Tm^(3+)/Ho^(3+)共掺硫系玻璃光纤放大器增益特性  

Gain Characteristics of Tm^(3+)/Ho^(3+)-Co-doped Chalcogenide Glass Fibers

作　　者：魏淑林[1,2] 许银生[1,3] 周亚训[1,2] 张培晴[1,2] 陈飞飞[1,2] 戴世勋[1,2] 

机构地区：[1]宁波大学红外材料及器件实验室,浙江宁波315211 [2]宁波大学信息科学与工程学院,浙江宁波315211 [3]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《硅酸盐学报》2013年第7期1009-1014,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(61177087;61205181);教育部新世纪优秀人才项目(NCET-10-0976);浙江省杰出青年基金项目(R1101263);浙江省自然科学基金项目(LQ12E02003);宁波大学王宽诚幸福基金资助课题

摘　　要：中红外2.0～3.5μm波段激光在医疗、空气污染监测和军事等领域有着重要的应用前景。采用真空熔融淬冷法制备了Tm3+/Ho3+共掺的Ge20Ga5Sb10S65硫系玻璃,测试了样品的吸收光谱以及800nm激光泵浦下的荧光光谱,通过Judd–Ofelt和Mc-Cumber理论计算了Tm3+/Ho3+的辐射寿命、自发辐射几率和受激发射截面等光谱参数。在此基础上,研究了双掺离子之间的能量传递和Tm3+–Ho3+的多种跃迁过程,给出了详细的4能级系统的速率方程,并结合光功率传输方程,得出Tm3+/Ho3+共掺硫系玻璃光纤放大器在2μm波段的增益特性。数值模拟结果表明:Tm3+/Ho3+共掺硫系玻璃光纤在2μm波段的增益值达27dB,增益带宽为112nm,最佳掺杂光纤长度L=300cm,所需泵浦功率Pp=200 mW,可用于2μm波段宽带放大。The mid-infrared （2-3.5 μm） emission has potential applications in medical surgery, atmosphere pollution monitoring and military. The Tm3＋/Ho3＋ ions doped Ge20GasSb10S65 chalcogenide glasses were prepared by a vacuumed melt-quenching method. Their refraction index, absorption spectra and emission spectra were measured. The spontaneous emission probability, radiative life- time and emission cross-section were calculated based on the Judd-Ofelt and the Mc-Cumber theories. On the basis of the energy transfer and various transitions between Tm3＋ and Ho3＋ ions, a four-level rate equation was proposed. The 2 tan gain properties of Tm3＋/Ho3＋ co-doped chalcogenide glass fiber amplifier were simulated and analyzed by the proposed and the light propagation equa- tions. The amplifier feasibility exhibits a high gain and a wide bandwidth. The simulated results show that the maximum signal gain is 27 dB, and the gain width is 122 nm.

关 键 词：中红外发光 硫系玻璃 速率—传输方程 增益特性 

分 类 号：TQ171[化学工程—玻璃工业]