Author Affiliations
Abstract
1 State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2 Department of Chemistry, City University of Hong Kong, Kowloon 999077, Hong Kong, China
3 Analytical and Testing Center, South China University of Technology, Guangzhou 510640, China
4 School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
With the rapid growth of optical communications traffic, the demand for broadband optical amplifiers continues to increase. It is necessary to develop a gain medium that covers more optical communication bands. We precipitated PbS quantum dots (QDs) and nanocrystals (NCs) in the same glass to form two independent emission centers. The NCs in the glass can provide a crystal field environment with low phonon energy for rare earth (RE) ions and prevent the energy transfer between RE ions and PbS QDs. By adjusting the heat treatment schedule, the emission of the two luminescence centers from PbS QDs and ions perfectly splices and covers the ultra-broadband near-infrared emission from 1200 nm to 2000 nm with bandwidth over 430 nm. Therefore, it is expected to be a promising broadband gain medium for fiber amplifiers.
PbS quantum dot Tm3+ nanocrystal-glass composite broadband near-infrared emission Chinese Optics Letters
2022, 20(2): 021603
浙江工业大学光电子智能化技术研究所,浙江 杭州 310023
实现了基于PbS量子点掺杂的近红外S-C-L超宽带低噪声光纤放大器(QDFA)。以紫外(UV)固化胶为光纤纤芯本底,以PbS量子点作为增益介质,由973 nm单模激光器、隔离器、波分复用器、量子点掺杂光纤等构成全光路结构,在1470~1620 nm的宽波带区间实现了对信号光的放大。结果表明:在1550 nm波长附近,QDFA的带宽为75 nm。当输入信号光功率为-23 dBm时,开关增益为16 dB~19 dB(净增益为12.26 dB~15.26 dB),噪声系数约为3 dB。实验观测到了较明显的激励阈值和增益饱和现象,确定了适用的量子点掺杂浓度与光纤长度之间的线性关系。所实现的QDFA的带宽、C波带增益平坦度、噪声系数等指标优于常规的掺铒光纤放大器(EDFAs),L波带增益平坦度略低于经优化的多光纤EDFAs。
光纤光学 放大器 PbS量子点 量子点掺杂光纤 增益带宽 最佳掺杂浓度 激励阈值 光学学报
2018, 38(10): 1006006
1 中国科学技术大学国家同步辐射实验室, 安徽 合肥 230029
2 中国科学技术大学物理学院, 安徽 合肥 230026
3 中国科学技术大学材料科学与工程系中国科学院能量转换材料重点实验室, 安徽 合肥 230026
荧光集光太阳能光伏器件在平面光波导效应的作用下实现等效聚光，可以减少太阳能电池的用量，有效降低光伏发电的成本。将胶体化学法制备的吸收和发射在近红外波段的单分散球状PbS量子点荧光材料封装于两片光伏超白玻璃间的正己烷溶液中，构成溶液夹层封装的平面光波导，并和效率为17%的单晶硅太阳能电池耦合，制作出了吸收在700~1000 nm，效率约为1.31%的近红外荧光集光太阳能光伏器件。
光学器件 光伏 荧光集光太阳能光伏器件 硫化铅量子点 近红外
