Adaptive control of jitter in a laser beam pointing system

This paper presents an adaptive control scheme for suppressing jitter in laser beams. The variable-order adaptive controller is based on an adaptive lattice filter that implicitly identifies the disturbance statistics from real-time sensor data. The multi-channel adaptive control structure is exploited to allow both feedback of the beam position error and feedforward of an accelerometer measurement. In the experiments presented here, the high-order adaptive controller controlled jitter over a broad spectrum of frequencies, almost up to the Nyquist frequency.