Frequency and wavelength dependencies of the electro-optic coefficients in SBN:60 single crystal

Abstract

International audienceWe report the dependence of the high and low frequency values of the linear electro-optic (EO) coefficient rc = r33 −(no/ne)3r13 of Sr0.6Ba0.4Nb2O6 (SBN:60) single crystal on the laser wavelength. The EO response has been carried out from dc to 150 MHz for four wavelengths ranging from 465 to 1321 nm. The clamped rS and unclamped rT coefficients have been determined and their dispersions as a function of wavelength have been established and discussed

Simultaneous characterization of the electro-optic, converse-piezoelectric, and electroabsorptive effects in epitaxial (Sr,Ba)Nb2O6 thin films

“…These percentages are close to those experimentally demonstrated in SBN crystals. 39 At high frequencies above piezoelectric resonance which are used in information optical processing, the CPE effect is clamped and cannot counteract the EO performance by inducing phase shift compensation as in the above measurements. Moreover the dielectric permittivity 3 involved in drive power P should be reduced ͑it is reduced by 39% in SBN crystals 39 ͒.…”

“…39 At high frequencies above piezoelectric resonance which are used in information optical processing, the CPE effect is clamped and cannot counteract the EO performance by inducing phase shift compensation as in the above measurements. Moreover the dielectric permittivity 3 involved in drive power P should be reduced ͑it is reduced by 39% in SBN crystals 39 ͒. On the other hand the elasto-optic part should be subtracted from the above values of EO coefficients ͑this elasto-optic part represents about 25% in SBN crystals 39 ͒.…”

“…Concerning SBN crystals, very few reports exist in the literature on the separate measurements of r 13 and r 33 in SBN crystals. 31,32,39,[42][43][44] Most of the papers dealing with EO properties of SBN crystals use an assumed value for the ratio r 33 / r 13 . At = 633 nm and for a composition SBN:60, EO coefficients have been determined separately in one paper 31 which reports: r 13 =37 pm/ V and r 33 = 237 pm/ V from measurements that do not enable specifying signs.…”

“…Moreover the dielectric permittivity 3 involved in drive power P should be reduced ͑it is reduced by 39% in SBN crystals 39 ͒. On the other hand the elasto-optic part should be subtracted from the above values of EO coefficients ͑this elasto-optic part represents about 25% in SBN crystals 39 ͒. If the reduction percentages reported for SBN crystals are valid for SBN thin films, values of V L and P expected for SBN thin films at low frequencies, according to Eqs.…”