Within Laser vs Microwave
When Is A Laser The Cleaner Kill?
A narrow laser beam can be the better choice when the defender needs to defeat one visible drone with controlled effects.
On this page
- Why dwell time can still work against one target
- How precision changes collateral risk decisions
- Where lasers lose advantage in poor beam paths
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Introduction
When a defender faces a single visible drone, a laser can be the better directed-energy option than a high-power microwave weapon. The reason is not that lasers are universally more effective. It is that they allow the operator to place energy on one specific target and often on one specific component of that target. In situations where discrimination, controlled effects and predictable engagement outcomes matter, the laser’s narrow beam can outweigh the broader-area advantages that make microwave weapons attractive against larger raids or swarms. [GAO]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — For example, wider beam DEWs, such as high power microwave or millimete…
This distinction has become increasingly important as small drones appear near airbases, ships, critical infrastructure and civilian areas. Defenders are often choosing between a weapon that concentrates energy on a single aim point and one designed to affect electronics across a wider volume. For a lone drone, the cleaner answer is frequently the laser.
Why Dwell Time Can Still Work Against One Target
One of the most common criticisms of laser weapons is that they require dwell time: the beam must remain on the target long enough to create a damaging thermal effect. Against a fast-moving threat, this requirement can be a disadvantage.
For a single drone, however, dwell time is often manageable. Modern tracking systems can maintain a stable aim point on a lone target, allowing energy to accumulate on a vulnerable area such as a propeller, motor housing, sensor window or structural component. The engagement becomes a focused engineering problem rather than a race to affect many targets simultaneously. [Office of Naval Research]onr.navy.milOffice of Naval ResearchCounter Directed Energy Weapons and High Energy LasersThe intent is to increase accuracy in all weather condition…
Recent DragonFire trials in the United Kingdom illustrate this logic. The system successfully tracked and destroyed high-speed drones travelling up to roughly 650 km/h while demonstrating above-the-horizon tracking and engagement. These tests were notable not because lasers suddenly eliminated the need for dwell time, but because tracking and beam-control systems had advanced enough to keep energy concentrated on a specific target long enough to achieve a kill. [GOV.UK]GOV.UKboost for armed forces as new laser weapon takes down high speed dronesBoost for Armed Forces as new laser weapon takes down…20 Nov 2025 — Britain's ground-breaking DragonFire laser has shot down high-spee…
Microwave weapons approach the problem differently. They attempt to couple electromagnetic energy into electronic systems rather than physically heating a precise spot. That can be highly effective, but the wider-area approach offers less benefit when there is only one drone to defeat. In that scenario, the laser’s ability to stay focused on a single object becomes a strength rather than a limitation. [Office of Naval Research]onr.navy.milOffice of Naval ResearchDirected Energy Weapons: High Power MicrowavesHPM weapons create beams of electromagnetic energy over a broad spe…
How Precision Changes Collateral-Risk Decisions
The strongest case for a laser against a single drone is often not technical performance but discrimination.
A high-energy laser can be directed at one identified object with extremely narrow beam geometry. Military programmes such as DragonFire have repeatedly highlighted precision measured in coin-sized aim points at significant distances. That level of control allows operators to engage a specific drone while minimising effects on nearby aircraft, friendly drones, sensors or civilian infrastructure. [gCaptain]gcaptain.comuk fast tracks naval laser weapon after successful high speed drone trialsUK Fast-Tracks Naval Laser Weapon After Successful High…24 Nov 2025 — The system demonstrated its ability to detect, track, en…
High-power microwave systems operate under a different philosophy. According to the US Office of Naval Research, they are intended to interact with electronics across a targeted area. The US Government Accountability Office notes that wider-beam directed-energy systems may affect assets in the engagement zone regardless of whether they are friendly or hostile. [Office of Naval Research]onr.navy.milOffice of Naval ResearchDirected Energy Weapons: High Power MicrowavesHPM weapons create beams of electromagnetic energy over a broad spe…
That difference matters in several practical situations:
- Near civilian infrastructure. A defender may want to disable one suspicious drone without risking unintended effects on nearby electronics.
- Around friendly unmanned systems. Friendly drones operating in the same airspace may be vulnerable to broader electromagnetic effects.
- At sea or near airports. Precision can reduce concerns about interference with nearby systems that are not part of the engagement.
- During identification-sensitive operations. A laser allows the operator to select a particular target rather than treating an area as hostile.
