Scientists developing a terahertz laser beam that breaks several records, Terahertz radiation is used for security checks at airports, for medical examinations and for industrial quality control. However, radiation in the terahertz range is very difficult to produce.
Scientists have been able to develop terahertz radiation sources that break several records: It is very efficient and has a very broad spectrum that produces different wavelengths across the terahertz range. This opens up the possibility of producing short radiation pulses with very high radiation intensities. now the Scientists developing a terahertz laser beam that breaks several records.
Terrarium radiation has many useful properties, researchers say. This can easily penetrate a lot of material, but is not as dangerous as X-rays because it doesn’t ionize radiation.
From a technical point of view, however, terahertz radiation is in the range of frequencies that are very difficult to access in the form of no man’s land between two known regions: high frequency radiation can be produced by ordinary solid-state lasers.
On the other hand, low frequency transmissions, such as those used in cellular communications, are broadcast by antennas. The biggest challenges are in the terahertz range.
Our starting point is the emission of an infrared laser system. It was developed at our institution and is unique throughout the world, researchers say. First, the laser beam is transmitted through what is called a non-linear media. Infrared radiation is modified in this material, and partly converted into radiation with a frequency doubled.
So we have two types of infrared radiation. The two types of radiation then overlap. This creates an electric field wave with a very specific asymmetrical shape. These electromagnetic waves are strong enough to attract electrons from molecules in the air. The air turns into a glowing plasma.
Then a special form of the electric field waves accelerates electrons in such a way that they produce the desired terahertz emitter. Our method is very effective: 2.3% of the energy supplied is converted to terahertz radiation – an order of magnitude that cannot be achieved by other methods.
Another important advantage of this new method is that it produces very wide terahertz radiation. At the same time, many different wavelengths are emitted throughout the terahertz range.
This produces a very intense short pulse of radiation. The greater the spectrum at different terahertz wavelengths, the shorter and more intense pulses can be generated. This means that terahertz radiation sources with very high intensity are available for the first time, according to researchers. Early experiments with zinc telluride crystals have shown that terahertz radiation is well suited to answering important material science questions in a completely new way. We are sure that this method has a bright future.