You can use the geometric line functions to make a 'laser'. Check if the obj_enemy collides with the laser-line.

The main purpose of a laser is to focus electromagnetic radiation (light) on to a single point.

LASER

Power broadening is an effect whereby the line-width of a laser is broadened by the laser intensity itself. Higher laser intensity leads to a larger line-width. This can be explained by considering the decay rate of atoms from the upper to lower laser level. As the laser intensity increases, this decay rate (which is linearly related to the line-width) increases due to stimulated emission.

Tunable lasers can be tuned in various manners. Some of these include single line and multi line tuning. Narrow band tuning is also used to tune various lasers as well.