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Here the authors provide the experimental demonstration of a widely tunable integrated frequency comb source unlocking the spectrum from the visible to the mid-infrared in a thin-film lithium niobate platform.

Using low-threshold and dispersion engineering, a 2.6-octave frequency comb is generated on a LiNbO₃ chip via an optical parametric oscillator with only 121 fJ. The optical parametric oscillator design eases the requirements for quality factor and relatively narrow spectral coverage of the cavity.

Optical molecular sensors benefit many applications from fundamental science to industry. In this work, the authors leverage the formation dynamics of cavity solitons to achieve molecular sensing in the mid-infrared spectral region.

By combining engineered dispersion and chirped quasi-phase matching in multisegment nanophotonic thin-film lithium niobate waveguides, the generation of gap-free frequency comb spanning from 330 to 2,400 nm can be realized with only 90 pJ of pulse energy at 1,550 nm.

Mode locking, which is a common technique to produce short laser pulses, is demonstrated in a topological laser.

Non-equilibrium and collective behaviors such as phase transitions in optical systems can lead to interesting applications in photonics. Here the authors demonstrate spectral phase transition in a ubiquitous nonlinear driven-dissipative system, the optical parametric oscillator.

The authors introduce and demonstrate cross-comb spectroscopy in the mid-infrared as a variant of dual-comb spectroscopy. It provides enhanced performance and allows mid-infrared spectral information to be obtained by near-infrared detection.

In this work, the authors show that photonic topological lattices with dissipative couplings could exhibit non-Abelian dynamics and geometric phases that are in sharp contrast to those arising in typical energy-conserving systems.

Spontaneous parametric down-conversion was used to generate narrowband photon pairs with a high spectral brightness in a high-Q silicon nitride microresonator.

Dispersive coupling between two optical parametric oscillators induces a first-order phase transition in the system at a critical detuning. This manifests as a discontinuity in the dimer’s spectrum, which may be useful for enhanced sensing.

The formation of ultra-short dissipative quadratic solitons is realized using optical parametric amplification at low pump energies and in the presence of substantial temporal walk-off between the pump and signal.

Topological phenomena have mostly been studied in conservative systems. Experiments on optical resonator networks now show that topologically non-trivial characteristics can also emerge in dissipation.

A network of four degenerate optical parametric oscillators (OPOs) is employed to find the ground state of the Ising Hamiltonian. The good performance of the network reveals the potential of OPOs for many similar problems.

Vectorial electromagnetic modes in coupled metallic nanolasers are used to emulate the behaviour of complex magnetic materials, providing an integrated nanophotonic platform to study spin exchange interactions and map large-scale optimization problems.

Researchers exploit the quadratic nonlinearity of lithium niobate nanowaveguides and demonstrate cavity-free all-optical switching. Switching energies down to 80 fJ, switching times down to ~46 fs and energy–time products of 3.7 × 10⁻²⁷ J s are shown.

We propose and experimentally demonstrate a new paradigm for parameter-efficient and robust photonic deep learning based on a Neural Cellular Automata architecture.

We experimentally demonstrate a special-purpose photonic computer as a novel hardware platform for simulating complex phenomena using cellular automata.