Cambridge Heavy Industries Develops Compact Desktop Fusion Reactor with Laser Technology

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Cambridge Heavy Industries is advancing fusion energy with a small, laser-driven desktop device enabling rapid experiments and tritium production, aiming to scale up for future power plants.

Fusion power traditionally involves large-scale facilities with complex machinery, but Cambridge Heavy Industries, a startup based in Cambridge, Massachusetts, is pioneering a compact fusion reactor that fits on a benchtop. This innovative approach utilizes laser technology to achieve fusion conditions with a device significantly smaller than conventional reactors.

Co-founder and CEO Yun Kai describes the reactor as a "small modular reactor" that benefits from its size by allowing rapid experimentation cycles—capable of conducting 50 to 80 fusion shots daily. This high throughput accelerates data collection, which then informs AI-driven simulations to optimize reactor design continuously.

The reactor employs a simplified inertial confinement fusion method, utilizing two main lasers. One laser is divided into concentric beam lines that sequentially compress the fuel target from the outside inward. This staged laser delivery creates a shock wave inside the fuel, culminating in a heating laser pulse that generates the conditions necessary for fusion, including a magnetic field to assist the process.

This methodology, inspired by research from MIT chemist Keith Nelson’s lab, achieves the extreme pressures required for fusion with lower overall laser power than traditional systems. The benchtop prototype serves as a nimble platform for refining the technology and conducting experiments, with plans to scale to a power plant roughly the size of two basketball courts within ten years.

Beyond power generation, Cambridge Heavy intends to use its reactors to produce tritium, a scarce hydrogen isotope essential for many fusion reactors. Given current tritium scarcity and high market price—about $30,000 per gram—the company’s reactors could supply the fusion industry while advancing reactor development. With fusion fuel cycles expected to take up to a decade to achieve full self-sufficiency, Cambridge Heavy’s tritium production could generate significant revenue.

The startup recently secured $6.2 million in seed funding led by Azolla Ventures, reflecting investor confidence in their unique approach to fusion energy. This compact, laser-driven reactor concept marks a promising step toward practical and scalable fusion power systems.