微型随机激光辐射特性的控制

为了对随机激光输出特性进行有效地控制,将随机介质纳米团簇植入到光子晶体中,利用有限时域差分法进行模拟,比较了团簇置于空气中和光子晶体中的输出特性.结果表明:当把团簇单纯地置于空气中,被激发后辐射光的能量会随时间慢慢减少,光谱呈自发辐射的特性|而当将这个团簇植入一光子晶体中,一些原始的自发辐射谱峰会逐渐消失,其中一个谱峰会快速上升,最后成为光谱中唯一的一个能量最强的谱峰.因此如果一个无序的系统置于一个匹配的有序系统中,光能被有效地限制,自发辐射能被抑制,激发模式会被调制,系统的有效增益会被提高,激光阈值能被减少.

Control of Radiation Characteristics of a Micro Random-laser

  To control the radiation characteristics of random laser effectively,the random medium nano-cluster was put in a photonic crystal(PC).The finite difference time domain(FDTD) method was used to simulate its radiation characteristics after it was placed in the air and in the PC.The results show that if the cluster is put in the air,the radiation energy decreases gradually after being excited,and its emission spectra take on spontaneous emission characteristics.However,when the cluster is introduced into a PC,some spontaneous emission spectral peaks will drop off,one of which will leave and grow in intensity rapidly.Finally,it becomes the strongest single spectral peak.Therefore,if a random gain system is able to be put into a matching ordered system,the light can be confined and the spontaneous emission can be forbidden.