1. Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62210, Mexico
2. Ullrich Photonics LLC, Wayne, Ohio 43466, USA
3. Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43403-0209, USA
4. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson AFB, Ohio 45433-7707, USA