Buried two floors beneath the University of Texas at Austin campus sits one of the most powerful lasers in the United States — a machine capable of briefly generating more power than the entire US electrical grid. Ahmed Helal, who served as the lead laser scientist on the Texas Petawatt from 2020 to 2024, offers a rare firsthand account of operating the facility, which has since been shuttered due to federal funding cuts.
A Machine Hidden in Plain Sight
Most students walking past the Physics, Math, and Astronomy building at the University of Texas at Austin have no idea what lies beneath them. Two floors underground, behind heavy double doors bearing a logo few have noticed, sits the Texas Petawatt laser — a research instrument so powerful it briefly outpaces the entire American power grid in energy delivery.
Ahmed Helal, who led the facility's laser science team for four years until 2024, describes the machine in striking terms. The laser works by taking an extraordinarily brief pulse of light, stretching it in time so that amplification doesn't destroy the optics, then boosting it to enormous energy levels before compressing it back down to a duration of roughly one trillionth of a second. The result, focused into a vacuum chamber, is something scientists describe as a miniature star.
What a Shot Day Looks Like
Operating such a system is not a casual undertaking. Shot days — the term used for sessions when the laser actually fires — involve extensive preparation, safety checks, and coordination between teams of scientists. The facility operated as part of LaserNetUS, a Department of Energy network that allowed researchers from across the country to apply for scheduled time on specialised high-power laser equipment. The Texas Petawatt was one of the network's flagship installations.
The laser falls into a class known as petawatt lasers, meaning they can deliver power on the order of one quadrillion watts — albeit for only a fleeting instant. That combination of extreme power and extreme brevity is precisely what makes them scientifically useful. Researchers use such facilities to study plasma physics, investigate the behaviour of matter under extreme conditions, and explore applications ranging from medical physics to national security research.
Funding Cuts Silence the Machine
Despite its scientific significance, the Texas Petawatt is currently offline. Helal confirms the facility has been closed due to funding cuts, a development that has raised concern among the research community that depends on access to such specialised infrastructure.
LaserNetUS, the broader Department of Energy network of which the Texas Petawatt was a part, was established to ensure that American researchers maintained access to world-class high-power laser capabilities. The closure of one of its most prominent nodes highlights the vulnerability of large-scale scientific infrastructure to budgetary pressures.
The United States has historically competed with Europe and Asia in the development of high-intensity laser technology. Facilities such as the Extreme Light Infrastructure in Europe have invested heavily in petawatt-class systems, and observers note that sustained federal investment is critical for the US to maintain its position at the frontier of this research.
Analysis
Why This Matters
- The closure of the Texas Petawatt represents a direct loss of scientific capacity for researchers across the US who relied on LaserNetUS facilities for experiments that cannot be conducted anywhere else.
- High-power laser research underpins advances in fusion energy, medical physics, materials science, and national defence — fields with significant long-term strategic and economic implications.
- The account draws public attention to the fragility of large-scale scientific infrastructure when federal funding is inconsistent or reduced.
Background
Petawatt lasers emerged from decades of development in ultrafast optics, particularly following the invention of chirped pulse amplification (CPA) in the 1980s — a technique that won its inventors the Nobel Prize in Physics in 2018. CPA is precisely the stretching-and-compressing method Helal describes: it made it possible to amplify laser pulses to extreme powers without destroying the optical components in the process.
The United States Department of Energy established LaserNetUS in 2018 to consolidate and share access to the country's growing fleet of high-power laser facilities. The network was designed to function like a national user facility, allowing university and government researchers to apply for beam time in the same way astronomers apply for telescope time. The Texas Petawatt at UT Austin was among the most powerful systems in that network.
Funding for large scientific infrastructure has long been subject to political and budgetary cycles. Several prominent American research facilities have faced closures or reduced operations in recent decades when federal priorities shifted, prompting ongoing debate about the best mechanisms for sustaining long-term scientific investment.
Key Perspectives
Research scientists: Investigators who relied on LaserNetUS facilities view the Texas Petawatt's closure as a significant setback, particularly for early-career researchers who built experimental programs around access to the machine. Losing a facility mid-research cycle can derail years of work.
Federal funding bodies: The Department of Energy has supported high-power laser research as a strategic priority, but broad budgetary pressures across federal science agencies have led to difficult trade-offs. Officials have not publicly detailed the specific rationale behind cuts affecting the Texas Petawatt.
Critics/Skeptics: Some observers warn that piecemeal funding approaches leave large scientific facilities chronically vulnerable to closure, arguing that the US needs a more stable, long-term funding model for research infrastructure if it intends to remain competitive with well-funded European and Asian programs.
What to Watch
- Whether the Department of Energy restores funding to the Texas Petawatt or reallocates its research mission to other LaserNetUS nodes.
- The fate of the broader LaserNetUS network amid ongoing federal budget negotiations, particularly any proposals affecting the DOE Office of Science.
- International benchmarks: progress at European facilities like ELI-NP (Romania) and Apollon (France) that may widen the gap with US capabilities if domestic investment stalls.