According to reports, an international team from the University of Rome in Italy and the Technical University of Munich in Germany created the first controllable random laser based on cellulose paper, which successfully utilized the light scattering effect of ceramic titanium dioxide.
In general, a laser has two important components: first, the medium that needs to amplify the light; and second, the structure that holds the light in the medium. Classical lasers use mirrors to align and illuminate the target evenly. In contrast to this feedback mechanism with mirror reflection, the feedback mechanism of random lasers is based on random scattering, and the internal microstructure can also emit light, but the light scattering direction is different.
The Strawbin Science Center at the Technical University of Munich focuses on material synthesis research in the field of biopolymers, using models of natural and biological materials to develop new materials and technologies. In the experiment, they impregnated conventional laboratory filter paper with the organometallic compound tetraethyl orthosilicate, and after drying it was placed at a temperature of 500 degrees Celsius to form ceramic titanium dioxide which is commonly used in sunscreens.
The sunscreen effect of sunscreens is based on the strong light scattering effect of titanium dioxide, which is also exploited by random lasers. The research team believes that the long fibers in the filter paper can form a stable structure and can therefore be used as a structural template for random lasers.
The researchers also found that with the help of spectrometers, they were able to distinguish lasers of different wavelengths in the structural template material and position them separately and separate them from each other. Although the development of random lasers is still in its infancy, it can be used as a microswitch or to detect structural changes in view of its multi-directionality and multi-color functional characteristics.
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