The laser illumination is typically in the form of an infrared beam, which is invisible to the human eye but can be detected by the camera's image sensor. It can be used for a PTZ camera to provide additional lighting in low-light or no-light conditions, allowing the camera to capture clearer images or video at night.  

Compared with IR LED illumination which is commonly used in CCTV surveillance, laser illumination can cover a range of hundreds of meters even up to several kilometers, and it is typically used for long-range surveillance applications, such as border monitoring, perimeter security, or critical infrastructure protection. 

As laser illumination emits a narrow and highly focused beam of light, Lasers are equipped with a zoom lens to match the magnification of the camera so that the camera can capture the largest possible night vision range under different magnifications.