The result is that a laser often offers a more predictable engagement outcome when only one drone requires action. [GAO]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — For example, wider beam DEWs, such as high power microwave or millimete…
What A “Cleaner Kill” Actually Means
The phrase “cleaner kill” does not necessarily mean total destruction. In many counter-drone scenarios, the objective is simply to stop the aircraft from completing its mission.
A laser can achieve this through several mechanisms:
- Damaging or obscuring optical sensors.
- Heating structural elements until failure occurs.
- Disabling propulsion components.
- Creating localised damage that forces loss of control.
Because the energy is concentrated on a specific point, operators may have greater confidence about what caused the failure and which target was affected. The engagement chain is often easier to observe and assess visually. [LinkedIn]linkedin.comTechnical Evolution and Operational Integration of Directed…Directed-energy performance claims are especially sensitive to ran…
Microwave effects can be harder to characterise. A drone may suffer temporary disruption, permanent electronic damage or partial degradation depending on design, shielding and component resilience. While that flexibility can be useful, it can also make effects less deterministic on a single target. [Office of Naval Research]onr.navy.milOffice of Naval ResearchDirected Energy Weapons: High Power MicrowavesHPM weapons create beams of electromagnetic energy over a broad spe…
For commanders who need a clear answer to the question “Did that specific drone stop flying because we engaged it?”, the laser often provides the more straightforward path.
Where Lasers Lose Advantage In Poor Beam Paths
The laser’s advantages depend on maintaining a high-quality beam path between weapon and target.
Atmospheric conditions remain one of the most important constraints. Fog, rain, smoke, dust and turbulence can scatter, absorb or distort laser energy before it reaches the drone. Thermal blooming and other propagation effects can further reduce performance as range increases. Government and military research programmes continue to improve tracking and beam-control technology, but these physical limitations have not disappeared. [GAO]gao.govgao 23 106717Science & Tech Spotlight: Directed Energy Weapons25 May 2023 — For example, wider beam DEWs, such as high power microwave or millimete…
This is where microwave weapons can regain an advantage. Microwave systems are generally less dependent on maintaining an extremely precise optical path and are often described as more tolerant of adverse environmental conditions. Their broader beam geometry also reduces the need for pinpoint tracking. [K-State Libraries Pressbooks]kstatelibraries.pressbooks.pubK-State Libraries Pressbooks11DE Weapons & Microwavesby C Carter · 2022 — Microwave weapons are far less sensitive to atmospheric disturbances than lasers, making them…
As a result, the laser’s superiority against a single drone is conditional rather than absolute. The cleaner solution exists only when the weapon can reliably see and illuminate the target.
The Practical Decision Point
In the broader debate between lasers and microwaves for air defence, the simplest rule is that lasers become most attractive when the defender values discrimination more than area coverage.
If the challenge is one identified drone, visible to sensors, operating in an environment where collateral effects matter, a laser often provides the most controlled engagement available among directed-energy options. Its need for tracking and dwell time is offset by its ability to place energy exactly where the operator intends. [GOV.UK]GOV.UKboost for armed forces as new laser weapon takes down high speed dronesBoost for Armed Forces as new laser weapon takes down…20 Nov 2025 — Britain's ground-breaking DragonFire laser has shot down high-spee…
Microwave weapons remain powerful tools, particularly when many drones must be addressed quickly or when broader electronic effects are desirable. But for the narrow problem of defeating a single drone with the greatest possible precision, the laser’s focused beam is frequently the cleaner kill. [INSS]inss.org.ilINSSBetter than the laser interceptor?The microwave weapon! | INSS1 Apr 2024 — Microwave weapons have significant operational advantages. They are cost-effective, simple weapo…
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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 — For example, wider beam DEWs, such as high power microwave or millimete...
Published: May 2023
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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...Directed-energy performance claims are especially sensitive to ran...
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Source: GOV.UK
Title: boost for armed forces as new laser weapon takes down high speed drones
Link: https://www.gov.uk/government/news/boost-for-armed-forces-as-new-laser-weapon-takes-down-high-speed-dronesSource snippet
Boost for Armed Forces as new laser weapon takes down...20 Nov 2025 — Britain's ground-breaking DragonFire laser has shot down high-spee...
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Source: inss.org.il
Title: INSSBetter than the laser interceptor?
Link: https://www.inss.org.il/social_media/better-than-the-laser-interceptor-the-microwave-weapon/Source snippet
The microwave weapon! | INSS1 Apr 2024 — Microwave weapons have significant operational advantages. They are cost-effective, simple weapo...
