Directed energy weapons are military systems that use concentrated electromagnetic energy rather than bullets, shells or blast fragments to affect a target.

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What directed energy weapons actually do

The phrase “directed energy weapon” covers several technologies, but the core idea is simple: the system points energy at a target and produces an effect without launching a physical projectile. The US Department of Defense definition used in Congressional Research Service reporting describes directed energy weapons as using concentrated electromagnetic energy to “incapacitate, damage, disable, or destroy” enemy equipment, facilities or personnel. In current defence programmes, the two main families are high-energy lasers and high-power microwave systems; particle-beam weapons are sometimes discussed historically, but they sit outside most current unclassified operational programmes. [Every CRS Report]everycrsreport.comEvery CRS Report HTMLDepartment of Defense Directed EnergyEvery CRS ReportHTMLDepartment of Defense Directed Energy July 11, 2024. Weapons: Background and Issues for Congress Kelley M. Sayler, Di…Published: July 11, 2024

Overview image for Directed Ener High-energy lasers work by focusing light onto a point on the target. Depending on power, range, dwell time and target material, the effect may be to blind or confuse a sensor, overheat a drone component, burn through a casing, or damage a munition. A laser’s appeal is precision: it can put energy onto a small aim point at the speed of light. Its weakness is also tied to that mechanism. The laser needs to keep enough energy on the relevant spot for long enough, which is harder against fast, manoeuvring, reflective, shielded or distant targets.

High-power microwave weapons work differently. Instead of heating one spot with a beam of light, they emit electromagnetic energy intended to disrupt or damage electronics. That can make them attractive against drone swarms, because a wider microwave beam may affect multiple small unmanned aircraft in one engagement. The trade-off is discrimination: a wide-area electromagnetic effect can be harder to confine neatly than a narrow laser beam, especially around friendly or civilian electronics. GAO notes this operational problem directly: wider-beam systems may affect assets in an area whether friend or foe. [GAO]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — DEWs are generally less effective the farther they are from the target…Published: May 2023

Why militaries want them now

The strongest reason for today’s directed-energy push is not futuristic glamour. It is cost, magazine depth and the spread of drones. A force defending a ship, base or convoy may not want to spend a costly interceptor missile on a small unmanned aircraft if a cheaper defensive layer can do the job. RAND’s 2024 analysis framed laser weapons as a potential way to relieve pressure on stretched munitions stocks while defending against proliferating threats, including the kinds of drone and missile pressures seen around Ukraine and the Red Sea. [RAND Corporation]rand.orgIf the technology can be matured,RAND CorporationDirected Energy: The Focus on Laser Weapons IntensifiesJanuary 25, 2024 — 25 Jan 2024 — Directed energy weapons offer a m…Published: January 25, 2024

The “cost per shot” argument is powerful but easy to overstate. The UK Ministry of Defence said in January 2024 that its DragonFire laser achieved the UK’s first high-power firing against aerial targets and described the system as having low long-term costs; the Royal Navy separately said a DragonFire burst costs no more than £10 in energy. That figure does not mean the weapon system is cheap to buy, integrate or maintain, but it explains why armed forces are interested in using lasers against low-cost drones rather than relying only on missile interceptors. [GOV.UK]GOV.UKAdvanced future military laser achieves UK firstJanuary 19, 2024 — 19 Jan 2024 — The DragonFire laser directed energy weapon (LDEW) system achieved the UK's first high-power firing of a…Published: January 19, 2024

A second reason is speed. Directed energy travels at or near the speed of light, so there is no ballistic flight time in the ordinary sense. That makes it attractive for short-warning defensive engagements. But speed of engagement is not the same as guaranteed kill. A laser may still need seconds of dwell time on a vulnerable aim point, and a microwave system may need favourable geometry and sufficient field strength at the target. Directed energy shortens part of the engagement chain, but it does not remove the need to detect, classify, track, aim and assess effects.

