Feedback control of optical beam spatial profiles using thermal lensing

摘要

A method for active control of the spatial profile of a laser beam usingadaptive thermal lensing is described. A segmented electrical heater was usedto generate thermal gradients across a transmissive optical element, resultingin a controllable thermal lens. The segmented heater also allows the generationof cylindrical lenses, and provides the capability to steer the beam in bothhorizontal and vertical planes. Using this device as an actuator, a feedbackcontrol loop was developed to stabilize the beam size and position.