YAl₃(BO₃)₄:TM (TM = Mn, Co, Cr) nanocrystals synthesis for laser operated nonlinear optics

An attempt to synthesize YAB matrices doped with cobalt, manganese, and chromium ions by means of the Pechini method for photo-induced nonlinear optics was performed. The best results were obtained for the Cr doped samples. It may be related with the fact that YAB:Cr main absorption peak is situated near the photo-inducing green second harmonics of Nd:YAG laser at 532 nm. It was established that after 600 s of samples illumination there was observed some maximum of the SHG. With the further treatment of the materials the SHG starts to decrease. The maximal enhancement was achieved at 150 K. After the switching off of the photo-inducing treatment the output SHG was relaxed to initial state during 2–3 min. Local increase of temperature due to heating did not exceed 6 K. For the Mn doped YAB NC the behavior is quite non-monotonic. The SHG changes are within the accuracy of the YAB NC NLO measurements. One can see two slight maxima at 200 and 800 s. At the same time Co suppress the output SHG, which may be caused by specific features of Co ions.