Can high-power lasers nudge space junk out of our orbit?
As mega-constellations crowd Low Earth Orbit, the risk of satellite collisions is climbing. Scientists are now testing a bold solution: using ground-based lasers to physically push debris away from active spacecraft, potentially safeguarding the future of global communications and navigation.
The orbital environment is facing an unprecedented challenge. Over the last decade, the number of objects in Low Earth Orbit has grown rapidly, largely driven by the deployment of massive satellite mega-constellations. This surge in resident space objects increases the likelihood of collisions between defunct debris and operational assets, which can shorten mission lifetimes and drive up the costs of collision avoidance maneuvers.
To combat this, the European Space Agency (ESA) is advancing a concept known as OMLET (Orbit Maintenance via Laser Momentum Transfer). Unlike current laser technology used at the Izaña station for mere monitoring, OMLET aims to use high-power laser radiation to actively change the trajectory of debris. By utilizing a platform equipped with adaptive optics and precision pointing, the system would apply small, controlled velocity changes to objects through momentum transfer.
The project is currently in the Phase A/B1 stage, moving from initial requirements toward design and implementation. An international consortium, headed by the German Aerospace Centre’s (DLR) Institute of Technical Physics, is leading this effort. While the technology faces significant technical and regulatory hurdles, a NASA cost-benefit study suggests that deploying ground-based lasers for just-in-time collision avoidance could yield net benefits in under ten years.
If successful, the OMLET Engineering Station will serve as a testing ground for in-orbit demonstrations. The ultimate goal is to transition from experimental engineering to a functional service capable of providing precise orbital data and active collision avoidance, ensuring a more sustainable space environment.
Source: Moving space debris out of the way with OMLET
