[1] Palacky Univ, Joint Lab Opt, 17 Listopadu 50a, Olomouc 77207, Czech Republic
[2] Acad Sci Czech Republic, Inst Phys, Olomouc 77207, Czech Republic
[3] Palacky Univ, Fac Sci, Olomouc 77146, Czech Republic
[4] Palacky Univ, Reg Ctr Adv Technol & Mat, Olomouc 77207, Czech Republic
[5] Friedrich Alexander Univ Erlangen Nuremberg, Dept Mat Sci Glass & Ceram 3, D-91058 Erlangen, Germany
[6] Univ Erlangen Nurnberg, Inst Opt, D-91508 Erlangen, Germany