Abstract
We study systematically the effect of spatial disorder of ferroelectric domains in nonlinear media on the polarization properties of optical frequency conversion. Experimentally, different statistics of domain sizes are created using electric field poling at room temperature. We analyze the evolution of polarization properties of the second- and third-harmonic signals for each created statistic by determining the corresponding relative strength of non-zero components of the second-order susceptibility tensor, d24, d32 and d33. The relative strengths are labeled by means of the control parameter E on the characteristic P-E loop of the studied ferroelectric medium.
Highlights
The analysis of the allowed polarization in nonlinear parametric processes is part and parcel of nonlinear optics
We study systematically the effect of spatial disorder of ferroelectric domains in nonlinear media on the polarization properties of optical frequency conversion
We analyze the evolution of polarization properties of the second- and third-harmonic signals for each created statistic by determining the corresponding relative strength of non-zero components of the second-order susceptibility tensor, d24, d32 and d33
Summary
The analysis of the allowed polarization in nonlinear parametric processes is part and parcel of nonlinear optics. Multi-dimensional disorder provides the possibility to apply different noncollinear phase-matching conditions, classified into two main categories: longitudinal ( named Cerenkov condition [6]), due to which the second-harmonic signal is emitted on a cone [3,4,7,8] and lateral (nonlinear Bragg condition [9]), for which the harmonics are emitted in a plane [4,10,11] Those broadband noncollinear phase-matching processes can be used to characterize femtosecond laser pulses [12,13,14,15]. The reported domain widths in SBN crystals range between a few nanometers and a few micrometers and the lengths are of a few hundreds of micrometers [22] Due to this broad spectrum of domain widths, the higher harmonics intensity distribution can look very different [11, 23]. It is possible to control the processes, and to restore the desired interaction strength by adjusting the corresponding spontaneous polarization
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