YB Chen's research while affiliated with Nanjing University and other places

... Our present scheme does not require a resonant cavity, and the single-pass cascaded nonlinear process has already been achieved in experiments [27], which is different from the previous works such as in refs. [15,20,21,28], which investigated the generation of quantum steering by cascaded nonlinear processes in an optical cavity. ...

... In its present tunable version, the ring laser is capable to address narrow atomic resonances and hence is a challenging and cost-effective all solid-state narrow linewidth coherent source for high-resolution spectroscopy, when compared to dye lasers. With further drastic reduction of the passive intracavity loss (mainly due to the etalon and the AR-coating of the BiBO) and by using either NCPM birefringent nonlinear crystals or temperature-tuned quasi-phase-matched nonlinear crystals possessing a higher nonlinearity (such as ppKTP [1] or ppLiTaO [19]), SLM red power scaling to the Watt-level range should be achievable with an optimally-coupled ICSHG ring setup and should ease wavelength tuning across the full gain bandwidth without any cavity realignment during the tuning process. The narrowness of the spectral quasi-phase-matching bandwidths associated to such periodically-poled SH converters (leading to a ratio and to unstable SLM operation for sufficiently long samples) can be counterbalanced with the use of a suitable intracavity etalon [1]. ...

... However, the researches and discussions on PT -symmetric ordered-aperiodic network systems are quite rare. As a typical and interesting representative of ordered-aperiodic structures, the Fibonacci binary sequence [31] is often seen in normal dielectric photonics designs [32][33][34][35][36][37], but few related works can be found in the PT symmetry community. The knowledge and understandings of ordered-aperiodic and disordered PT -symmetric systems are crucial to fully understand and master the behaviors and properties of the fascinating PT -symmetric optical materials and are beneficial to future integrated light circuit network designs. ...