Holographic Adaptive Optics Geoff Andersen, US Air Force Academy Presented in this talk will be a new type of closed-loop adaptive optics system with significant advantages over existing methods. The wavefront sensor uses a multiplexed hologram and array of photodiodes to characterize the wavefront phase error in terms of actuator response functions. In essence, the hologram acts as an all-optical parallel processor which is completely computer-free and runs equally fast for one actuator as for one million. As well as being compact and extremely fast, the system is modal and is thus largely insensitive to obscuration and scintillation. We will present details of the operation of the device and experimental results from a prototype device which already operates at 10kHz. Future work aimed at much higher speeds and some unique applications will also be given.