Laser weapons are leaving the demonstration phase. They are being integrated onto warships, mounted on tactical vehicles, and pushed toward operational air defense.
The appeal is well understood. Deep magazines. Low cost per shot. Speed-of-light engagement. A way to counter drones without expending an expensive missile every time a quadcopter shows up on radar.
That promise is real. The hard part starts now.
A high-energy laser needs power, but the source is only the beginning. That energy has to travel through mirrors, windows, beam directors, and coated optical surfaces without losing focus, stability, or too much heat along the way.
In a laboratory, that is a solved engineering problem, but in the field, it’s where laser defense systems are starting to break.
The Test Range Is Not the Battlefield
The transition from demonstration to deployment is already underway — and so is the first contact with reality.
Lockheed Martin’s HELIOS system has been integrated on USS Preble since 2022, and the ship used it to down at least one drone during testing in 2024.
Israel delivered the first operational Iron Beam high-power laser system to its armed forces in December 2025.
The US Army deployed four DE M-SHORAD prototype vehicles, a 50 kW-class laser on a Stryker chassis, to support overseas operations in 2024.
Laser weapons have been shown to defeat drones. The harder question is whether they can keep doing it when conditions are no longer controlled: when the air is salty, the temperature is swinging, and the maintenance crew is working from a forward operating base rather than a clean room.
Power Is Only Useful If the Beam Stays Usable
Most public debate on directed energy fixates on kilowatts. That makes sense as far as it goes. Without enough power, there is no effective weapon.
But raw power is not the same as delivered effect. Between the laser source and the target sits an optical train — coated mirrors, lenses, and beam-directing surfaces — and the condition of those components determines how much of that power arrives at the target in usable form.
At high power densities, small losses compound fast. A coating with even trace levels of absorption converts laser energy into heat. That heat distorts the optical surface, change materiel behavior, and disturb the beam, layers, and degrades the beam wavefront. The focal spot widens. Transmission drops. On-target irradiance falls below what the engagement requires.
The system still fires. Nothing may look obviously broken. But the weapon is delivering less than its rated capability, and the margin keeps narrowing with each shot.
That is the dangerous kind of degradation: gradual, invisible from the outside, and easy to miss until a mission fails.
The Maintenance Problem Is Already Visible
This is not a theoretical concern and is already showing up in the field.
In August 2025, Defense News reported that the US Army was preparing a 2026 competition for a more enduring counter-drone laser weapon, after operational experimentation revealed that sustainment in “rough and dirty environments” still needed work.
The most direct assessment came from Col. Adam Miller, who leads directed-energy programs at the Army’s Rapid Capabilities and Critical Technologies Office: “The optics on these systems are one of the high failure rate items and one of the challenges that we have.”
That comment moves the optics problem out of the laboratory and into operational reality.
A laser weapon can have a powerful source, capable tracking software, and a well-defined tactical role. If the optical train cannot survive the deployed environment, readiness collapses.
The system does not need to go dark to become combat-ineffective. It only needs to lose enough beam quality or transmission to make engagements slower, less reliable, or shorter than the engagement demands.
Optical Damage Is Not Always Immediate
Laser optics are typically discussed in terms of damage thresholds: stay below the limit, the optic survives; exceed it, the optic fails.
Real exposure is messier.
A 2024 paper in Applied Optics examining multilayer dielectric mirrors found that damage resistance is not a fixed property.
In short-pulse regimes, repeated irradiation can reduce the damage threshold through accumulated laser fatigue, meaning that an optic operating safely within its rated parameters today may be progressively more vulnerable to failure with each subsequent engagement.
Contamination introduces a separate failure pathway. Research on high-power continuous-wave laser exposure has shown that absorbing particles on an optical surface can reach extremely high temperatures under illumination before evaporating, leaving behind surface modifications that degrade subsequent performance.
On a naval platform, that particle is salt. On a ground vehicle, it is dust. On an airborne system, pressure swings and temperature cycling add further load.
The details vary by platform. The principle is consistent: laser optics are being asked to sustain performance under conditions that bear almost no resemblance to the clean handling and controlled environments of acceptance testing.
The Next Test Is Endurance
Atmospheric effects on laser weapons are already well-documented. Rain, fog, smoke, dust, and turbulence scatter and absorb the beam.
The Congressional Research Service has flagged water vapor as a particular challenge for shipboard systems, and thermal blooming — where the beam heats the air along its path and defocuses itself — as a limiting factor for sustained engagement.
Those same environmental conditions place stress on the optical system itself as well. Humidity, thermal cycling, vibration, and contamination all affect the optical path. As coatings absorb more energy, the system has more heat to manage internally. As surfaces change, beam quality degrades.
From the outside, this may not look dramatic. Inside the weapon, small changes can decide whether it remains reliable.
Directed energy has demonstrated genuine military utility. Low-cost shots against expensive threats are strategically attractive, and the drone threat has made that calculus more urgent by the month.
But the future of laser defense will not be decided by the first successful intercept.
It will be decided by the hundredth shot, and the thousandth. By the system that still performs after months of salt air and desert dust, vibration and imperfect maintenance, repeated cleaning and redeployment.
Laser defense has proved it can work. Now it has to prove it can last.
Martynas Adomaitis is the Defense and Space Development Manager at OPTOMAN, where he works on advanced optical solutions for aerospace and defense applications.
He holds a Master’s degree in Physics and Optical Physics from Vilnius University and specializes in laser optics, ion beam sputtering coatings, and high-performance laser optics.
The views expressed are those of the author and do not necessarily reflect the editorial position of NextGen Defense.
Got a perspective on the future of defense or emerging technology? Write for NextGen Defense and share your ideas.
