Difference between Raycus Lasers Souce QS, QE, QB Raycus, as a globally renowned laser brand, offers a complete range of laser applications, including laser marking, laser welding, laser rust removal and cleaning, and fiber cutting, covering various applications in the manufacturing industry. As a representative Chinese laser brand, their laser marking series is further divided into three series: QE, QS, and QB, based on practical applications and customer budgets.