掺铒硼硅酸钙激光玻璃光通信C波段高增益特性OA

Aiming at the bottleneck of low gain and narrow bandwidth of traditional erbium-doped laser glasses in the C-band(1 530-1 565 nm)for optical communication,we designed erbium-doped calcium borosilicate(Er∶CBS)laser glasses with Er³ ⁺ doping atom fraction ranging from 2.26%to 10.55%by adopting high-temperature melting-quenching-annealing combined method.Through characterization techniques including X-ray diffraction(XRD),Raman spectroscopy,ultraviolet/visible/near-infrared(UV/Vis/NIR)absorption spectroscopy and steady-state/transient fluorescence spectroscopy,the regulation laws of Er3+doping concentration on the glass's microstruc-ture and spectral properties were investigated.The results show that all Er∶CBS glasses maintain a stable amorphous structure.The maximum phonon energy of 2.26%Er∶CBS is 1 067 cm-1,while that of 4.44%-10.55%Er∶CBS glass is 816 cm-1,both lower than that of phosphate glass(1 200-1 350 cm-1).As the Er3+doping concentration in-creases from 2.26%to 10.55%,the emission cross-section of Er∶CBS glass near 1 535 nm increases from 4.44×10-20 cm2 to 6.32×10-20 cm2,the full width at half maximum(FWHM)of fluorescence rises from 50 nm to 70 nm,and the gain bandwidth(σₑₘ·FWHM)increases from 222×10-20 cm2·nm to 442×10-20 cm2·nm.Although the fluores-cence lifetime decreases from 1.17 ms to 0.62 ms,the figure of merit(σₑₘ·τ)remains in the range of(3.92-5.19)×10-20 cm2·ms.These findings indicate that Er∶CBS laser glasses with Er3+doping concentrations of 2.26%-10.55%is potential in the field of C-band power amplification.