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We propose to use an optical cavity to enhance the sensitivity ofmagnetometers relying on the detection of the spin state of high-densitynitrogen-vacancy ensembles in diamond using infrared optical absorption. Therole of the cavity is to obtain a contrast in the absorption-detected magneticresonance approaching unity at room temperature. We project an increase in thephoton shot-noise limited sensitivity of two orders of magnitude in comparisonwith a single-pass approach. Optical losses can limit the enhancement to oneorder of magnitude which could still enable room temperature operation.Finally, the optical cavity also allows to use smaller pumping power when it isdesigned to be resonant at both the pump and the signal wavelength.

Magnetometry with nitrogen-vacancy ensembles in diamond based on infrared absorption in a doubly resonant optical cavity