Directed Ener illustration 1

Lasers: precision with atmospheric strings attached

High-energy lasers are the most visible directed energy weapons because they resemble what many people imagine: a beam aimed at a drone, boat, mortar round or missile. In reality, most military laser work is less cinematic. The critical tasks are beam quality, tracking, stabilisation, power supply, cooling and fire-control integration. A naval laser, for example, must work on a moving ship against a moving target in salt air, haze, rain, spray and clutter.

The US Navy’s HELIOS system shows both the promise and the incremental nature of the field. The Office of the Director, Operational Test and Evaluation reported that the Center for Countermeasures supported a Navy demonstration on USS Preble to verify and validate HELIOS performance against an unmanned aerial vehicle target. Navy Times, citing the same FY2024 testing record, reported that Preble fired HELIOS at an aerial drone during a 2024 weapons test. [Dote]dote.osd.milDote Center for Countermeasures (CCMDote Center for Countermeasures (CCM

The UK’s DragonFire programme provides another concrete example. In January 2024, the Ministry of Defence said DragonFire had achieved the UK’s first high-power firing of a laser weapon against aerial targets at the Hebrides Range, while emphasising that it is a line-of-sight weapon. In July 2024, the UK government also announced a separate trial in which a high-powered laser was fired from a British Army combat vehicle and neutralised targets at distances above 1 km. [GOV.UK]GOV.UKAdvanced future military laser achieves UK firstJanuary 19, 2024 — 19 Jan 2024 — The DragonFire laser directed energy weapon (LDEW) system achieved the UK's first high-power firing of a…Published: January 19, 2024

The main technical catch is propagation through the real atmosphere. Fog, storms, aerosols, turbulence and thermal blooming can reduce range and beam quality. Thermal blooming occurs when a high-energy beam heats the air along its path, changing the refractive index and causing the beam to spread or distort. GAO lists atmospheric conditions and cooling requirements among the limits on directed-energy effectiveness, and technical studies of laser propagation treat atmospheric variation as central to understanding operational performance. [GAO+2Afit]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — DEWs are generally less effective the farther they are from the target…Published: May 2023

Microwaves: useful against swarms, harder to aim narrowly

High-power microwave weapons are especially interesting for counter-drone defence because they can attack electronics rather than airframes. A quadcopter does not need to be physically shattered if its control, navigation, power management or onboard electronics fail. This is why microwave systems are often described as counter-electronics weapons rather than conventional air-defence weapons.

The US Air Force Research Laboratory’s THOR programme is a clear example. AFRL describes THOR as a high-power microwave counter-drone weapon, and in a 2023 swarm demonstration an AFRL official said the system was effective at disabling a swarm with a wide beam, high peak powers and a fast-moving gimbal. The important distinction from a laser is the one-to-many effect: a laser typically engages a target by keeping a narrow beam on it, while a microwave system may be able to affect multiple drones within a broader volume. [Air Force Research Laboratory]afrl.af.milrl conducts swarm technology demonstrationAir Force Research LaboratoryAFRL conducts swarm technology demonstration16 May 2023 — “THOR was exceptionally effective at disabling the…Published: May 2023

Commercial and military interest has also grown around Epirus’s Leonidas family of high-power microwave systems. Reuters reported in 2025 that Epirus had raised $250 million to scale anti-drone weapons, noting its earlier US Army contract for Leonidas. Axios reported that the Army received four prototype high-power microwave systems under a rapid acquisition effort intended to strengthen defence against unmanned aircraft. [Reuters]reuters.comDefense tech startup Epirus secures $250 million to make anti-drone weaponsDefense tech startup Epirus secures $250 million to make anti-drone weapons

The advantage of high-power microwave weapons is also their complication. A broad electromagnetic effect can be valuable against a swarm, but it raises questions about collateral effects on nearby friendly systems, civilian infrastructure and mixed airspace. These systems also require careful testing because “did the target fall?” is not always enough: operators need to know what component failed, whether the effect is repeatable, how the beam behaves at range, and how hardened electronics respond. DOT&E’s FY2024 reporting shows the US test community developing specialised instrumentation for high-energy laser and high-power microwave evaluation, including hardened unmanned aircraft and field-mapping tools for HPM beam profiles. [Dote]dote.osd.milDote Center for Countermeasures (CCMDote Center for Countermeasures (CCM

