Effect of pump parameters on the emission of PbSe quantum dot-doped optical fiber considering Auger recombination
Effect of pump parameters on the emission of PbSe quantum dot-doped optical fiber considering Auger recombination
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DOI：
10.1117/1.jnp.12.026010
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发表时间：
2018-05
影响因子：
1.5
通讯作者：
Lei Zhang;Mingye Sun;Congxiao Li;Y. Zheng
中科院分区：
文献类型：
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作者：
Lei Zhang;Mingye Sun;Congxiao Li;Y. Zheng
摘要。量子点作为光放大介质（如掺杂量子点的光纤）的缺点是基于多激子态的非辐射俄歇复合，这与泵浦功率、泵浦频率和泵浦波长有关。因此，在现有的三能级系统中引入了俄格复合寿命，进一步模拟了掺杂PbSe qd光纤的发射随上述泵浦参数的变化，以最大限度地提高发射强度和光增益。发射强度随泵浦功率的增大先增大后达到饱和，与实验结果吻合较好。观测到最优泵浦功率使发射强度最大化，这与非俄歇衰减结果不同，即发射强度随泵浦功率线性增加。发射强度随泵浦频率的增加而增加（从4 × 104 Hz增加到10 × 104 Hz）。此外，与其他更长的波长相比，532nm泵浦光的输出强度得到了增强。排放强度与泵浦流量之间的关系与实验数据相似。最大光增益为11.5 dB。阈值泵浦功率随着泵浦频率的增加而减小，此时需要更大的泵浦功率才能达到光增益饱和。本研究可为量子点掺杂光纤放大器和激光器的研究提供理论基础。
Abstract. The deficiency for quantum dots (QDs) used as optical amplified medium (such as QD-doped fibers) is nonradiative Auger recombination based on multiple exciton state, which is related to pump power, pump frequency, and pump wavelength. Thus, the Auger recombination lifetime was introduced in the existing three-level system, further the emission of PbSe QD-doped optical fiber as a function of pump parameters mentioned above was simulated in order to maximize emission intensity and optical gain. The emission intensity increased first and then saturated with the pump power, showing good agreement with the experimental data. An optimal pump power maximizing the emission intensity was observed, which is distinguished from the non-Auger decay-result that the emission intensity increased with the pump power in a linear way. The emission intensity increased with the increasing pump frequency (from 4 to 10 × 104 Hz). In addition, 532-nm pump light was confirmed to enhance the output intensity compared to the other longer wavelengths. The relationship between emission intensity and pump fluence is similar to that of the experimental data. The maximal optical gain of 11.5 dB was obtained. The threshold pump power decreased with the increasing pump frequency, in which situation, larger pump power was needed to achieve the optical gain saturation. This research might be a theoretical basis for QD-doped optical fiber amplifiers and lasers.