High-and ultrahigh-Q whispering-gallery mode resonators have the capability to trap
photons by total internal reflection for a duration ranging from nanoseconds to milliseconds …

Whispering gallery mode (WGM) optical microresonators have attracted intense interests in
the past decades. The combination of high quality factors (Q) and small mode volumes of …

Materials with strong second-order (χ^(2)) optical nonlinearity, especially lithium niobate,
play a critical role in building optical parametric oscillators (OPOs). However, chip-scale …

We reveal a unique broadband natural quasi-phase-matching (QPM) mechanism underlying
an observation of highly efficient second-and third-order harmonic generation at multiple …

Optical whispering gallery modes (WGMs) derive their name from a famous acoustic
phenomenon of guiding a wave by a curved boundary observed nearly a century ago. This …

We report a new class of optical parametric oscillators, based on a 20-μm-long
semiconductor photonic crystal cavity and operating at telecom wavelengths. Because the …

Lithium niobate (LN) microdisk resonators on a LN-silica-LN chip were fabricated using only
conventional semiconductor fabrication processes. The quality factor of the LN resonator …

The generation of high-quality single-photon states with controllable narrow spectral
bandwidths and central frequencies is key to facilitate efficient coupling of any atomic system …

The crystal symmetry in materials such as GaAs can enable quasi-phasematching for
efficient optical frequency conversion without poling, twinning or other engineered domain …

Optical parametric oscillators (OPOs) have been widely used for decades as tunable, narrow-
linewidth, and coherent light sources for reaching long wavelengths and are attractive for …