Refractive Indices, Permittivities, and Linear Electrooptic Coefficients of Tetragonal Potassium Tantalate-Niobate Crystals

Abstract

The refractive indices no and ne, the linear electrooptic coefficient r33, and the relative (low frequency) permittivities ε3 and ε2 = ε2 of nominally pure KTN crystals with tetragonal symmetry (4 mm) are measured at different temperatures. In the case of the optical properties (no, ne, and r33) the light wavelength is varied, too.

The structure and optical properties of lead-free transparent KNLTN-La0.01 ceramics prepared by conventional sintering technique

“…The refractive index of KNLTNLa 0.01 ceramic sample is slightly smaller than the refractive indexes of tantalum niobate crystals and KTa 0.5 Nb 0.5 O 3 films on Pt/Ti/SiO 2 /Si substrates, as shown in Table 2 [16,17,20,21]. It is a little bigger than that of KTa 0.5 Nb 0.5 O 3 films on Si (001) substrates [22], which indicates the good optical properties of the KNLTN-La 0.01 ceramics.…”

“…The results do not show any significant difference in the reflectivity of the samples because the polishing processes of the ceramics were the same. However, the transparencies of the ceramics are still lower than those in the KNLTN crystals and high transparent La doped PZT ceramics prepared by hot-pressing [15,16].…”

“…The possible reason is that the wavelength approaches KTN material absorption band of near 370 nm [18]. It is well known that the frame of ABO 3 structure is BO 6 oxygen octahedron, which is closely related to the wavelength dependent refractive dispersion [16,19]. The refractive index dispersion curve of the ceramics could be described by the Cauchy model of three parameters:…”

IR spectral studies of Co0.6Zn0.4MnxFe2−xO4 ferrites

“…It depends on the ionic motions, electric structure or chemical bonding nature. The refractive indices of KTa 0:48 Nb 0:52 O 3 ; KT 0:53 Nb 0:47 O 3 ; Ba 0:773 Ca 0:227 TiO 3 and BaTiO 3 are 2.345, 2.472, 2.494 and 2.37, respectively [2][3][4][5][6][7][8][9][10][11][12][13].…”

Holographic double-exposure interferometry with tetragonal KTa1−xNbxO3: Fe crystals

“…KTa!_ x Nb x 0 3 with 0<x< 1 ) are promising photorefractive materials because of their extremely large linear electrooptic coefficients [9][10][11]. KTa!_ x Nb x 0 3 with 0<x< 1 ) are promising photorefractive materials because of their extremely large linear electrooptic coefficients [9][10][11].…”