A study is made of the proton exchanged waveguiding layers in lithium tantalate crystals. Examined are the regularities of physical chemical processes occurring in lithium tantalate of different orientation during the proton exchange. They are compared with similar regularities for lithium niobate. It is shown that proton exchange is accompanied by accumulation of crystal lattice deformations. Also studied are the optical properties of the waveguides.
Magnetic and magnetooptical properties of the Cr doped GaN layers have been investigated in the temperature range 50-400 K. A high saturation magnetization of 25 G has been observed in the obtained material. Spectra of the magnetooptical transversal Kerr effect have revealed strong magnetic response in the energy range less than 3.0 eV due to the appearance of new spin polarization states in the band gap of GaN upon Cr doping.
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