# EPFL demonstrates chip-scale blue laser with rapid frequency control

_Published Thursday, October 29, 2026 at 8:05 PM EDT · Science · Latest · Tier 2 — Notable_

![EPFL demonstrates chip-scale blue laser with rapid frequency control — Primary](https://scx2.b-cdn.net/gfx/news/2026/a-blue-laser-for-under.jpg)

EPFL researchers demonstrated a chip-scale blue laser that combines stable emission with rapid electronic frequency control, with laboratory tests showing underwater data transmission and smoke detection. The device connects a conventional blue laser to a microscopic ring that selects a frequency and feeds light back into the laser.

Voltage-driven aluminum nitride components adjust the ring through mechanical stress. One configuration achieved a linewidth below 30 kilohertz; another tuned across more than 900 megahertz, repeating adjustments up to 1 million times per second.

The underwater test reconstructed an image transmitted through 30 centimeters of water. The smoke experiment detected airborne particles but did not measure their concentration.

## Sources

- [Phys.org](https://phys.org/news/2026-10-blue-laser-underwater-communication.html)

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Canonical: https://techandbusiness.org/newswire/KL7fYXbexL5fV9IFJuoOTW
Published: 2026-10-30T00:05:48.451Z
Story chronology: 2026-10-29T18:40:08.000Z
Retrieved: 2026-10-30T02:52:37.085Z
Publisher: Tech & Business (techandbusiness.org)