Directed Ener illustration 2

Where directed energy fits in real defence

Directed energy weapons are most credible today as part of layered defence. That means they sit alongside electronic warfare, guns, interceptor missiles, decoys, cyber and passive protection rather than replacing them. A laser may be well suited to a small drone in clear weather; a missile may still be needed for a fast, complex or distant threat; electronic warfare may defeat a drone before any weapon fires; and a microwave system may be useful if several drones arrive together.

This layered role matters because military targets differ enormously. A cheap commercial-style drone, a hardened military unmanned aircraft, a mortar round, a cruise missile and a hypersonic weapon all present different engagement problems. Directed energy is not one universal answer to all of them. CRS reporting notes that potential missions for high-energy lasers include short-range air defence, counter-unmanned aircraft systems and counter-rocket, artillery and mortar roles, but it also frames these systems as programmes still facing questions of maturity, coordination, funding and transition. [Every CRS Report]everycrsreport.comEvery CRS Report HTMLDepartment of Defense Directed EnergyEvery CRS ReportHTMLDepartment of Defense Directed Energy July 11, 2024. Weapons: Background and Issues for Congress Kelley M. Sayler, Di…Published: July 11, 2024

The US Army’s DE M-SHORAD experience illustrates the gap between promising prototypes and mature acquisition. DOT&E reported that in February 2024 the Army deployed four Directed Energy Maneuver-Short Range Air Defense prototype vehicles for overseas operations, which prevented planned scientific and technical testing from starting. The same report stated that adequate testing to demonstrate operational effectiveness, lethality, suitability and survivability could not begin until the prototypes returned or additional vehicles were built. [Dote]dote.osd.milDote Directed Energy Maneuver-Short Range Air Defense (DEDote Directed Energy Maneuver-Short Range Air Defense (DE

This is a recurring theme: directed energy systems can be impressive in trials, but defence organisations still need evidence about reliability, maintainability, operator training, rules of engagement, logistics, weather envelopes, safety and integration with command-and-control systems. GAO’s 2023 assessment found that the Department of Defense was making progress but still faced challenges transitioning prototypes into acquisition programmes. [GAO]gao.govgao 23 105868gao 23 105868

What directed energy weapons are not

Directed energy weapons are often misunderstood because the term sounds broader and more mysterious than most real systems are. A military laser is not a magic beam that instantly deletes any target. It is a power, optics, tracking and thermal-management system that must deliver enough energy to a vulnerable point under real-world conditions. A microwave weapon is not simply an “EMP” in the popular sense; its effects depend on frequency, pulse characteristics, power, distance, geometry and the target’s electronic susceptibility.

They are also not automatically “non-lethal”. Some systems are designed to destroy or disable equipment; others are designed for non-lethal counter-personnel effects. The Active Denial System, for example, is a millimetre-wave directed energy system that produces an intolerable heating sensation on the skin. A 2025 Defense Department release described it as a non-lethal counter-personnel directed-energy weapon, while medical and human-rights discussions have long focused on risks, operator control, burns, panic, vulnerable people and misuse. [DVIDS]dvidshub.netdod shows off non lethal energy weapondod shows off non lethal energy weapon

Nor are directed energy weapons “unlimited ammunition” in a simple sense. They do not require a magazine full of missiles or shells, but they are limited by power generation, cooling, component durability, target availability, line of sight and engagement rate. A ship or vehicle can run out of practical firing capacity if its system overheats, loses tracking quality, cannot generate enough power while performing other missions, or faces targets outside its effective envelope.