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Source: gcaptain.com
Title: uk fast tracks naval laser weapon after successful high speed drone trials
Link: https://gcaptain.com/uk-fast-tracks-naval-laser-weapon-after-successful-high-speed-drone-trials/Source snippet
UK Fast-Tracks Naval Laser Weapon After Successful High...24 Nov 2025 — The system demonstrated its ability to detect, track, en...
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Source: kstatelibraries.pressbooks.pub
Title: K-State Libraries Pressbooks11
Link: https://kstatelibraries.pressbooks.pub/drone-delivery/chapter/11-microwaves/Source snippet
DE Weapons & Microwavesby C Carter · 2022 — Microwave weapons are far less sensitive to atmospheric disturbances than lasers, making them...
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Source: gao.gov
Title: gao 23 105868
Link: https://www.gao.gov/products/gao-23-105868Source snippet
Directed Energy Weapons: DOD Should Focus on...17 Apr 2023 — Additionally, the departments developed a range of high power microwave cap...
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Source: airpower.airforce.gov.au
Title: airforce.gov.au Directed Energy Weapons
Link: https://airpower.airforce.gov.au/sites/default/files/2021-03/BPAF03_Directed-Energy-Weapons.pdfSource snippet
Energy Weapons - Air and Space Power CentreA DEW is a weapon system that uses an energy source and a pointing system to control the deliv...
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Source: gao.gov
Link: https://www.gao.gov/video/directed-energy-weapons-dod-should-focus-transition-planningSource snippet
Directed Energy Weapons DOD Should Focus on Transition...DOD spends about $1 billion annually on directed energy--concentrated electroma...
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Source: onr.navy.mil
Link: https://www.onr.navy.mil/organization/departments/code-35/division-353/directed-energy-weapons-high-power-microwavesSource snippet
Office of Naval ResearchDirected Energy Weapons: High Power MicrowavesHPM weapons create beams of electromagnetic energy over a broad spe...
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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
Office of Naval ResearchCounter Directed Energy Weapons and High Energy LasersThe intent is to increase accuracy in all weather condition...
Additional References
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Source: instagram.com
Link: https://www.instagram.com/reel/DRUtM8hDKZS/?hl=enSource snippet
UK Government Scotland on Instagram: "Introducing...The British Ministry of Defence released the first video footage of its DragonFire l...
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Link: https://www.unmannedairspace.info/counter-uas-systems-and-policies/us-gao-report-directed-energy-weapon-technical-maturity-levels-still-lagging/Source snippet
directed energy weapon technical maturity levels still laggingThe DoD current spends about USD1 billion annually on directed energy—conce...
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Source: twz.com
Title: lasers microwaves missiles guns not on the table for domestic drone defense
Link: https://www.twz.com/air/lasers-microwaves-missiles-guns-not-on-the-table-for-domestic-drone-defenseSource snippet
Lasers, Microwaves, Missiles, Guns Not On The Table For...31 Oct 2024 — At the same time, even lower tiers of counter-drone weapons, suc...
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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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Title: war at the speed of light the emerging role of directed energy weapons
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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: coherentmarketinsights.com
Title: directed energy weapons in counter drone missile defense 3576
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Directed Energy Weapons in CounterDrone Missile Defense4 May 2026 — These include energy beams like laser, microwave, or radio frequency...
Published: May 2026
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Source: calibredefence.co.uk
Title: more lasers dragonfire downs high speed drone in [uk trials]({{ ‘uk-trials/’ | relative_url }})
Link: https://www.calibredefence.co.uk/more-lasers-dragonfire-downs-high-speed-drone-in-uk-trials/Source snippet
More lasers: DragonFire downs high speed drone in UK trials22 Nov 2025 — The UK's Defence Science Technology Laboratory (DSTL) has tested...
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Source: facebook.com
Link: https://www.facebook.com/groups/930540941927100/posts/1258521139129077/Source snippet
les and guns, with an almost unlimited firing capacity, and...Read more...
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Source: electronicsforu.com
Title: directed energy weapons high power microwaves
Link: https://www.electronicsforu.com/market-verticals/directed-energy-weapons-high-power-microwavesSource snippet
Electronics For YouDirected Energy Weapons: High Power Microwaves4 Oct 2016 — HPM weapons generate an intense blast of microwave energy s...
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re weight for microwave shielding means it's potentially...
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