2×10−13 Fractional Laser-Frequency Stability with a 7-cm Unequal-Arm Mach-Zehnder Interferometer
Physical Review Applied2023Vol. 20(2)
Citations Over TimeTop 15% of 2023 papers
Victor Huarcaya, M. Dovale Álvarez, Daniel Penkert, Stefano Gozzo, Pablo Caño, Kohei Yamamoto, Juan José Esteban Delgado, M. Mehmet, K. Danzmann, Gerhard Heinzel
Abstract
To reach subpicometer sensitivities in the millihertz frequency range, inertial sensors based on laser interferometry must reduce laser-frequency noise, typically by using ultrastable optical reference cavities or atomic or molecular references. This study presents a simpler solution: a quasimonolithic Mach-Zehnder interferometer with intentionally mismatched arm lengths, plus two photodiodes at balanced output ports. Here structural stability is transferred to laser frequency via amplification, integration, and feedback of the balanced-detection signal. Improvements to the thermal design and isolation of a compact setup allow stabilities similar to those of reference systems.
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