Penerobosan Laser Baharu untuk Gelombang Graviti Akan Menguji Had Asas Relativiti Am

Konsep artis tentang gelombang graviti yang merambat melalui ruang angkasa.

Penemuan laser baharu untuk membantu meningkatkan pemahaman tentang[{” attribute=””>gravitational waves.

Scientists have created a proof-of-concept setup of a new laser eigenmode sensor that offers over 1,000 times the sensitivity. After translating this work to gravitational wave detectors, they will offer the unprecedented precision needed to test the fundamental limits of general relativity and probe the interiors of neutron stars.

Gravitational wave scientists from The University of Western Australia (UWA) have led the development of a new laser mode sensor with unprecedented precision that will be used to probe the interiors of neutron stars and test the fundamental limits of general relativity.

Gravitational waves are “cosmic ripples” in space-time caused by some of the most energetic and violent processes in the Universe such as neutron stars or black holes orbiting each other, colliding black holes, supernovae, and colliding neutron stars.

Research Associate from UWA’s Center of Excellence for Gravitational Wave Discovery (OzGrav-UWA) Dr. Aaron Jones, said UWA co-ordinated a global collaboration of gravitational wave, metasurface, and photonics experts to pioneer a new method to measure structures of light called “eigenmodes.”

“Gravitational wave detectors like LIGO, Virgo, and KAGRA store enormous amount of optical power, and several pairs of mirrors are used to increase the amount of laser light stored along the massive arms of the detector,” Dr. Jones said.

“However, each of these pairs has small distortions that scatters light away from the perfect shape of the laser beam which can cause excess noise in the detector, limiting sensitivity and taking the detector offline.

“We wanted to test an idea that would let us zoom in on the laser beam and look for the small ‘wiggles’ in power that can limit the detectors’ sensitivity.”

Laser Breakthrough Gravitational Waves Apparatus

A schematic of the apparatus used by the researchers. ‘f’ is the focal length of the lens. Credit: University of Western Australia

Dr. Jones said a similar problem is encountered in the telecoms industry where scientists are investigating ways to use multiple eigenmodes to transport more data down optical fibers.

“Telecoms scientists have developed a way to measure the eigenmodes using a simple apparatus, but it’s not sensitive enough for our purposes,” he said. “We had the idea to use a metasurface – an ultra-thin surface with a special pattern encoded in sub-wavelength size – and reached out to collaborators who could help us make one.”

The proof-of-concept setup the team developed was over one thousand times more sensitive than the original apparatus developed by telecoms scientists and the researchers will now look to translate this work into gravitational wave detectors.


Gelombang graviti ialah herotan dalam ruang masa yang terhasil daripada pergerakan objek berjisim. Kredit: ESO/L. Calçada

Ketua Penyiasat OzGrav-UWA Profesor Madya Chunnong Zhao berkata perkembangan itu merupakan satu lagi langkah ke hadapan dalam mengesan dan menganalisis maklumat yang dibawa oleh gelombang gravitimembolehkan kita memerhati alam semesta dengan cara baharu.

“Menyelesaikan masalah penderiaan mod dalam pengesan gelombang graviti masa hadapan adalah penting jika kita ingin memahami bahagian dalam bintang neutron dan seterusnya pemerhatian kita terhadap alam semesta dengan cara yang tidak pernah mungkin berlaku sebelum ini,” kata Profesor Madya Zhao.

Kejayaan itu diperincikan dalam kajian yang diterbitkan dalam Kajian Fizikal.

Untuk lebih lanjut mengenai penyelidikan ini, lihat Saintis Gelombang Gravitasional Merintis Penderia Mod Laser Baharu Dengan Ketepatan Belum Pernah Terjadi sebelum ini.

Rujukan: “Penguraian mod spatial dipertingkatkan Metasurface” oleh Aaron W. Jones, Mengyao Wang, Xuecai Zhang, Samuel J. Cooper, Shumei Chen, Conor M. Mow-Lowry dan Andreas Freise, 26 Mei 2022, Kajian Fizikal A.
DOI: 10.1103/PhysRevA.105.053523

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Penerobosan Laser Baharu untuk Gelombang Graviti Akan Menguji Had Asas Relativiti Am


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