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Tm3+/Ho3+共掺硫系玻璃光纤放大器增益特性
作者:魏淑林 许银生 周亚训 张培晴 陈飞飞 戴世勋 
单位: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 
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
出版年,卷(期):页码:2013,41(7):1009-1014
DOI:
摘要:

中红外2.0~3.5 μm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800 nm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2 μm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2 μm波段的增益值达27 dB,增益带宽为112 nm,最佳掺杂光纤长度L = 300 cm,所需泵浦功率Pp = 200 mW,可用于2 μm波段宽带放大。
 

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The mid-infrared (2–3.5 μm) emission has potential applications in medical surgery, atmosphere pollution monitoring and military. The Tm3+/Ho3+ ions doped Ge20Ga5Sb10S65 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 lifetime 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 μm gain properties of Tm3+/Ho3+ co-doped chalcogenide glass fiber amplifier were simulated and analyzed by the proposed and the light propagation equations. 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.
 

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基金项目:
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。
作者简介:
第一作者:魏淑林(1986—),女,硕士研究生。 通信作者:许银生(1984—),男,博士,讲师。
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