properties of doped Pb5Ge3O11 and of (Pb1-xBax)5Ge3O11 solid solutions Proc. SPIE 3554, 205 (1998) J. Hukriede, D. Kip and E. Krätzig Thermal fixing of holographic gratings in planar LiNbO3:Ti:Fe waveguides Appl […] special mechanism in planar LiNbO3 waveguides Opt. Lett. 20, 1139 (1995) D. Kip and E. Krätzig Phase-conjugate waves generated by anisotropic four-wave mixing in LiNbO3 and LiTaO3 optical waveguides <s>Rad. […] Y. Tan, F. Chen and D. Kip Photorefractive properties of optical waveguides in Fe:LiNbO3 crystals produced by O3+ ion implantation Appl. Phys. B 94, 467 (2009) D. Kip and M. Stepic Discrete solitons in
