Self-organized light-induced scattering in periodically poled lithium niobate

Abstract

A new species of self-organized light-induced scattering, appearing only in bulk periodically poled lithium niobate, is reported. Clearly defined diffracted beams develop on exposure to 532 nm light from a frequency-doubled, Q-switched, and mode-locked Nd:YAG laser. The structure thus created also diffracts light at 1064 nm. The effect is strongly dependent on temperature, the polarization state of the light, and the period of domain reversal. It exhibits a sharply defined nonlinear threshold at which the far-field pattern of the diffracted light evolves rapidly.

Green light generation in a periodically poled Zn-doped LiNbO3 planar waveguide fabricated by He+ implantation

“…A solution to avoid this effect is to increase the intrinsic conductivity of the material (without illumination) by doping it for example with MgO and/or to increase the temperature of the crystal [9]. Another alternative is to balance the ratio of Fe 2+ and Fe 3+ , which is particularly true for the case where the current diffusion is more important.…”

Multi-resonant forward optical parametric oscillations without external mirrors based on nonlinear photonic crystals of LiTaO3

“…This Kerr-like non-linearity should be taken into account when an intense laser beam is used, which is the case of our experiments, as described above. Besides, the index variation via the EO effect can originate from three phenomena: optical rectification (OR) [49,50], pyroelectric (PE) [51,52] and photo-induced (PI) [53][54][55] effects. The OR might contribute to the total EOs effect because under illumination of PPLT with light polarized parallel to the polar axis, it produces a quasi-static field along this axis direction.…”

Effect of domain structure fluctuations on the photorefractive response of periodically poled lithium niobate

“…[1][2][3][4] Recently it has been shown that PPLN is attractive not only for frequency doubling but also for photorefractive applications. [5][6][7] The photorefractive response of PPLN is weak for low spatial frequencies of the exciting light interference patterns and strong for sufficiently small periods of the space-charge gratings. This distinctive feature prevents large-scale distortions of light beams ͑optical damage͒ and, at the same time, permits the standard schemes of two-wave and four-wave mixing 8,9 using the advantage of strong photorefractive nonlinearity of lithium niobate.…”