1. Laser Technologies Group, Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
2. Laser Thermal Laboratory, Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720-1740, USA
3. Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720-1740, USA
4. Sandia National Laboratories, PO Box 5800, Mail Stop 0791, Albuquerque, New Mexico 87185-0791, USA