Institute of Applied Physics, Technical University Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt, Germany.
Opt Lett. 2013 Apr 15;38(8):1334-6. doi: 10.1364/OL.38.001334.
We demonstrate experimentally that the first- and second-order coherence properties of light emitted by a quantum dot superluminescent diode can be simultaneously tailored by well-controlled optical feedback. Depending on feedback intensity and feedback spectral range we achieve a spectral width Δλ between 120 and 0.26 nm, corresponding to a coherence length in first order in the range between 13 and 5820 μm, while the central second-order coherence degree g((2))(τ=0) is tuned gradually from a thermal value of g((2))(0)~1.8 down to the coherent laser limit of g((2))(0)=1.0. These results are complemented by comprehensive investigations of relative intensity noise, which are in excellent agreement with the observed intensity correlation behavior.
我们通过实验证明，通过良好控制的光反馈可以同时调整量子点超辐射二极管发射光的一阶和二阶相干特性。根据反馈强度和反馈光谱范围，我们实现了 120nm 到 0.26nm 之间的光谱宽度 Δλ，对应于一阶相干长度在 13μm 到 5820μm 之间，而中心二阶相干度 g((2))(τ=0)逐渐从热值 g((2))(0)~1.8 调至相干激光极限 g((2))(0)=1.0。这些结果通过对相对强度噪声的综合研究得到补充，其与观察到的强度相关行为非常吻合。
