Chen Yujie, Herrnsdorf Johannes, Guilhabert Benoit, Zhang Yanfeng, Watson Ian M, Gu Erdan, Laurand Nicolas, Dawson Martin D
Institute of Photonics, SUPA, University of Strathclyde, Glasgow G4 0NW, UK.
Opt Express. 2011 Feb 14;19(4):2996-3003. doi: 10.1364/OE.19.002996.
We report random laser action in a system where optical amplification is provided by colloidal quantum dots (CQDs). This system is obtained by depositing from solution CdSe/ZnS core-shell CQDs into rough micron-scale grooves fabricated on the surface of a glass substrate. The combination of CQD random packing and of disordered structures in the glass groove enables gain and multiple scattering. Upon optical excitation, random laser action is triggered in the system above a 25-mJ/cm2 threshold. Single-shot spectra were recorded to study the emission spectral characteristics and the results show the stability of the laser mode positions and the dominance of the modes close to the material gain maximum.
我们报道了在一个由胶体量子点（CQD）提供光放大的系统中实现了随机激光作用。该系统是通过将CdSe/ZnS核壳型CQD从溶液中沉积到在玻璃基板表面制造的粗糙微米级凹槽中而获得的。CQD的随机堆积和玻璃凹槽中的无序结构相结合，实现了增益和多重散射。在光激发下，当能量密度超过25 mJ/cm²阈值时，系统中会触发随机激光作用。记录了单次发射光谱以研究发射光谱特性，结果表明激光模式位置的稳定性以及靠近材料增益最大值的模式占主导地位。
