The physicist team from the University of California, Riverside (UCR), succeeded in developing new optical instruments that can help gravitational wave observatory such as the gravitational-wave observatory (LIGO) interferometer laser work. The research was led by Jonathan Richardson, Assistant Professor of Physics and Astronomy, and was published in the journal Physical Review Letters.
Gravitational waves are ripples in spaces that arise when massive objects, such as black holes or neutron stars, move quickly or collide. This phenomenon was first predicted by Albert Einstein through the theory of general relativity. However, it takes almost 100 years so that humans can really detect it.
Since 2015, Ligo has recorded around 200 cosmic events, mostly in the form of merging two black holes. There is also a rare event in the form of a collision of two neutron stars. Every time the gravitational waves are detected, scientists get new information about the nature of space-time and extreme objects in the universe.
“Every time we can observe the universe in a new way, there is always the possibility of finding completely unexpected things, astronomy history proves, every new technology opens a new window to the type of object that was previously invisible,” Richardson explained quoted from the UCR page.
The shortcomings that Ligo have to hamper further research
Ligo is one of the biggest scientific instruments in the world. This tool is in the form of a laser interferometer with an arm length of 4 kilometers, which is located in two different locations: Washington State and near Baton Rouge, Louisiana. Both of these detectors work together to listen to small changes in space-time.
However, despite printing many findings, Ligo’s ability is still limited. To look further into the early days of the universe, even before the first star was formed, laser power was needed greater than 1 megawatt. Unfortunately, Ligo is currently unable to reach that level, because an increase in laser power actually causes heat that causes distortion in the main mirror weighing 40 kilograms. This distortion makes the measurement results in less accurate.
Optical technology to overcome the problems in ligo
To overcome this problem, Richardson and his team developed adaptive optical technology with high precision. This instrument is designed to improve distortion in the ligo mirror by emitting low -ranking infrared radiation directly to the mirror surface.
Uniquely, this instrument is installed only a few centimeters in front of the main mirror and uses the principle of non-imaging optical, which is a method that has never been used in previous gravitational wave detection. With this correction, Ligo can handle a much larger laser power without losing accuracy.
“This technology is the first prototype of a new approach that is completely different, we believe this method will open the way to improve the ability of ligo and observatory waves of the next generation,” explained Richardson.
Cosmic Explorer
One of the big plans in the future is the construction of Cosmic Explorer, an observatory for a new generation of gravitational waves in the United States. This tool will be 10 times larger than ligo, with an interferometer arm along 40 kilometers. If it is realized, Cosmic Explorer will be the biggest scientific instrument ever made by humans.
With this giant size, scientists can “see” the universe when he is only around 0.1 percent of the current age which reaches 14 billion years. That is, this observatory is able to peek at the condition of the cosmos even before the first star is formed. (UCR News/Z-2)
