The Laser Field is comprised of dozens of low-intensity lasers which prevent Test Subjects from passing through without disabling it, otherwise resulting in death. It appears to affect living beings but not equipment, thus acting as the exact opposite of the Material Emancipation Grid.
The field's emitters are two curved emitters with a red stripe, which dispense 5 of the two-linked lasers, and on each side a bright red attention sign is marked.
The Laser Field's name is based on that of its texture files.
In Portal: Still Alive, the Laser Field was originally named as a "red wall" on the name of the signage texture found in the game's files. Like in Portal 2, its emitter was reusing the model of the Material Emancipation Grid's emitters, however its emitter was lacking the red variant skin that Portal 2 has and had used the Emancipation Grid model from Portal.