1. Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
2. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
3. Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
4. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States