An international team of researchers has presented the world’s most compact fiber laser that can operate in the visible range at room temperature. Such a laser system emit green coherent laser beam light at room temperature, herewith, it is possible to detect the light by the naked eye applying a conventional optical microscope.
To be more precise, the compact fiber laser system is made of halide perovskite as the material. Therefore, this material enables them to produce coherent stimulated laser beam emission and to confine electromagnetic energy. The generation of laser beam radiation at room temperature requires “fabrication of a cubic-shaped, 310-nm nanoparticle from the perovskite and photoexcited it with a femtosecond laser pulse.”
The design of the laser system reduces efficiently the stimulated emission energy leading to a high enough amplification of electromagnetic fields for laser beam generation. The researchers claim that fiber laser generation is regarded as a threshold process: the nanoparticle with a laser beam pulse is excited and then this particle creates laser emission at a specific ‘threshold’ intensity of the external source.
It should be noted that the light that is not adequately reduced causes no laser beam emission. Additionally, it is not required to use external pressure or very low temperature for the nanoparticle to work as a fiber laser system. Such a system has been already tested and demonstrated effects described at a regular atmospheric pressure and at room temperature.
Thus, fiber laser technology is regarded as highly promising for producing optical chips, sensors, and other devices that employ laser beam light to transfer and process information, containing chips for optical computers. The green portion of the visible spectrum creates obstacles for the development of laser systems leading to challenges for room temperature nanolasers made of conventional semiconductor materials.
The thing is that fiber lasers that operate in the visible range are more compact than red and infrared (IR) sources with the same properties. “The volume of a small laser typically has a cubic dependence on the emission’s wavelength, and as the wavelength of green laser beam light is three times less than that of IR light, the limit of miniaturization is much greater for green fiber laser systems.” Finally, the developed laser system presents higher importance than previous devices.
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