Picoradian deflection measurement with an interferometric   quasi-autocollimator using weak value amplification
  We present an "interferometric quasi-autocollimator" that employs weak value amplification to measure angular deflections of a target mirror. The device has been designed to be insensitive to all translations of the target. We present a conceptual explanation of the amplification effect used by the device. An implementation of the device demonstrates sensitivities better than 10 picoradians per root hertz between 10 and 200 hertz. 
Matthew D. Turner, Charles A. Hagedorn, Stephan Schlamminger, Jens H.   Gundlach
physics.ins-det physics.optics quant-ph