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We observe the symmetrical dual-valley spectrum in periodically poled lithium niobate (PPLN) with a defect in the middle employing electro-optic effect. When the external electric fields are applied, light satisfying phase-matching condition (λ0) will undergo polarization rotation and then turn back. However, the polarization states of wavelength at λ0±Δλ will be changed at the end of the sample due...
High quality single lithium niobate (LiNbO3, LN) microwires and nanowires (MNWs) are synthesized by using the hydrothermal method. A propagation-distance-dependent output measurement is introduced to characterize the propagation loss in LN MNWs, and a typical loss of 0.15 dB/µm at a wavelength of 722 nm in an 830-nm-diameter LN MNW is obtained. Moreover, the advantages of wide-angle coupling and easy...
We investigate wavefront engineering of photon pairs generated through spontaneous parametric down conversion in lithium niobate-based nonlinear photonic crystals (NPCs). Due to the complexity of domain structures, it is more convenient to describe photon interaction based on the nonlinear Huygens–Fresnel principle than conventional quasiphase matching regime. Analytical expressions are obtained to...
We propose optical frequency comb generation in a monolithic micro-ring resonator. Being different from the previously reported nonlinear optical frequency combs, our scheme is based on more efficient quadratic frequency conversion rather than the third-order nonlinearity. To overcome the phase mismatch, a partly poled nonlinear ring is employed. Cascading second harmonic generation and parametric...
Electromagnetically induced transparency — Like spectrum with tunable group delay is observed in a periodically poled LiNbO3 with a central defect when an electric field is applied. A low voltage bulk phase shifter is obtained.
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