Dong Xinyong

Study of energy transfer between rare earth ions in CaS host by photoluminescence spectra

When CaS:Sm3+, Eu2+ is excited at 476.5 nm (Ar+), the emission spectra taken at room temperature and at 77 K are different, indicating that there are two competitive energy transfer processes-Sm3+ --> Eu2+ and Eu2+ --> Sm3+ with phonon participation. So, the luminescence intensity of Sm3+ increases first, and then decreases as the concentration of Eu2+ is increasing

Highly Sensitive Refractive Index Sensor Based on a Cladding-Etched Thin-Core Fiber Sandwiched between Two Single-Mode Fibers

A refractive index (RI) sensor based on a cladding-etched thin-core single-mode fiber (TCSMF) sandwiched between two single-mode fibers is demonstrated. The experimental results show that the sensitivity, within the RI range of 1.333–1.340, is enhanced at least 6 times by etching. It increases with the surrounding RI and reaches 857.5 nm/RIU at RI of 1.3684, and it can be expected to be higher with the decrease of the cladding diameter of the TCSMF.

Linear Cavity Erbium-Doped Fibre Laser with Tunable Wavelength Range of 112 nm

We report on a linear cavity erbium-doped fibre laser with a large tuning range of 1509-1621?nm. We obtain a 1?dB flat tuning range of 1538-1613?nm and a 3?dB tuning range of 1516-1621?nm. The threshold at 1580?nm is 6.1?mW, the slope efficiency is 0.193 and the output power is 18.2?mW, when 100?mW pump power at 1480?nm is provided. High signal-to-noise ratios of better than 60?dB are achieved within all the tuning ranges.