The Exploration Of Optical Properties And Amplification Mechanism Of PYN Electrooptic Ceramics

From the birthday on, ferroelectric ceramics have been regarded as the corematerials for many industry application. Special one of that—lead lanthanumzirconate titanate ceramics （PLZT） point a new developing direction for lots ofdevices. Compared with previous ceramics, PLZT owns many advantages such ashigher optical transmittance, wide range of transmission wavelength and moresensitive to electric field. In particular, electro-optical properties are in connectionwith ferroelectric for PLZT. We could influence the domain orientation by externalelectric field to control birefringence, light scattering and so on. PLZT has been asubstitute for crystal material and get into application realm gradually. As a hostmaterial for gain media, PLZT has been widely researched and demonstratedconsiderable gain coefficient.On the other hand, high-power output rare-earth near-infrared lasers′development have been stimulating the search for longer level lifetime of activeions. Yb³⁺has been regarded as a perfect candidate because of that. So gain mediacontaining Yb³⁺is a focus for research. In this paper, we adopted a newsolid-solution ceramics which based on PLZT—La³⁺doped15%PYN-36.25%PZ-48.75PT （PYN）. This material contains lager number of merits of PLZT. Becauseof drawing great attentions for Yb³⁺gain media, we hope to utilize a new type ofceramics to get amplification. The main work of the paper is to measure PYN gainability.At first, we measured hysteresis loops for PYN, and revealed a way to controlthe type of electro-optical effects by choose the proportion between PZ and PT.Then we surveyed transmittance range for PYN and track-recorded the relativedielectric constant as a function of temperature from20oC¹40oC, then we devisedoptical path, taking advantage of single-beam method, to get the quadratic electro-optical coefficient for532nm,561nm,632.8nm,1064nm, respectively.Before investigation of PYN amplification, we measured XRD, absorption andemission spectrum to determine pump and seed light′wavelength. We calculatedspontaneous emission factor, absorption and emission cross-section. Theoreticallydemonstrated the possibility of amplification.The last of all, we researched the dependence of gain coefficient on seedintensity, pump intensity, seed wavelength and pump wavelength. CalculatedEinstein coefficient and so on.