CfAI has a number of PhD places each year in the fields of astronomical instrumentation, adaptive optics, atmospheric turbulence monitoring, astrophotonics, biophotonics and fusion diagnostics. UK residence is required for STFC/EPSRC/NERC funded positions, but we are also always open to applicants from overseas who have their own funding.
Details of how to apply are here. Please note there are two application forms (one University and one Dept) in addition to the referee forms. You should specify Advanced Instrumentation as your field of interest.