Moon's Dark Craters Could Host Super Stable Lasers for Better Navigation

Lasers in dark Moon craters could be stable for minutes, much longer than the few seconds possible on Earth. This could greatly improve navigation.
By Newsroom | Space, Technology |

Precision timing and navigation could be revolutionized by placing ultrastable lasers in the Moon's permanently shadowed craters.

Researchers are exploring the deployment of highly stable lasers within the Moon's perpetually dark polar craters. These regions, untouched by direct sunlight, offer extreme cold and darkness, conditions ideal for creating lasers with unprecedented coherence times. This could allow for minute-long laser stability, a significant leap from the few seconds achievable with similar technology on Earth, potentially transforming lunar navigation, timing accuracy, and even fundamental physics experiments.

The proposed system hinges on an 'optical silicon cavity', a compact component designed to fit within an Artemis mission spacecraft. Astronauts or robotic rovers would position this cavity within the frigid, shadowed craters. The inherent stability of these lunar environments—characterized by consistent temperatures around 100 mK and minimal vibration—is key to enhancing laser performance.

The primary envisioned application is enhancing navigation and positioning for lunar landers and rovers. Such a laser system could provide a precise reference point, reducing the risks associated with polar landings and enabling more autonomous operations.

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Dark lunar craters could host ultrastable lasers for moon navigation - 1

"The permanently shadowed regions on the moon remain central to long-term lunar exploration because they contain water-ice and other resources needed to maintain a human presence."

Beyond Navigation: A Cosmic Timekeeper

The potential applications extend beyond local lunar operations. The extreme stability of a lunar-based laser could serve as a 'reference laser' for Earth-based activities. The slight delay in a laser beam's travel time between the Moon and Earth—just over a second—could enable new forms of precision timing and potentially even experiments related to gravitational waves or space-time ripples.

The Science of Stability

An ultrastable laser maintains synchronized light waves for extended periods, a property known as coherence. On Earth, cryogenic silicon cavities have achieved minute-scale stability, but lunar deployment offers advantages:

  • Temperature Stability: Permanently shadowed craters maintain natural temperatures between 20-50 Kelvin, with projected temperatures within silicon cavities below 100 mK.

  • Vibration Isolation: The lunar surface inherently offers a quieter, less vibratory environment compared to Earth.

This enhanced stability is crucial for advanced optical clock development and precision metrology.

Background: A Long Shadow of Exploration

The concept emerged from discussions about instruments suitable for NASA's 'Artemis' missions. Lunar south pole craters, known for their perpetual darkness, were identified as prime locations due to their potential resources, such as water ice, crucial for sustained human presence. The development of such technology builds upon decades of research into ultrastable lasers and optical cavities, pushing the boundaries of precision measurement.

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Frequently Asked Questions

Q: Why do scientists want to put lasers in dark craters on the Moon?
Scientists want to use the extreme cold and darkness in the Moon's permanently shadowed craters to make lasers much more stable than they can be on Earth. This could help with navigation and timing.
Q: How will these lasers help spacecraft on the Moon?
The super stable lasers could act as a precise guide for landers and rovers, making it safer and easier for them to move around, especially near the Moon's poles.
Q: Can these lasers help us on Earth too?
Yes, a very stable laser on the Moon could be used as a reference point for activities on Earth, improving our ability to measure time very accurately and even helping with experiments about gravity.
Q: What makes the Moon's craters good for these lasers?
The craters are always dark and very cold, around 100 millikelvin, which is much colder than anything we can easily make on Earth. They also have less shaking or vibration than Earth, which helps the lasers stay steady.