Laser intracavity absorption magnetometry for optical quantum sensing

• URL: http://arxiv.org/abs/2512.24951v1
• Date: Wed, 31 Dec 2025 16:31:33 GMT
• Title: Laser intracavity absorption magnetometry for optical quantum sensing
• Authors: J. M. Wollenberg, F. Perona, A. Palaci, H. Wenzel, H. Christopher, A. Knigge, W. Knolle, J. M. Bopp, T. Schröder,
• Abstract summary: We introduce laser intracavity absorption magnetometry (LICAM), a concept that is in principle applicable to a broader class of optical quantum sensors, including optically pumped magnetometers.<n>We achieve a 475-fold enhancement in optical contrast and a 180-fold improvement in magnetic sensitivity compared with a conventional single-pass geometry.<n>From our measurements, we determine a projected shot-noise-limited sensitivity in the $mathrmpT,mathrmHz-1/2$ range and show that, with realistic device improvements, sensitivities down to the $mathrmfT,mathrm
• Score: 0.0
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Intracavity absorption spectroscopy (ICAS) is a well-established technique for detecting weak absorption signals with ultrahigh sensitivity. Here, we extend this concept to magnetometry using nitrogen-vacancy (NV) centers in diamond. We introduce laser intracavity absorption magnetometry (LICAM), a concept that is in principle applicable to a broader class of optical quantum sensors, including optically pumped magnetometers. Using an electrically driven, edge-emitting diode laser that operates self-sustainably, we show that LICAM enables highly sensitive magnetometers operating under ambient conditions. Near the lasing threshold, we achieve a 475-fold enhancement in optical contrast and a 180-fold improvement in magnetic sensitivity compared with a conventional single-pass geometry. The experimental results are accurately described by a rate-equation model for single-mode diode lasers. From our measurements, we determine a projected shot-noise-limited sensitivity in the $\mathrm{pT}\,\mathrm{Hz}^{-1/2}$ range and show that, with realistic device improvements, sensitivities down to the $\mathrm{fT}\,\mathrm{Hz}^{-1/2}$ scale are attainable.

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