Growth and characteristics of Fe-doped KTiOPO_4 crystals

摘要

Single crystrakls of Fe-doped KTiOPO_4 (Fe:KTP) of optical qualtiy and dimensions up to 15×25×30 mm were grown by the flux method. Durign the grwoth process the formaiton of twin consisting of bicrysals was observed, even in the case of single-crystallline seeds. The Fe doping level in crystals is about 0.08-0.1 wt/100. The following physical proeprties ere investigated: refractive indices, dielectric, piezoelectric, electro optical, elastic and thermoelastic constants. In order to determine whether Fe ions play a major role in photorefractive effect (PRE) of KTP, light-induced index change was measured and the results indicate that in KTP crystals Fe ions do not play a major role in PRE. It is also found that Fe:KTP shows different diffusion properties during the Rb:K ion exchange process in comprison with undoped KTP.