Within Layered Defence
Why Lasers Still Need Backup Weapons
Lasers can save missiles against some drones, but weather, line of sight, tracking and power limits keep guns and jammers in the stack.
On this page
- What lasers cannot reliably handle
- Where jamming and guns still matter
- How accepting closer engagements changes risk
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Introduction
Lasers are often presented as the future of air defence because they can engage some drones at extremely low cost per shot and without consuming scarce interceptor missiles. Yet the most important operational lesson from current directed-energy programmes is that lasers work best as one layer in a wider defensive stack. Weather, line-of-sight constraints, target behaviour, power requirements and engagement geometry all create situations where a laser may be unavailable, ineffective or simply not the most efficient option. That is why modern air-defence concepts continue to pair lasers with electronic warfare systems, radio-frequency jammers and conventional guns rather than treating them as replacements. [GAO+2RAND Corporation]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — DEWs are generally less effective the farther they are from the target…
The practical question is not whether lasers work. Recent systems such as DragonFire have demonstrated successful drone interceptions. The question is what happens when conditions are less than ideal. In those moments, backup layers become essential. [GOV.UK]gov.uk£316 million contract awarded to MBDA …Read moreBoost for Armed Forces as new laser weapon takes down …20 Nov 2025 — DragonFire achieves UK first in latest testing, taking down high-s…
What Lasers Cannot Reliably Handle
A laser must keep energy concentrated on a target for long enough to damage critical components. That requirement creates vulnerabilities that missiles, guns and jammers do not always share.
Weather and atmospheric interference
High-energy lasers depend on relatively clear atmospheric conditions. Rain, fog, smoke, dust, haze and other airborne particles can scatter or absorb energy before it reaches the target. Even when a laser remains usable, these conditions can reduce range, increase engagement time or lower kill probability. Government and defence assessments consistently identify atmospheric effects as one of the main operational constraints on laser weapons. [GAO+2National Defense Magazine]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — DEWs are generally less effective the farther they are from the target…
This matters because air-defence systems cannot choose the weather. A defensive network protecting a port, airbase or deployed force must function during storms, smoke-producing attacks or poor visibility. Guns and electronic warfare systems provide options when laser performance degrades.
Line of sight remains a hard limit
Unlike long-range missiles that can receive guidance updates and engage beyond the horizon, lasers require a direct path to the target. Terrain, buildings, vegetation, curvature of the Earth and battlefield obscurants can block or restrict engagements. [RAND Corporation+2Drill & Defense]rand.orgRAND CorporationDirected Energy: The Focus on Laser Weapons IntensifiesJan 25, 2024 — Physical limitations include the need for HELs to h…
This limitation is particularly important against low-flying threats. A drone or cruise missile using terrain for concealment may only become visible at relatively short range. In such cases, defenders may have very little time to establish a stable laser track and generate sufficient effects before the target reaches a protected area.
Tracking and dwell-time challenges
A laser does not create an instant effect on every target. Many engagements require the beam to remain accurately focused on a vulnerable point for a period of time. Fast manoeuvres, target rotation, erratic flight paths or partial shielding can complicate this process. [RTX]rtx.comHigh-Energy Lasers | RaytheonThis directed energy technology enables detection of threats, tracking during maneuvers, and positive vis…
A gun firing programmable ammunition or a jammer disrupting a control link may sometimes achieve the desired effect more quickly against a difficult target geometry. The challenge becomes greater when multiple threats arrive simultaneously from different directions.
Power and thermal constraints
Although the cost per shot is low, laser systems require substantial electrical power, cooling and beam-control infrastructure. Mobile platforms face limits on how much power they can generate and how much heat they can dissipate. [National Defense Magazine+2GAO]nationaldefensemagazine.orggovernment perspective directed energy in air base defense can save the arsenalHigh-power electromagnetic weapons require line-of-sight and are sensitive…Read more…
This does not make lasers impractical, but it means they are not an unlimited resource. Sustained operations, repeated engagements and high-demand scenarios can place stress on supporting systems in ways that conventional guns do not.
Where Jamming and Guns Still Matter
Layered defence works because different weapons exploit different failure modes. If a laser attacks the physical structure of a drone, a jammer attacks its ability to communicate, navigate or coordinate, while a gun attacks the target through kinetic impact.
