1. Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
2. LIGO Laboratory, California Institute of Technology, Pasadena, CA 91125, USA.
3. Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523, USA.
4. Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA.
5. Départment de Physique, Université de Montréal, Québec H3C 3J7, Canada.