in 2025–2035: Development…23 May 2025 — lasers generally require a dwell time of a few…
This requirement creates a distinctive architecture:
- Wide-area detection identifies a possible threat.
- Classification sensors determine whether it is a bird, drone, aircraft or another object.
- Precision tracking systems establish a highly accurate track.
- Fire-control software predicts future target position.
- Beam directors and fine trackers keep the laser locked on target during engagement.
Each stage narrows uncertainty. The laser itself operates at the end of that process rather than replacing it. Advanced counter-UAS laser systems therefore combine radar, electro-optical and infrared cameras, laser rangefinders and specialised fine-tracking subsystems designed specifically to support the beam. [AeroVironment, Inc.]bluehalo.comAero Vironment, Inc.C-UAS Directed Energy | Aero Vironment, IncThis ISR unit features a fine tracking system (FTS), powerful telescope, laser rangefinder, acquisition tracking system (ATS), an…
Why Small Drones Strain Detection Systems
Small drones expose a fundamental weakness in many traditional air-defence sensor networks. Air-defence radars were historically optimised for aircraft, helicopters and missiles rather than lightweight quadcopters with small radar signatures flying close to terrain.
Several factors make detection difficult:
- Low radar cross-section: many small drones reflect little radar energy.
- Low altitude flight: terrain, buildings and vegetation create clutter.
- Slow speeds: drones can resemble birds or environmental noise.
- Large numbers: swarms can overwhelm tracking capacity.
- Short warning times: a drone may appear only minutes or seconds before reaching a defended site.
Because no single sensor is reliable in every condition, modern counter-drone architectures increasingly rely on sensor fusion. Radar may provide initial detection, while electro-optical and infrared systems confirm identity and generate a more precise track. Some systems also integrate radio-frequency sensing to identify drone control links when available. Multi-sensor fusion has become a central design principle because individual sensors have complementary weaknesses. [arXiv+2AeroVironment, Inc.]arxiv.orgIntelligent Multimodal Multi-Sensor Fusion-Based UAV Identification, Localization, and Countermeasures for Safeguarding Low-Altitude…
The result is a paradox: the cheapest threats often impose the greatest sensing burden. A laser may be inexpensive to fire, but finding a small drone in cluttered airspace remains technically demanding.
Tracking Precision Before a Laser Shot
Detection is not enough. A laser engagement requires much greater accuracy than simply knowing a target exists.
A missile interceptor can often tolerate some guidance error because it carries an explosive warhead. A laser must place energy on a specific part of the target and keep it there. Even minor tracking errors can spread energy across a larger area and reduce effectiveness. The challenge becomes even harder when either the target or the defending platform is moving. [AFRL]afrl.af.milDirected Energy Futures 2060 Final29June21 with clearance number2060 directed energy futures16 Jul 2021 — The challenge includes both tracking of moving targets at high levels of accuracy from movi…
From Detection Track to Fire-Control Track
Radar usually provides the first track. However, the angular precision of a search radar is often insufficient for a laser shot. The track must therefore be handed to higher-resolution sensors.
Electro-optical and infrared systems then zoom onto the target, allowing software to identify features and maintain a much more precise track. Systems such as BlueHalo’s LOCUST architecture incorporate telescopes, acquisition trackers, laser rangefinders and dedicated fine-tracking systems specifically for this purpose. [AeroVironment, Inc.]bluehalo.comAero Vironment, Inc.C-UAS Directed Energy | Aero Vironment, IncThis ISR unit features a fine tracking system (FTS), powerful telescope, laser rangefinder, acquisition tracking system (ATS), an…
This transition from broad detection to precision tracking is one of the most critical moments in the engagement chain. A target lost during handoff may disappear entirely from the engagement picture.
Fine Tracking and Beam Control
Once a target has been acquired, the system must compensate for vibration, atmospheric effects, target manoeuvres and platform motion.
This is why directed-energy developers devote major effort to beam directors, adaptive optics and stabilised tracking systems. Lockheed Martin identifies beam control and beam directors as core elements of operational laser systems, while long-term Air Force assessments highlight high-accuracy target tracking as one of the key challenges limiting future laser effectiveness. [Lockheed Martin]lockheedmartin.comLockheed MartinDirected Energy | Lockheed MartinExperience the potential of our laser weapons and directed energy weapon technologies, pr…
The popular image of a laser instantly destroying a target is therefore misleading. In reality, maintaining precise aim may be harder than generating the beam itself.