Law and ethics: the blinding-laser line

Directed energy weapons are governed by the same core laws of armed conflict as other weapons: distinction, proportionality, precautions and the prohibition on weapons that cause unnecessary suffering. There is also one highly specific treaty rule: blinding laser weapons are banned. Protocol IV to the Convention on Certain Conventional Weapons prohibits laser weapons specifically designed, as their sole combat function or one of their combat functions, to cause permanent blindness to unenhanced vision. [Geneva UNODA]geneva-s3.unoda.orgOpen source on unoda.org.

This ban is important because it shows that directed energy has already produced a successful preventive arms-control rule. UNIDIR notes that blinding laser weapons have been banned as a means or method of warfare since the 1995 Protocol IV to the CCW. The rule does not ban all military lasers: rangefinders, target designators, dazzlers and anti-sensor systems may still exist, but states must take feasible precautions to avoid permanent blindness when using laser systems. UNIDIR → Building a more secure world. [unidir.org]unidir.orgOpen source on unidir.org.

Microwave and millimetre-wave weapons raise different ethical questions. The issues are less about permanent blindness and more about reversibility, hidden injury, effects on electronics, wide-area impact, use in populated environments and accountability when harm is difficult to observe immediately. International humanitarian law does not stop applying because a weapon is “non-kinetic”; the practical challenge is proving and reviewing effects that may be invisible, temporary, electronic or delayed. [International Review of the Red Cross]international-review.icrc.orgOpen source on icrc.org.

Directed Ener illustration 3

The hard engineering behind the promise

The public debate often focuses on dramatic firing tests, but the decisive work is less visible. Directed energy weapons need robust beam directors, adaptive optics, sensors, target tracking, battle-management integration, thermal control, safety systems and maintainable components. They also need test ranges and instrumentation capable of measuring the delivered energy and the actual target effect.

GAO’s 2023 report warned that the Department of Defense’s directed-energy transition efforts faced acquisition challenges even as development progressed. DOT&E’s later reporting shows why: the test enterprise has had to build tools such as free-flying target boards for laser performance, laser irradiance target boards, safe beam backstops, hardened unmanned aircraft for high-power microwave measurement and instrumentation for mapping HPM beams. These are not cosmetic details; without them, a force cannot confidently say what a weapon did, why it worked, or when it will fail. [GAO]gao.govgao 23 105868gao 23 105868

Supply chains are another constraint. A 2024 National Defense Industrial Association report on directed-energy weapon supply chains examined critical raw materials, manufacturing base and workforce, supply-chain security and allied industrial partnerships. That is a reminder that scaling a prototype into a deployable inventory is not just a physics problem; it also depends on specialised optics, electronics, thermal systems, manufacturing capacity, software skills and defence procurement stability. [National Defense Industrial Association]ndia.orgOpen source on ndia.org.

The most realistic near-term future

The near-term future of directed energy is likely to be uneven but important. Lasers and high-power microwave systems are most likely to expand first in counter-drone, short-range air defence, ship self-defence, base defence and selected counter-sensor roles. These are missions where low cost per engagement, deep magazines and rapid response can matter immediately.

The most credible systems will not be judged by a single impressive shoot-down video. They will be judged by whether operators can keep them running in bad weather, dusty air, salt spray, high tempo, crowded electromagnetic environments and ambiguous engagements. The strongest programmes will be those that integrate directed energy into existing sensors, command systems and rules of engagement rather than treating the weapon as a standalone novelty.

The central takeaway is therefore balanced: directed energy weapons are no longer just laboratory curiosities, but they are not yet a universal battlefield revolution. They are becoming practical in specific defensive niches, especially against drones and some sensors, while still facing physics, engineering, testing, legal and operational constraints. Their real significance lies in adding a new layer to defence: one that can sometimes replace an expensive interceptor with electrical energy, but only when the target, environment and system design all line up.

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Endnotes

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Additional References

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    Exploring Directed Energy Weapons and the Implications of Their Use Under International Law...

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    Eurosatory Day 2: Laser Weapons Go Operational & France Unveils B-Strike Missiles...

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    LOCUST® X3 Modular Directed Energy Laser Weapon System...

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