Integrated silicon photonics has sparked a significant ramp-up of investment in both
academia and industry as a scalable, power-efficient, and eco-friendly solution. At the heart …

Lithium niobate (LN) thin film has received much attention as an integrated photonic
platform, due to its rich and great photoelectric characteristics, based on which various …

Photonic integrated circuits are widely used in applications such as telecommunications and
data-centre interconnects,,,–. However, in optical systems such as microwave synthesizers …

Lasers with hertz linewidths at time scales of seconds are critical for metrology, timekeeping,
and manipulation of quantum systems. Such frequency stability relies on bulk-optic lasers …

The stabilization and manipulation of laser frequency by means of an external cavity are
nearly ubiquitously used in fundamental research and laser applications. While most of the …

Second-harmonic generation allows for coherently bridging distant regions of the optical
spectrum, with applications ranging from laser technology to self-referencing of frequency …

Photonic technologies offer numerous functionalities that can be used to realize
astrophotonic instruments. The most spectacular example to date is the ESO Gravity …

Low-loss photonic integrated circuits (PICs) are the key elements in future quantum
technologies, nonlinear photonics and neural networks. The low-loss photonic circuits …

The generation of ultra-low-noise microwave and mmWave in miniaturized, chip-based
platforms can transform communication, radar and sensing systems,–. Optical frequency …

Normal group velocity dispersion (GVD) microcombs offer high comb line power and high
pumping efficiency compared to bright pulse microcombs. The recent demonstration of …