1. Laser and Optics Research Center, Department of Physics, US Air Force Academy, Colorado Springs, Colorado 80840, USA
2. Defense Advanced Research Project Agency, Arlington, Virginia 22203, USA
3. HPCMP PET/GDIT Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
4. Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB, Ohio 45433, USA