Photon-regeneration experiments which search for the axion, or axionlike particles, may be resonantly enhanced by employing matched Fabry-Perot optical cavities encompassing both the axion production and conversion magnetic field regions. Compared to a simple photon-regeneration experiment, which uses the laser in a single-pass geometry, this technique can result in a gain in rate of order F², where F is the finesse of the cavities. This gain could feasibly be 10⁽¹⁰⁻⁻¹²⁾, corresponding to an improvement in sensitivity in the axion-photon coupling g_aγγ of order F1/2~10(2.5--3), permitting a practical purely laboratory search to probe axion-photon couplings not previously excluded by stellar evolution limits or solar axion searches.
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Sikivie et al. (2007) studied this question.
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