Photorefractive BilzTi020 single crystals of high optical quality were grown in a resistive heating furnace from high temperature nonstoichiometric (10: 1) solutions of BizO, and TiO, at pulling rates 0.3-0.8 mm/h at rotation 20-30 rpm along the (001) and (011) Fanning effect in the "fiber-like" BTO sample was studied and double phase conjugation with conversion efficiency up to 8% was observed in a wide range of incidence angles of the pump at A = 0.633 pm for 2 x 3 mW input light power.
Cuf-OCN-coupled pairs are observed through a systematic correlation study of different KCl + 1 at% CuC1, KCI + 1 at% KOCN, and KCl + 1 at% KOCN + 1 at% CuCl single crystals.The optical absorption measurements show that the forbidden 3d" + 3d94s transition Cu+ is completely split when disturbed by an OCN-molecule. As a result new Cu+ absorption bands besides the 260 nm partially allowed transition are observed at 218, 228, 242, and 251 nm. These new bands are attributed to interaction with OCN-. The thermally stimulated depolarization current (TSDS) is best fitted when the OCN-perturbed Cu' is considered to be a double relaxation type system rather than a single one. This is very well borne out for the two last single crystals samples. Also the presence of an unwanted isotopic impurity 180'2C14N-IS ' discussed in the doped samples. Furthermore through a thermal process it is shown that there is effectively a coupling between Cu+ and OCN-.On reporte dans cette etude, le couplage entre Cu+-OCN-atravers une etude systematique des differents cristaux KCl + 1 at% CuCl, KCl + 1 at% KOCN et KC1 + 1 at% KOCN + lat% CuCl.Les mesures optiques montrent que la transition 3d" + 3d94s de Cu+ est divisee par l'introduction de la molecule OCN-. Ainsi, des neuvelles bandes auprks de 260 nm partiellement permis, sont observCs a 218,228,242 et 251 nm. Ces nouvelles bandes sont attributes a l'interaction avec OCN-. La methode de courant de depolarisation thermiquement stirnulee (TSDC) donne des bonnes resultats quand on tien-compte des deux relaxations et ceci a tte verifik sur les deux derniers cristaux. Autrement, on discute la presence dimpurete (1*012C14N-) dans ces tchantillons. En outre, on a verifiC par la processus thermique, le couplage entre Cu+ et OCN-.
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