Jamming can defeat threats without destruction
Many drones depend on radio-frequency links, satellite navigation or other electronic systems. Jammers and electronic warfare tools can disrupt those dependencies without requiring the precise tracking needed for a laser kill. Counter-UAS studies consistently identify electronic attack as a major mitigation method because it can affect entire categories of drone threats. [arXiv]arxiv.orgCounter-Unmanned Aircraft System(s) (C-UAS): State of the Art, Challenges and Future TrendsAugust 28, 2020…
A jammer may therefore be the preferred first response against commercially derived drones or reconnaissance platforms, especially when operators want to preserve secrecy, minimise collateral effects from falling debris or conserve other defensive assets.
Guns remain valuable at very short range
Modern air-defence guns are not simply legacy systems waiting to be replaced. They offer rapid engagement against close targets, can function in conditions that challenge lasers and provide a final protective layer when other systems fail. [AeroVironment]avinc.comAeroVironmentThe Math Problem Breaking Air Defense, And Why Lasers…4 Mar 2026 — RF-based systems will continue to play an important ro…
For defenders, the key advantage is immediacy. If a threat appears unexpectedly at close range or emerges from behind terrain, a gun may have a better opportunity to engage before impact. Guns also remain useful against targets that are difficult to jam or that present poor laser engagement opportunities.
Different threats require different tools
Not every aerial threat is equally vulnerable to every defensive method.
- A commercially controlled drone may be highly susceptible to jamming.
- A small drone visible in clear weather may be an ideal laser target.
- A fast-approaching target at close range may favour gun engagement.
- More demanding threats may still require missile interceptors.
The purpose of layering is not redundancy for its own sake. It is to ensure that the weakness of one system is covered by the strengths of another. [RAND Corporation+2The Strategist]rand.orgRAND CorporationDirected Energy: The Focus on Laser Weapons IntensifiesJan 25, 2024 — Physical limitations include the need for HELs to h…
How Accepting Closer Engagements Changes Risk
One consequence of relying on lasers is that many engagements occur at shorter ranges than those associated with long-range missile defence. This creates operational trade-offs.
When a laser becomes the preferred response to low-cost drones, commanders may deliberately allow certain threats to approach closer before engagement. The economic logic is attractive because it preserves expensive interceptors. However, shorter engagement ranges leave less margin for error if tracking is lost, weather deteriorates or the target behaves unexpectedly. [RAND Corporation]rand.orgRAND CorporationDirected Energy: The Focus on Laser Weapons IntensifiesJan 25, 2024 — Physical limitations include the need for HELs to h…
Backup layers therefore become more important, not less. A drone that survives an attempted laser engagement may immediately enter the envelope of a gun system. A target that cannot be reliably tracked by the laser may be handed to electronic warfare assets. The closer the engagement occurs to the defended asset, the more critical these fallback options become.
This is one reason recent laser programmes are being integrated into broader air-defence architectures rather than deployed as standalone solutions. Even advocates of directed-energy weapons describe them as complementary capabilities that free missiles for harder targets while relying on other defensive layers to cover conditions where lasers are less effective. [Financial Times+2Think Defence]ft.comContratistas reconocidos como RTX, MBDA, y QinetiQ están invirtiendo significativamente en esta tecnología, que ha sido previamente consi…
The Real Role of the Laser Layer
The strongest implementation case for lasers is not that they eliminate the need for guns and jammers. It is that they reduce the burden on those systems by handling a subset of threats economically and repeatedly. Modern programmes such as DragonFire, Iron Beam and other high-energy laser efforts are being incorporated into layered air-defence networks rather than replacing existing weapons. [GOV.UK+2Tom's Hardware]gov.uk£316 million contract awarded to MBDA …Read moreBoost for Armed Forces as new laser weapon takes down …20 Nov 2025 — DragonFire achieves UK first in latest testing, taking down high-s…
In practice, the most resilient air-defence architecture combines lasers, electronic warfare, guns and missiles. Lasers add a valuable new option to the engagement queue, but the conditions of real combat ensure that backup layers remain essential. Weather changes, targets manoeuvre, terrain interferes and power is finite. The result is not a laser-only future but a more diverse and adaptable defensive stack. [GAO+2National Defense Magazine]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — DEWs are generally less effective the farther they are from the target…
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Endnotes
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Source: gao.gov
Title: gao 23 106717
Link: https://www.gao.gov/products/gao-23-106717Source snippet
Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — DEWs are generally less effective the farther they are from the target...
