Abstract
We have demonstrated the realization of a coherent vesicle random lasing (VRL) from the dye doped azobenzene polymer vesicles self-assembled in the tetrahydrofuran-water system, which contains a double-walled structure: a hydrophilic and hydrophobic part. The effect of the dye and azobenzene polymer concentration on the threshold of random laser has been researched. The threshold of random laser decreases with an increase in the concentration of the pyrromethene 597 (PM597) laser and azobenzene polymer. Moreover, the scattering of small size group vesicles is attributed to providing a loop to boost the coherent random laser through the Fourier transform analysis. Due to the vesicles having the similar structure with the cell, the generation of coherent random lasers from vesicles expand random lasers to the biomedicine filed.
Highlights
IntroductionLetokhov theoretically proposed random lasers (RLs), which have been realized in the disordered gain medium based on light being amplified due to the multiply light scattering as a feedback cavity [1]
In order to study the effect of dye concentration on random lasers, random lasing spectra of 0.156 wt.%, 0.234 wt.%, and 0.312 wt.% dye doped vesicles can be shown in Figs. 4(a), 4(c), and 4(e) while the concentration of azo polymer is 0.104 wt.%
This work systematically demonstrates the form of dye-doped azobenzene polymer vesicles and realization of coherent random lasers
Summary
Letokhov theoretically proposed random lasers (RLs), which have been realized in the disordered gain medium based on light being amplified due to the multiply light scattering as a feedback cavity [1]. The key element of traditional lasers includes a resonator cavity, which is usually composed of several mirrors to feedback the amplified light. Different from the traditional lasers, the RLs do need the fussy resonator cavity to be a feedback medium, which only relies on the multiply light scattering to form a random loop, and it can simplify the structure of RLs [9,10,11,12,13]. In order to make the threshold lower, the fiber random laser has been developed [14,15,16]
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