Stabilizing an optical cavity containing a bulk diamond crystal at millikelvin temperatures in a cryogen-free dilution refrigerator
Researchers stabilized optical Fabry-Pérot cavities at millikelvin temperatures using a cryogen-free dilution refrigerator. They achieved picometer length fluctuations (30pm to 63pm) for bare and diamond-integrated cavities. This demonstrates a method for stabilizing optical systems necessary for quantum applications like microwave-optical photon transduction using diamond impurity spins.