Published: May 2023
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Source: rand.org
Link: https://www.rand.org/pubs/commentary/2024/01/directed-energy-the-focus-on-laser-weapons-intensifies.htmlSource snippet
RAND CorporationDirected Energy: The Focus on Laser Weapons IntensifiesJan 25, 2024 — Physical limitations include the need for HELs to h...
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Source: GOV.UK
Link: https://www.gov.uk/government/news/boost-for-armed-forces-as-new-laser-weapon-takes-down-[high-speedSource snippet
Boost for Armed Forces as new laser weapon takes down...20 Nov 2025 — DragonFire achieves UK first in latest testing, taking down high-s...
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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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Source: arxiv.org
Link: https://arxiv.org/abs/2008.12461Source snippet
Counter-Unmanned Aircraft System(s) (C-UAS): State of the Art, Challenges and Future TrendsAugust 28, 2020...
Published: August 28, 2020
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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 weaponsApr 15, 2026 — Certainly, directed-energy weapons may be key to inexpensively countering miss...
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Source: nationaldefensemagazine.org
Title: government perspective directed energy in air base defense can save the arsenal
Link: https://www.nationaldefensemagazine.org/articles/2025/8/11/government-perspective-directed-energy-in-air-base-defense-can-save-the-arsenalSource snippet
High-power electromagnetic weapons require line-of-sight and are sensitive...Read more...
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Source: drillanddefense.com
Link: https://drillanddefense.com/laser-weapons-the-new-layer-in-modern-air-defense/Source snippet
Terrain, buildings, curvature, smoke, and obstacles affect engagement opportunities. Laser weapons...Read more...
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Link: https://www.tomshardware.com/tech-industry/pentagon-budget-documents-reveal-its-pursuing-containerized-300kw-laser-weapons-ambitious-joint-laser-weapon-system-designed-to-shoot-down-[cruise-missilesSource snippet
The JLWS is a containerized high-energy laser system intended to neutralize cruise missiles and other advanced threats. Designed to scale...
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Link: https://www.avinc.com/2026/03/04/the-math-problem-breaking-air-defense-and-why-lasers-change-it/Source snippet
AeroVironmentThe Math Problem Breaking Air Defense, And Why Lasers...4 Mar 2026 — RF-based systems will continue to play an important ro...
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Source: ft.com
Link: https://www.ft.com/content/c4c90a0e-303a-4445-85f8-54afbfbf23abSource snippet
Contratistas reconocidos como RTX, MBDA, y QinetiQ están invirtiendo significativamente en esta tecnología, que ha sido previamente consi...
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Source: thinkdefence.co.uk
Title: dragonfire laser weapon
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23 Feb 2026 — A powerful laser weapon will be added to the Royal Navy's arsenal in the next three years as the need for weapons to counte...
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The high-energy laser, developed through a collaboration of government, military, scientific, and commercial sectors, is intended to bols...
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Title: electronic warfare
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Additional References
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Cost-Effectiveness Analysis of Counter-Unmanned Aircraft...9 Mar 2026 — This quantitative study conducted a comprehensive cost-effective...
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An Urgent Matter of Drones: Lessons for NATO from UkraineRussia's war in Ukraine has revealed how important Drones (UAS) are in today's w...
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Anti Drone WeaponsCountering drone threats with anti-drone weapons. Explore the types, challenges, and future trends in the development o...
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DragonFire laser weapon takes down high-speed dronesAccording to the Ministry, the latest tests of DragonFire not only demonstrate its le...
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Laser weaponA laser weapon [2] is a type of directed-energy weapon (DEW) drones, and missiles. is atmospheric thermal [blooming]({{ 'blooming/' | relative_url }}), when t...
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Limitations of Ground-Based Counter-Drone SystemsConsider technology constraints: Many ground-based solutions are limited by line-of-sigh...
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Lasers and "Microwaves" Are Not Ready for...Jan 9, 2026 — Directed-energy weapons, including combat lasers and high-power microwave syst...
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US Moves To Deploy High Energy Laser Counter Drone...15 Apr 2026 — US clears high energy laser counter drone system for domestic airspac...
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UK's DragonFire Weapon Just Made Drones Completely USELESSThe UK's DragonFire laser is moving from testing into production, offering prec...
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Title: boost for armed forces as new laser weapon takes down high speed drones
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Defence Equipment & SupportBoost for Armed Forces as new laser weapon takes down...20 Nov 2025 — Britain's ground-breaking DragonFire la...
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