# Xcimer gains RTX backing for laser defense work

_Sunday, September 13, 2026 at 9:15 AM EDT · Science, Products · Latest · Tier 2 — Notable_

![Xcimer gains RTX backing for laser defense work — Primary](https://techcrunch.com/wp-content/uploads/2026/06/pacific-fusion-pulser-prototype-side.jpeg?resize=1200,800)

Laser-fusion startup Xcimer announced a partnership with and investment from RTX last week, according to TechCrunch. RTX Ventures will provide funding, while RTX can explore uses for Xcimer's high-power lasers.

Xcimer says its Phoenix laser system is the largest privately owned system of its kind, though it operates at roughly one-tenth the power the company says a fusion power plant would require. The arrangement links a fusion developer's laser technology to defense applications as fusion startups seek capital beyond climate-focused venture funding.

## Sources

- [TechCrunch](https://techcrunch.com/2026/09/13/fusion-power-startups-find-new-partners-in-the-defense-world/)

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Retrieved: 2026-09-13T20:18:07.119Z
Publisher: Tech & Business (techandbusiness.org)