A laser system is disclosed comprising a laser device for emitting laser radiation and an optical fiber adapted to connect, in use, to the laser device for delivering the laser radiation. The optical fiber contains a label, such as an RF identification tag, a barcode or a color code. The laser device interrogates the optical fiber and receives information back from the optical fiber. If the usage of the optical fiber has exceeded safety limits then the laser device may be prevented from operating. The laser device on receiving information from the optical fiber may also be configured to deliver laser radiation having a specific power, pulse width, pulse interval and treatment duration.