UV laser-induced poling-inhibition produces inverted domains in LiNbO3 which overlap significantly with waveguide modes. We have observed a 26% enhancement of the effective electro-optic coefficient in such domain-engineered waveguides. OCIS codes: (130.3730) Lithium niobate; (130.0130) Integrated optics; (230.0230) Optical devices

High speed directional etching of non conventional materials like Quartz, Lithium Niobate and Lead Titanate is still insufficiently developed for producing high aspect ratio microstructures. Compared to deep silicon etching, the plasma etching of these materials has suffered from limitations in achievable depth, aspect ratio, verticality and smoothness of surfaces. Deep etching with nearly vert...

We describe the experimental measurement of phase-conjugate reflectivity versus various ratios of input-beam intensities in photorefractive barium titanate and strontium barium niobate crystals. The experimental results are compared with the theoretical prediction from the coupled-wave theory. Three different methods to measure the nonlinear coupling constant of the crystal are also presented a...

Light propagation in periodically poled lithium niobate (PPLN) waveguide arrays is numerically investigated. By employing the concept of a linear focusing effect, we propose a brand new method to control discrete diffraction and spatial solitons in PPLN waveguide arrays by electrical field. Simulated results are presented, and the principle is discussed to demonstrate the feasibility of the met...

Coherent modulation formats have gained considerable importance in high-capacity, high-efficiency optical systems. A key component for achieving good transmission performances are Lithium niobate modulators, which can be designed and optimized to operate with BPSK, QPSK, 16-QAM and OFDM modulation schemes providing excellent results. Keywords-LiNbO3; coherent systems; modulators.

We study theoretically and experimentally the modulational instability of broad optical beams in photorefractive nonlinear media. The angular dependence of the growth rate of periodic perturbations is calculated. Our findings are confirmed by experimental measurements on a strontium barium niobate photorefractive crystal.

Lithium niobate-on-insulator (LNOI) is an emerging photonic platform that exhibits favorable material properties (such as low optical loss, strong nonlinearities, and stability) enables large-scale integration with stronger confinement, showing promise for future networks, quantum processors, nonlinear systems. However, while photonics engineering has entered the era of automated “inverse desig...