Scientists combine gas with multicore fibers to create mid-infrared laser wavelengths
On February 25, 2016, the latest issue of the Optica Magazine of the American Optical Society published the research results of the researchers at Bath University in the United Kingdom on the mid-infrared fiber gas laser. Mid-infrared lasers ranging from 3.1 to 3.1 microns have important applications in special applications such as spectral analysis, environmental monitoring and explosives detection, but lasers in this area have not been easy to produce.
The University of Bath scientists combine suitable gases into hollow fibers to achieve mid-infrared laser radiation that combines mid-infrared wavelengths with the stability, convenience, high-quality, and high-power output characteristics of fiber lasers. William Wadsorth, one of the project's leaders, said traditional fiber lasers do not easily sustain high powers above 2.8 microns, while other similar quantum cascade lasers do not support laser wavelengths below 3.5 microns. This problem is solved with the multicore hollow fiber of silica material they have developed. Wadsorth compared their multi-core fiber structure to a series of glass tubes by which the light is transmitted in the hollow core by the reflection limits of the glass tubes rather than in the glass core as in normal fiber. It is this feature that assures that this fiber has no absorption of wavelengths above 2.8 microns as normal fiber does. The benefits of hollow fiber is that the transmission intermediary distance is long enough. In this example, they used 10 to 11 meters of hollow fiber, of which is acetylene gas.
Researchers at the University of Bath did not first think of filling a particular gas in fiber optics, a similar design had been used before. Their idea is to add a period of feedback fiber to create a reflective cavity. The reflective section amplifies a portion of the output light, reducing the need for pump power. In this design, a sophisticated communications semiconductor laser is used. This laser is practical enough, cheap enough and powerful enough.
Fei Yu, a Chinese scholar at the Bath team, said they have developed a laser wavelength that utilizes light to pump molecules and produce less than traditional techniques. This combination of gas and optical fiber technology can be used to develop more types of lasers. Different gases, up to 5 microns of laser can also use this technology to produce it.
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