Spectroscopic properties of Dy-doped sesqui-sulfide powder Lu2S3 were examined. The highest-energy Raman peak is observed at 312 cm−1. Excitation and fluorescence spectra up to 4.5 µm indicate its relevance for mid-infrared laser applications.
We report on the first demonstration of continuous-wave laser operation near 2.05-µm wavelength from an in-band pumped fs-laser written waveguide in Ho3+:CaAlGdO4 crystal, resulting in an output power of 523 mW with a slope efficiency of 23.3%.
We experimentally demonstrate a new method for efficient frequency conversion of long- coherence single photons, using Bragg scattering four wave mixing. The proposed architecture overcomes the pump power limitations imposed by Brillouin scattering in optical fibers, while preserving initial photon coherence.
We propose a configuration-controlled optical encryption framework using multimode fibers (MMF), where distinct fiber configurations encode images into complex speckle patterns. A reconfigurable diffractive neural network (Re-DNN) selectively decrypts multiple datasets through configuration-dependent operations without retraining.
We demonstrate a (5+1)×1 combiner with a 9/80 µm signal fiber exhibiting >90% signal transmission over a wide range of taper ratios. To mitigate severe pump leakage observed in pure-silica capillaries, we use a 0.3 wt% fluorine-doped silica capillary.
