Home/Technical Glossary/Real Time Laser Power Feedback Real Time Laser Power Feedback Pulsed Nd:YAG lasers may be designed to provide a number of special features to optimize the weld process and increase reliability and repeatability for more demanding applications. Real time power feedback, through pulse width modulation of the source current, ensures excellent pulse to pulse stability and automatically delivers the same pre-set weld over the full life of the flash lamp.