Method and apparatus for monitoring and controlling laser intensity in a ROS scanning system

This system keeps a laser's brightness steady by using an aperture to block the outer edges of the laser beam. The light clipped by the aperture is reflected to a sensor, which measures its intensity. A feedback circuit then adjusts the laser's power to maintain a consistent brightness for a scanning system.

Why it matters: Since 2005, the cost and power of microcontrollers have dramatically improved, making precise real-time feedback control for laser intensity stabilization far more accessible and robust.

Status: ExpiredProtection ended and was never renewed
How hard to build: ModerateElectronics for feedback control loop.

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