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.
@article{arxiv.1103.4426,
title = {Picoradian deflection measurement with an interferometric quasi-autocollimator using weak value amplification},
author = {Matthew D. Turner and Charles A. Hagedorn and Stephan Schlamminger and Jens H. Gundlach},
journal= {arXiv preprint arXiv:1103.4426},
year = {2011}
}