1. Code 6362, MSTD, Naval Research Laboratory, Washington, DC 20375, USA
2. Directed Energy Directorate, Air Force Research Laboratory, Albuquerque, New Mexico 87117, USA
3. ECE Department, University of Maryland, College Park, Maryland 20742, USA
4. Directed Energy, Optics, and Space Technology, Leidos, Billerica, Massachusetts 01821, USA