The interacting laser circle is a new laser model that can be used to explore topological defects and disordered structures in seemingly unrelated systems. If you slowly cool the molten iron, the electrons spin in the same direction, creating a strong magnetic field. However, rapid cooling of molten iron will produce magnetic domains arranged in all directions, known as "topological defects." A similar phenomenon may occur when the universe cools rapidly after the big bang. In order to study the formation of topological defects without temperature control in the laboratory, Nir Davidson and colleagues at the Weizmann Institute in Israel have now developed an experimental model of an interacting laser beam. The imaging of the laser intensity allows them to measure a series of parameters for the possibility of forming topological defects. Laser target eye. A circle of 10 interacting lasers (left) synchronize their phases, as shown by the difference between light and dark circles near the center of the image. However, a 20% circle with 20 lasers (right) will cause a topological defect where the two adjacent lasers are out of phase, resulting in a less clear circle between the shades. Photo credit: V. Pal et al. To create their experimental model, Davidson and his colleagues placed a disc containing 10 to 30 holes in a circle in the laser cavity. This "mask" produces a set of laser beams, each of which emits from a different hole and some of it leaks into its two adjacent laser beams, creating an interaction. These interactions cause the phase difference between the light beams to change over time. The evolution of the interaction is so rapid that the research team can simply observe its final state by recording the pattern of laser intensities it produces. This final state represents the combined effect of approximately 1000 different longitudinal modes of the laser in the cavity. Basically equivalent to 1000 independent experiments run at the same time, each independent experiment has a different initial phase relationship between the lasers. In many cases, the laser beam can quickly synchronize its phase, but for some initial phase relationship the beam will be "stuck" at a fixed phase of each laser beam away from its neighboring laser beam. The team showed that when ten lasers were used, the state of these topological defects was exactly eight. The researchers measured the possibility of topological defects by analyzing the laser intensity pattern, such as changing the number of lasers and the power of the laser in the cavity. They found that as laser power increased, topological defects became larger and larger. The team explained the results through simulations, showing that when the laser power is high, the intensity change between the beams drops rapidly, whereas the low power is associated with a slower intensity balance. They claim that a slower equilibrium equates to a slower cooling rate and therefore a lower probability of forming topological defects. Custom Reverse Machine,Water Setting Machine,Tubular Tube Fabric Finish Machine,Crease Remove Machine ZHEJIANG LIANKE MACHINERY CO.,LTD , https://www.zjlinkmachinery.com