Geoff P. Andersen U.S. Air Force Academy (United States) Luis C. Dussan Northrop Grumman Electronic Systems (United States) Fassil Ghebremichael Air Force Research Lab. (United States) Kenny Chen Lockheed Martin Missiles and Fire Control (United States)
We have constructed a new type of modal wavefront sensor that uses a multiplexed hologram and position-sensing detectors to measure the amplitudes of a preselected set of eight Zernike modes in an input beam. The measurement is all optical, with the calculations made in encoding the holograms themselves. The result is a sensor with no computational overhead or postprocessing that has the potential to operate at megahertz speeds without the need for computer calculations. We have built and tested a prototype device, demonstrating its operation both as a stand-alone wavefront sensor and in a closed-loop adaptive optics control system.