Command-and-Control Handoffs When Time Runs Out
The sensor problem is not purely technical. It is also organisational.
A modern defence network may involve multiple radars, separate optical systems, electronic warfare sensors, command centres and weapons. Information must move between them rapidly enough to create a usable engagement window.
Consider a drone approaching a naval vessel or military base:
- A surveillance radar detects an object.
- Command software correlates the contact with other sensor inputs.
- An electro-optical system confirms the target.
- The track is assigned to a laser weapon.
- The laser’s fine tracker acquires the target.
- Engagement authority is granted.
- The beam fires.
Every step consumes time.
Against small drones, that timeline may be measured in seconds. Delays that seem minor in a command centre can eliminate the laser’s opportunity to engage. This is one reason why directed-energy systems are increasingly designed as components within integrated air-defence architectures rather than as standalone weapons. [Leonardo DRS+2Leonardo USA]leonardodrs.comleonardo drs and bluehalo successfully demonstrate new counter uas directed energy stryker shooting down drones in live fire engagementLeonardo DRSSuccessful Demonstration of New C-UAS Directed Energy …14 Oct 2024 — Leonardo DRS and BlueHalo Successfully Demonstrate New…
The challenge becomes more severe during mass attacks. A defence network may successfully detect dozens of targets but still struggle to classify, prioritise and assign them quickly enough. Sensor saturation can become a limiting factor before laser power does.
The Hidden Risks in the Sensor Chain
Public discussions of laser weapons often focus on power levels measured in kilowatts. Operational experience suggests that several less visible vulnerabilities may be equally important.
Atmospheric Conditions
The same atmosphere that weakens laser beams can also degrade sensors. Haze, smoke, rain, sea spray and dust reduce detection ranges and tracking quality. A laser weapon that theoretically has a firing solution may still struggle if optical tracking quality collapses. [Laser Wars]laserwars.netnavy laser weapons challenges atmosphere fogLaser WarsFog of War: The Biggest Challenge for Naval Laser Weapons22 May 2025 — Laser weapons require line of sight and atmospheric stab…
Identification Errors
A defensive laser requires confidence that a detected object is actually hostile. Small drones, birds and civilian aircraft can create classification challenges, especially in congested airspace. The pressure to make rapid decisions increases the risk of mistakes.
Swarm Saturation
The most serious concern may not be individual drones but large numbers of them. Tracking resources, operator attention and fire-control capacity can all become overloaded. A sensor network that performs well against one target may struggle against dozens arriving simultaneously. Research into multi-sensor fusion and automated tracking increasingly focuses on this problem. [arXiv]arxiv.orgIntelligent Multimodal Multi-Sensor Fusion-Based UAV Identification, Localization, and Countermeasures for Safeguarding Low-Altitude…
What Recent Programmes Reveal
Recent counter-drone laser developments repeatedly highlight sensors rather than laser power alone.
BlueHalo’s LOCUST system emphasises its gimballed electro-optical tracking system, fine tracking system, telescope, acquisition tracking capability and laser rangefinder as key components supporting the laser engagement process. [AeroVironment, Inc.]bluehalo.comAero Vironment, Inc.C-UAS Directed Energy | Aero Vironment, IncThis ISR unit features a fine tracking system (FTS), powerful telescope, laser rangefinder, acquisition tracking system (ATS), an…
The UK’s DragonFire programme has attracted attention for its reported ability to hit extremely small aim points and engage high-speed drones. Such performance depends not only on laser output but also on precise tracking and beam-control functions capable of maintaining accuracy against moving targets. [Tom's Hardware+2Axios]tomshardware.comuk confirms dragonfire laser weapon for royal navy destroyers by 2027This follows a £316 million ($414 million) contract awarded to MBDA UK for the first two production units. DragonFire, a 50 kW-class lase…
Similarly, recent naval and ground-based demonstrations increasingly advertise AI-assisted detection, target tracking and sensor integration alongside the laser itself. Developers appear to recognise that future gains may come as much from improving the sensor chain as from adding more power to the beam. [TechRadar+2Leonardo DRS]techradar.comBush - it neutralized multiple UAVs for a fraction of the cost of a missile, protecting the fleet from cheap enemy drone swarmsApril 22…
The Real Bottleneck
The common image of directed-energy defence is a contest of power generation, cooling and laser physics. Those factors matter, but operationally the decisive bottleneck is often information rather than energy.
