Random lasing based on rough dye-doped polymer thin film
In this work, a random laser action from rough dye film processed by surface rubbing with flannelette is reported. For the dye-doped polymer films with high surface roughness by surface rubbing, laser mode is stable, and threshold energy is found to be very low that is 333 μJ/cm2. By analyzing the random lasing spectrum using power Fourier transforms, an average resonator length was estimated as about 18.99 μm, which is 6.4 times larger than the film thickness. Furthermore, the influence of the concentration of Pyrromethene 597 (PM597) on the random laser was studied, and the results indicate that there is an optimum concentration for achieving the lowest threshold. Compared with glass groove structure with the dye doped film, the random laser based on the rough structure has reasonable time stability. This microstructure type random laser reported in this work is in low cost and easy to make compared with other laser structures of this category.
KeywordsMicrostructure Random laser Laser dyes Polymer thin film
This work was supported by the National Science Foundation of China (Grant Number 11174160), (Grant Number 11474052) and (Grant Number 11274062).