1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
2. Laser Research Center, Vilnius University, Sauletekio avenue 10, Vilnius LT-10223, Lithuania
3. Institute of Photonics and Nanotechnology, Vilnius University, Sauletekio avenue 3, Vilnius LT-10257, Lithuania