A defensive laser must know exactly where a target is, where it will be moments later and whether it should be engaged at all. Small drones compress that timeline to the point where sensor fusion, tracking precision and command-and-control speed become inseparable from weapon performance.
For that reason, the sensor chain is not merely a support system for a laser weapon. It is a substantial part of the weapon itself. The beam may travel at the speed of light, but only after the sensors, trackers and decision systems have already won the race against time.
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Endnotes
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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 vis...
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Title: Aero Vironment, Inc.C-UAS Directed Energy | Aero Vironment, Inc
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This ISR unit features a fine tracking system (FTS), powerful telescope, laser rangefinder, acquisition tracking system (ATS), an...
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Intelligent Multimodal Multi-Sensor Fusion-Based UAV Identification, Localization, and Countermeasures for Safeguarding Low-Altitude...
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Leonardo DRSSuccessful Demonstration of New C-UAS Directed Energy...14 Oct 2024 — Leonardo DRS and BlueHalo Successfully Demonstrate New...
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Title: c uas de stryker successfully demonstrated
Link: https://usa.leonardo.com/en/press-release-detail/-/detail/c-uas-de-stryker-successfully-demonstratedSource snippet
Leonardo USALeonardo DRS and BlueHalo successfully demonstrate...Oct 14, 2024 — Leonardo DRS and BlueHalo successfully demonstrate new C...
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Ministry of Defence has successfully tested a new high-powered military laser weapon known as DragonFire, designed to destroy drones with...
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Title: Tech Radar Game of drones
Link: https://www.techradar.com/tech/game-of-drones-dragonfire-laser-is-so-accurate-it-can-hit-a-coin-from-a-kilometer-away-and-even-400mph-drones-didnt-stand-a-chanceSource snippet
Capable of hitting a coin-sized target from a kilometer away, DragonFire offers a cost-effective alternative to traditional missile defen...
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Link: https://www.techradar.com/pro/the-usd5-drone-killer-the-navys-new-20kw-locust-laser-just-proved-its-unlimited-magazine-depth-on-the-uss-george-h-w-bush-it-neutralized-multiple-uavs-for-a-fraction-of-the-cost-of-a-missile-protecting-the-fleet-from-cheap-enemy-drone-swarmsSource snippet
Bush - it neutralized multiple UAVs for a fraction of the cost of a missile, protecting the fleet from cheap enemy drone swarmsApril 22...
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2060 directed energy futures16 Jul 2021 — The challenge includes both tracking of moving targets at high levels of accuracy from movi...
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Defence Finance MonitorDirected Energy Weapons in 2025–2035: Development...23 May 2025 — lasers generally require a dwell time of a few...
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Laser WarsFog of War: The Biggest Challenge for Naval Laser Weapons22 May 2025 — Laser weapons require line of sight and atmospheric stab...
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Source: tomshardware.com
Title: uk confirms dragonfire laser weapon for royal navy destroyers by 2027
Link: https://www.tomshardware.com/tech-industry/uk-confirms-dragonfire-laser-weapon-for-royal-navy-destroyers-by-2027Source snippet
This follows a £316 million ($414 million) contract awarded to MBDA UK for the first two production units. DragonFire, a 50 kW-class lase...
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What Does It Take To Out-Maneuver Enemy Drones?4 Oct 2021 — Semiconductor diode lasers spread out and diffuse over distances, which, on t...
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Additional References
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(PDF) Laser-Based Directed Energy WeaponsThis review aims to evaluate the current capabilities of laser-based Directed Energy Weapons (DE...
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High Energy Laser WeaponApollo is a high energy laser weapon system designed to defeat Group 1–3 UAS, with power levels up to 150kW and t...
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Technical Evolution and Operational Integration of Directed...The SpaceRay SA is an ultra-portable tracking and targeting device designe...
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U.S. Directed Energy Weapons SystemsThe Government Accountability Office explains what are Directed Energy Weapons and takes a look at ho...
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Published: May 2021
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