Abstract
This paper presents precise measurements of the temperature dependencies of the quadratic electro-optic coefficients and in KH2PO4 crystals. In addition to traditional electro-optic coefficients describing changes in the function of an applied electric field, intrinsic coefficients, defined in terms of induced polarization, are also considered. Both intrinsic coefficients decrease with increases in temperature, but the relative temperature changes are of different orders of magnitude: 10−4 and 10−3 K−1. A Sénarmont-type setup was used for the electro-optic measurements. To achieve the best accuracy, a new approach was developed, in which, instead of using only one specific point on the modulator’s transmission characteristic, the operating point is changed during the measurements.
Highlights
Electro-optic coefficients are traditionally defined by expanding the components Bij of the relative optical dielectric impermeability tensor into a power series in the applied low-frequency electric field: System
We propose a new advanced model of the experimental setup, which takes into account the possible differences in the transmission of the fast and slow waves in the sample and the quarter-wave plate, the inaccuracy in the phase difference introduced by the quarter-wave plate, the partial interference of two waves passing through the sample, and the apparent quadratic electro-optic effect that originates from the linear effect and nonlinear transmission characteristic of the modulator
Polarimetric methods for measuring electro-optic effects are based on the change in light intensity that occurs when the light passes through a sample, placed between two linear polarizers, under the influence of an applied electric field
Summary
Electro-optic coefficients are traditionally defined by expanding the components Bij of the relative optical dielectric impermeability tensor into a power series in the applied low-frequency electric field: System. Where δij is the Kronecker delta, ni are field-free refractive indices, and rijk and gijkl are the coefficients of the linear and quadratic electro-optic effects, respectively. The changes in the rijk coefficients are much smaller if we describe the impermeability tensor as a function of the induced polarization, rather than as a function of the applied field [1,2,3]. Following the approach suggested by Pockels for the linear electro-optic effect [1,2], the intrinsic quadratic electro-optic coefficients fijk , defined in terms of polarization, can be introduced as gijkl f ijkl = 2
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
