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In stark contrast to previous demonstrations where lasers were locked to the cavities, our setup locks the cavity to the laser, thereby ensuring that emitted photons remain at a stable, predetermined frequency. This stability is advantageous for efficient quantum networking applications (e.g., remote entanglement generation) that require indistinguishable photons. Our measurements of cavity length fluctuation suggest that the setup could stabilize a cavity up to a finesse of 1.3 \u00d7 104 without the diamond and 5.3 \u00d7 103 with the diamond crystal. 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