Radiation testing of liquid crystal optical phase shifters for space survivability

Liquid crystal-based Optical Phased Arrays (OPAs) are a disruptive technology for a variety of electronic beam manipulation functions, including steering and control of polarization, amplitude, and phase. For applications in the emerging field of space-based laser communications, such devices must be operable in an extreme environment for an extended period of time, ranging from one year to over 15 years. Preliminary space qualification of OPA components has been completed, including exposure to each of three radiation types: prompt dose, total dose, and fast neutrons. Simplified OPA surrogates (phase shifters) were used in a series of experiments here described. These radiation levels and characterization tests extend beyond historical tests and present the first results for each of fast neutron interactions and prompt dose interactions with liquid crystal devices.