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Extending LIGO's Reach Into the Cosmos
Extending LIGO's Reach Into the Cosmos
September 29, 2021
New mirror coatings will increase the volume of space LIGO can probe in its next run
Since LIGO's groundbreaking detection, in 2015, of gravitational waves produced by a pair of colliding black holes, the observatory, together with its European partner facility Virgo, has detected dozens of similar cosmic rumblings that send ripples through space and time.
In the future, as more and more upgrades are made to the National Science Foundation-funded LIGO observatories—one in Hanford, Washington, and the other in Livingston, Louisiana—the facilities are expected to detect increasingly large numbers of these extreme cosmic events. These observations will help solve fundamental mysteries about our universe, such as how black holes form and how the ingredients of our universe are manufactured.
One important factor in increasing the sensitivity of the observatories involves the coatings on the glass mirrors that lie at the heart of the instruments. Each 40-kilogram (88-pound) mirror (there are four in each detector at the two LIGO observatories) is coated with reflective materials that essentially turn the glass into mirrors. The mirrors reflect laser beams that are sensitive to passing gravitational waves.
Generally, the more reflective the mirrors the more sensitive the instrument, but there is a catch: The coatings that make the mirrors reflective also can lead to background noise in the instrument—noise that masks gravitational-wave signals of interest.
Now, a new study by the LIGO team describes a new type of mirror coating made of titanium oxide and germanium oxide and outlines how it can reduce background noise in LIGO's mirrors by a factor of two, thereby increasing the volume of space that LIGO can probe by a factor of eight.
The entire measurement procedure takes a few hours to complete, and it is completely automated and controlled either remotely or from the laboratory workstation. The colorful images above the computer screens show some of the ways the disk can vibrate. Those vibrations modes are detectable by the instrument and are used to determine the properties of the mirror material being tested.
Researchers test coatings for the LIGO mirrors by depositing them on glass disks that are smaller than the real mirrors, and therefore easier to handle. One of those test disks is shown here being taken out of its storage container.
Credit: Caltech
The pinkish color in the photo is due to a thin layer of a metal oxide coating deposited on the surface.
The disk is then placed inside a vacuum chamber where its mechanical properties and energy dissipation can be measured. The less energy that is dissipated in the mirrors, the more sensitive the LIGO detectors will be. The vacuum chamber is visible in the back, while in the forefront one can see the optics used to steer the laser beam that probes the disk vibrations.
A view of the measurement system from one of the vacuum chamber windows. The red dots are produced by the probe laser beam.
A view of the inside of the measurement vacuum chamber: four samples with different materials can be measured at the same time.
After the samples are placed inside the chamber, some fine tuning is required to ensure that they are horizontal and perfectly centered.
The vacuum chamber is shown close up, right before the air is pumped out. The chamber must reach a pressure of less than one billionth of Earth's atmosphere before it is possible to start observing the vibrations of the disk and measuring the energy dissipation in the coating material.
The chamber is closed and the pumping can now start. In about one hour, almost all the air will be out of the chamber and the instrument will start taking data.
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The entire measurement procedure takes a few hours to complete, and it is completely automated and controlled either remotely or from the laboratory workstation. The colorful images above the computer screens show some of the ways the disk can vibrate. Those vibrations modes are detectable by the instrument and are used to determine the properties of the mirror material being tested.
Researchers test coatings for the LIGO mirrors by depositing them on glass disks that are smaller than the real mirrors, and therefore easier to handle. One of those test disks is shown here being taken out of its storage container.
The vacuum chamber is shown close up, right before the air is pumped out. The chamber must reach a pressure of less than one billionth of Earth's atmosphere before it is possible to start observing the vibrations of the disk and measuring the energy dissipation in the coating material.
The chamber is closed and the pumping can now start. In about one hour, almost all the air will be out of the chamber and the instrument will start taking data.
"We wanted to find a material at the edge of what is possible today," says Gabriele Vajente, a LIGO senior research scientist at Caltech and lead author of a paper about the work that appears in the journal Physical Review Letters. "Our ability to study the astronomically large scale of the universe is limited by what happens in this very tiny microscopic space."
"With these new coatings, we expect to be able to increase the detection rate of gravitational waves from once a week to once a day or more," says David Reitze, executive director of LIGO Laboratory at Caltech.
The research, which may have future applications in the fields of telecommunications and semiconductors, was a collaboration between Caltech; Colorado State University; the University of Montreal; and Stanford University, whose synchrotron at the SLAC National Accelerator Laboratory was used in the characterization of the coatings.
LIGO detects ripples in space-time using detectors called interferometers. In this setup, a powerful laser beam is split into two: each beam travels down one arm of a large L-shaped vacuum enclosure toward mirrors 4 kilometers away. The mirrors reflect the laser beams back to the source from which they originated. When gravitational waves pass by, they will stretch and squeezes space by nearly imperceptible and yet detectable amounts (much less than the width of a proton). The perturbations change the timing of the arrival of the two laser beams back at the source.
Any jiggling in the mirrors themselves—even the microscopic thermal vibrations of the atoms in the mirrors' coatings—can affect the timing of the laser beams' arrival and make it hard to isolate the gravitational-wave signals.
"Every time light passes between two different materials, a fraction of that light is reflected," says Vajente. "This is the same thing that happens in your windows: you can see your faint reflection in the glass. By adding multiple layers of different materials, we can reinforce each reflection and make our mirrors up to 99.999 percent reflective."
"What's important about this work is that we developed a new way to better test the materials," says Vajente. "We can now test the properties of a new material in about eight hours, completely automated, when before it took almost a week. This allowed us to explore the periodic table by trying a lot of different materials and a lot of combinations. Some of the materials we tried didn't work, but this gave us insights into what properties might be important."
In the end, the scientists discovered that a coating material made from a combination of titanium oxide and germanium oxide dissipated the least energy (the equivalent of reducing thermal vibrations).
"We tailored the fabrication process to meet the stringent demands in optical quality and reduced thermal noise of the mirror coatings," says Carmen Menoni, professor at Colorado State University and member of the LIGO Scientific Collaboration. Menoni and her colleagues at Colorado State used a method called ion beam sputtering to coat the mirrors. In this process, atoms of titanium and germanium are peeled away from a source, combined with oxygen, and then deposited onto the glass to create thin layers of atoms.
The new coating may be used for LIGO's fifth observing run, which will begin in the middle of the decade as part of the Advanced LIGO Plus program. Meanwhile, LIGO's fourth observing run, the last in the Advanced LIGO campaign, is expected to commence in the summer of 2022.
"This is a great example of how LIGO relies heavily on cutting-edge optics and materials science research and development," says Reitze.