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This paper presents a study of the control problem of a laser beam illuminating and focusing a microobject subjected to dynamic disturbances using light intensity for feedback only. The main idea is to guide and track the beam with a hybrid micro/nanomanipulator which is driven by a control signal generated by processing the beam intensity sensed by a four-quadrant photodiode sensitive detector (PSD). Since the pointing location of the beam depends on real-time control issues related todoi:10.1080/15599612.2014.890813 fatcat:p6nsq5wz75f5bgn6adgtoxgrju