The Aqueous-phase Epitaxial Growth Representative Oxysalt Of Ⅴ Group And The Spectra Properties Analyse

The oxysalts of V A and V B group elements are two important types ofnonlinear optical crystals, in which KDP and ADP, LiNbO₃and LiNbO₃aretypical representatives of these two types of crystals. Respectively, the bulkmaterials posses excellent optical and spectral characteristics, and more spectralproperties of epitaxial materials and their doped materials may be obtained dueto the special micro-and nano-structures. As these four crystals are suitable forthe crystallization characteristics of the water phase epitaxy growth, we carriedout the theoretical and technological research on the supersaturated solutiongrowth of KDP/ADP crystal hetero-structure and its epitaxial layer with xylenolorange doping, as well as the hydrothermal growth of rare earth ions Er³⁺/Yb³⁺-doped LiNbO₃and LiTaO₃crystals with homogeneity doped epitaxial layers. Inaddition, the spectral properties of these materials were discussed intensively.The crystal growth rules of mixture crystals KADP （potassium dihydrogenphosphate （KDP） and ammonium dihydrogen phosphate （ADP）） have beenanalyzed based on the solubility product principle. The morphology of crystalinterface is analyzed by means of optical microscopes. The results reveal that themicro-growth texture on the crystal surface shows self-similar behavior with itsmacro-geometry on the corresponding crystal planes. The crystallization phaseand chemical composition of the samples are analyzed by X-ray diffraction andthermo-gravimetric. It is shown that self-similar with the micro-growth textureof the crystal surface and the corresponding crystal face reflected in macro-geometry; sample phase analysis by X-ray diffraction pattern, and the chemicalcomposition analysis by thermo-gravimetric, The results showed that productphase of KDP/ADP mixture system crystallization is tetragonal phase, and thecomposition changes with the crystallization process; Spectra attribution forpeaks of infrared absorption and Raman frequency shift on the KDP/ADPcrystal systems, is obtained based space group theory. These results will serve asthe basis of hetero-epitaxial growth in KDP/ADP crystal system by saturatedsolution crystallization method and its spectral characteristics.The heteroepitaxial layers have been obtained by immersing KDP （ADP）substrate into the ADP （KDP） saturated solut. The micromorphology indicates that small growing points on different planes show the self-similar propertycompared to the morphology of bulk crystal. The process of epitaxial growthdepends on not the lattice match but the crystallizing kinetics, which is the maininfluencing factor. Moreover, it can be inferred from the micromorphology onthe surface of the mixed crystal that the dissolving of substrates will form mixedsolution on the epitaxial surface. What’s more, corrosion phenomenon becomesmore and more evident with increasing time of epitaxial growth and it will behard to form transparent epitaxial layers due to increasing tension of epitaxiallayers.It is interesting that during the process of testing, different Raman peakscould be observed via different apparatuses. Raman peaks through LabRAMHR800are consistent with the previous references. However, the resultsobtained with Renishaw2000micro-Raman spectroscopy show large deviationswith the previous references. One reason for this difference is the evidentpolarization effect under high energy and power density. Another probablereason is the special microstructures which formed during the growth would leadto special micro-nano optical effects.The phenomenon of dye coloring anisotropy has been discovered in crystalgrowth process of potassium dihydrogen phosphate （KDP） and potassiumdihydrogen phosphate （ADP） doped with xylenol orange dye, and the obviousboundary could be seen in colored region. The absorption spectra of the XO-KDP and XO-ADP are measured and analyzed. The results show that theabsorption of the XO-ADP in the red band is much larger than that of the XO-KDP which is due to the role of NH4+and XO anions. X-ray diffraction analysisresults show that XO doping is beneficial to the ADP/XO KDP growth becauseof the lattice match, but not to KDP/XO-ADP epitaxial growth. The micro-Raman spectroscopy analysis of interface of ADP/XO-KDP and KDP/XO-ADPepitaxial growth results showed that:（1） The XO fluorescence can raise thebackground of samples phonon response;（2） XO will affect the phonon widespectra of Raman frequency shift, because of the change of the lattice constantmatching. The higher the lattice constant matching is, the weaker of phononspectrum of the Raman frequency shift is.（3） In particular, in terms of KDP/XO-ADP, the strong interaction between the XO anions and NH4+ions makes thestructure of [NH4] groups more stable in the intensity power. The properties of hydrothermal method homo-epitaxial ion source motherliquor and the extension reaction process of the hydrothermal method wereanalyzed. On this basis, the growth of rare earth Er³⁺/Yb³⁺-doped epitaxial layeron the LiNbO₃and LiTaO₃crystalline substrates was achieved. The morphologyand elemental analysis showed that concentration of metal ions and F-ion in themother liquor should not be too high, and the pH value should be controlledbetween3⁴. The absorption spectra of the samples were measured, and theundetermined parameter kNLwhich is related to the concentration and thicknessis intruced the research of fitting calculation is conducted on the bases ofabsorption spectrum about the hydrothermal epitaxial polycrystalline sample onthe surface of LiNbO₃and LiTaO₃doped with Er³⁺/Yb³⁺single crystallinesubstrate according to J-O theory at the room temperature. This method can beextended to the system without direct access to the data of concentration andthickness such as powder or colloid. According to the rate equation and theconsequence calculated via spectrum parameters, this paper confirms that boththe Er³⁺/Yb³⁺doping ratio and excitation light power are able to influence thered-green up-conversion luminescence spectrum; the method of reducing theenergy of matrix phonon shall be tried to improve the quantum cutting yield of⁴I_13/2to²H_11/2and⁴S_3/2.