While in the camera view, there are two lasers available, Tactical Laser and Laser Designator.
The Tactical Laser (Numpad Period) is used for communicating locations directly to ground forces by projecting a visible green laser onto the target of interest. The beam is very visible during the day but harder to see at night unless using NV goggles.
The Laser Designator (Numpad Enter) is a separate laser system which uses a near-invisible red laser coded to many western laser-guided munitions. When activated, this laser can be targeted by western aircraft.