A paper in Light: Science & Applications uses topology-optimized dielectric nanocavities to enhance exciton emission from monolayer WSe2, offering stronger and customizable light-matter interactions for on-chip quantum optics, nonlinear optics and low-threshold lasers.
A team led by Associate Researcher Luo Jing at the Changchun Institute of Optics, Fine Mechanics and Physics published a paper in Optics and Lasers in Engineering using the low-frequency polarization aberration produced by plane mirrors in non-parallel optical paths to compensate for the polarization aberration of the optical system itself. In design verification of a typical off-axis three-mirror system, adding a plane mirror and adjusting its pose reduced the system's polarization aberration to 1/15 of its original value, with the full-field average phase retardance dropping from 0.0759 rad to 0.0050 rad, while wavefront aberration and optical efficiency were essentially unaffected.
A team at the Suzhou Institute of Nano-Tech, Chinese Academy of Sciences, has developed a theoretical model for PML-SRLs, revealing that operating states are governed by the temporal balance of gain and loss. The model combines time-domain traveling-wave equations with partial differential equations for carrier density, examining the relationship among SOA carrier accumulation rate, SA carrier lifetime and ring-cavity round-trip time. The work, published in Optics Express, also found that an SOA with a narrow gain spectrum and a short resonator configuration can merge output pulses to yield high-energy optical pulses.
Why we recommend it: Putting gain, absorber and cavity round-trip time into a unified dynamic model offers transferable design insight for understanding mode-locking states and pulse merging in semiconductor ring cavities.