Just as the heroic weapons of inferior films and interstellar fiction chose weapons first when they came to mind, they were all laser weapons that generate a beam of coherent electromagnetic radiation by stimulating atoms or molecules to excite photons, but the rate of technological improvements has been A bit outdated.
Today's lasers are used industrially very often, and are involved in the printing of document files in home offices and in applications such as playing movies in a home theater. Not only that, it also appears in medical journals and military news, but for the rest of the time it's basically just being applied to being reduced to reading bar code applications, which is overkill.
But the laser is still very interesting, Sushil Kumar of Lehigh University insists there are lots of potential innovations that we have just started on. With the support of the National Science Foundation (NSF), he is having a plan for exploring its applications.
Kumar, an associate professor in electrical and computer engineering, pays particular attention to the relatively undeveloped spectral regions of those lasers in the electromagnetic spectrum, namely THz, or far-infrared frequencies. A researcher at the cutting edge of terahertz quantum cascade laser technology, he and his colleagues have released high-temperature environments and other important performance characteristics, and the results of their lasers have also become a new world record.
His research goal is to develop equipment that opens up a wide range of possible applications such as biological, chemical sensing, spectroscopy, explosives, as well as detection of prohibited materials, detection of disease, quality control of drugs and even understanding of stellar stars in telemetry astronomy And galaxy formation, here are just a few examples. (These are pretty cool stuff that will impress you.)
However, in addition to the known advantages, Kumar said, terahertz lasers have been fully utilized and explored; however, the limitations of high cost and functionality hindered the application of innovation in a variety of fields. However, Kumar believes he is expected to truly unlock the potential of terahertz laser technology; he recently received a grant from the National Science Foundation to target phase-locked ultra-narrow beam arrays for high-power terahertz lasers and to create terahertz Lasers produce greater light intensity than current devices and remove barriers for large-scale research commercial applications.
Focus on solutions
According to Kumar, the terahertz region of the electromagnetic spectrum has not been studied yet due to the lack of high-power radiation sources. Existing radiation sources have low output power with some other undesirable spectral characteristics that make them seriously unsuitable for use in applications. His current project aims to develop terahertz-lasers with average optical powers of up to 100 milliwatts, which will be orders of magnitude higher than existing technologies and have narrow beam characteristics that are significantly less than a five-degree divergence angle.
Kumar's Quantum Cascade Lasers (QCLs) were originally invented for the emission of mid-infrared radiation. They have only recently begun attempts at terahertz frequencies, within which they have encountered some additional challenges. In this cutting-edge environment, Kumar's group is among the few research groups in the world that have made progress in these promising low-cost lasers.
Kumar's research on quantum cascade lasers will greatly increase the output power and beam quality. Portable electric chillers will provide the required cooling temperatures for the semiconductor laser chips; these will include the phase-locked quantum cascade laser emitter array, the frequency required for a series of discrete terahertz applications.
In his previous work, Kumar and his team showed that terahertz lasers (with an emission wavelength of about 100 microns) can utilize a light-focused beam of light called distributed feedback. The laser's light energy is confined to a cavity sandwiched between two metal plates at a distance of 10 microns. Using a box of 100 microns multiplied by 1400 microns by 10 microns, the research team produced a terahertz laser with a beam divergence of 4 degrees by 4 degrees, which is not yet available for this narrow divergence angle terahertz laser achieve.
Kumar believes most of today's companies that use mid-infrared lasers are interested in this powerful and affordable terahertz quantum cascade laser, and the technology itself will generate new solutions.
"Before developers can write" heavyweight apps "to make it a home product, we first need an iPhone," he said. "Similarly, the technology we are working on will allow future researchers to change the world in ways never before seen."
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