We measured the higher-order modes of a diffractive-optic graded-phase resonator by suppressing the lower-order modes of a flash-lamp-pumped Nd:YAG laser with spatial filters. A diffractive-optic end mirror was used to establish a flattop fundamental mode. Measurements of the fundamental and higher-order mode shapes agreed with theoretical models. Quantitative measurements of modal discrimination substantiate the predictions of large discrimination between the fundamental and second-order modes.
© 1995 Optical Society of America
Diana Chen, Zhong Wang, and James R. Leger, "Measurements of the modal properties of a diffractive-optic graded-phase resonator," Opt. Lett. 20, 663-665 (1995)