We demonstrate electrically pumped, heterogeneously integrated lasers on thin-film lithium niobate, featuring electro-optic wavelength tunability.

Elastic strain, electrical bias, and localized geometric deformations were applied to elliptical whispering-gallery-mode resonators fabricated with lithium niobate. The resultant perturbation of the mode spectrum is highly dependant on the modal indices, resulting in a discretely reconfigurable optical spectrum. Breaking of the spatial degeneracy of the whispering-gallery modes due to perturbat...

We demonstrated a 670 mW continuous-wave single-frequency laser source at 780 nm by using external-cavity-enhanced second-harmonic generation of a seeded fiber amplifier in periodically poled lithium niobate. A maximum second-harmonic conversion efficiency of 58% was achieved. The source can work stably over 1 h by locking the frequency-doubling cavity, while the power stability is less than 2%.

We report on intensity-dependent switching in lithium niobate directional couplers. Large nonlinear phase shifts that are due to cascading detune the coupling between the coupler branches, which makes all-optical switching possible. Depending on the input intensity, the output could be switched between the cross and the bar coupler branches with a switching ratio of 1:5 and a throughput of 80%.

We consider the interaction of surface acoustic waves (SAWs) with short electrode gratings encompassing only few electrodes on 128 lithium niobate (LiNbO3). The qualifications of the reflectors are evaluated by comparing the part of incident SAW energy scattered by the structure into the bulk to the energy reflected back as a SAW.

We study numerically depressed-index cladding, buried, micro-structured optical waveguides that can be formed in a lithium niobate crystal by femtosecond laser writing. We demonstrate to which extent the waveguiding properties can be controlled by the waveguide geometry at the relatively moderate induced refractive index contrasts that are typical of the direct femtosecond inscription.

The potential of a χ photonics, implemented in periodically poled Lithium Niobate (PPLN) waveguides with an engineerable quadratic nonlinearity, for ultrafast all-optical signal routing and switching will be evaluated. High bit rate signal regeneration and routing, based on spatial soliton formation in film waveguides, as well as transparent switching, based on parametric amplification in waveg...

The results of detailed experimental and theoretical considerations relating to multiple hologram recording in lithium niobate is reported. The following problem areas are identified and discussed: 1) the angular selectivity of the stored holograms, 2) interference effects due to the crystal surfaces, 3) beam divergence effects, 4) material recording sensitivity, and 5) scattered light from mat...

We report what we believe is the first observation of modulation instability in the anomalous-diffraction regions of a photonic lattice. The experiments were carried out in a 1D waveguide array fabricated in a lithium niobate crystal displaying the photovoltaic self-defocusing nonlinearity, and our results are confirmed numerically by simulating the nonlinear beam propagation.

Lithium-niobate microcavities have not only the ability to resonantly enhance light–matter interaction but also excellent nonlinear optical properties, thereby providing an important platform for investigations. In this paper, we report observation of multi-peak spectra in near infrared range lithium-niobate on a chip under pump 1550 nm continuous laser. Such spectrum was attributed sum-frequen...