1. Department of Materials Science and Engineering, University of Michigan 1 , Ann Arbor, Michigan 48109
2. Department of Electrical Engineering and Computer Science, University of Michigan 2 , Ann Arbor, Michigan 48109
3. Optical Single Crystals Group, National Institute for Materials Science 3 , Tsukuba 3050044, Japan
4. Applied Physics Program, University of Michigan 4 , Ann Arbor, Michigan 48109