Laser gate

Laser gates, also known as electron walls, were designed to protect high-security or dangerous areas by sealing them off with a wall of energy.

Laser gates were installed in the Plasma Refinery Complex on Naboo. The barriers were strong enough to easily block a lightsaber strike and would vaporize any matter that touched them. However, the generators were unable to keep up the immense energy needed to power the gates, and so they would cycle on and off approximately every five minutes. Each gate remained open for only around ten seconds before cycling on again.

These gates were crucial to the death of Jedi Master Qui-Gon Jinn at the hands of Darth Maul, as they prevented Jinn's Padawan, Obi-Wan Kenobi, from coming to his aid against the Sith Lord.

Text and facts from the “Laser gate/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.