TY - JOUR AU - John Hall AU - Jun Ye AU - L Ma C2 - Physical Review A (Atomic, Molecular and Optical Physics) DA - 2000-01-01 LA - en M1 - 62 PB - Physical Review A (Atomic, Molecular and Optical Physics) PY - 2000 TI - Measurement of mirror birefringence at the sub-ppm level: Proposed application to a test of QED ER -