Original title: Shot-noise-limited few-cycle mid-infrared frequency comb with attosecond phase stability
Maciej Kowalczyk, Jakub Jaworski, Michał Pietrzak, Karolina Suliga +4 · September 2026
Scientists want to control mid-infrared light waves with extreme precision, but laser noise makes this difficult. To solve this, researchers built an ultra-stable laser system called an optical frequency combA laser that emits light at many equally spaced frequencies, like the teeth of a comb.. It works by using a specialized crystal laser that produces quick pulses of light at a 2.3 μm wavelength. They widen the laser's color spectrum and squeeze the light into bursts lasting just 11 fs, which is only 1.4 wave cycles long. They also power the system with a custom low-noise amplifier to eliminate flicker. They found that this laser achieved the lowest amplitude noise reported to date for any mode-lockedA technique to produce ultrashort light pulses by locking the phases of different laser frequencies. laser. The output even reached the absolute physical limit of quietness, called shot noise, above 5 kHz. This quietness let them lock the light waves in place with a timing jitter of just 1.8 as, the highest phase stability ever reported for any laser.
Imagine tapping a drum to keep perfect time, but your hand shakes slightly each tap. The shake might be tiny, but over many taps, it adds up and ruins the rhythm. In this paper, the laser is like that drum tap, but they've reduced the hand shake to almost nothing, so each light pulse is timed with astonishing consistency, allowing scientists to study matter at its fastest scales without timing errors.
This level of precision enables scientists to make measurements and control light-matter interactions at scales never before possible. It could lead to advances in quantum physics and metrology, where even the smallest errors matter.
The abstract doesn't explicitly state limitations, but the work focuses on demonstrating the system in a lab setting for mid-infrared wavelengths, not discussing scalability or broader applications.
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Shot-noise-limited few-cycle mid-infrared frequency comb with attosecond phase stability — Maciej Kowalczyk, Jakub Jaworski, Michał Pietrzak et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.