A loop-gap resonator for microwave-induced optical nuclear polarization, electron spin-echo experiments, and dynamic nuclear polarization

Abstract A special double loop-gap resonator for CW and pulsed EPR experiments at X band is presented. It allows for simultaneous optical access, high uniaxial pressure on the sample, and NMR and EPR experiments at liquid helium temperatures. It is used for microwave-induced optical nuclear polarization in semiconductors.