Micro discharge devices, methods, and systems are described herein. One device includes a non-conductive material, a channel through at least a portion of the non-conductive material having a first open end and a second open end, a first electrode proximate to a first circumferential position of the channel between the first open end and the second open end, a second electrode proximate to a second circumferential position of the channel between the first open end and the second open end, a discharge region defined by a portion of the channel between the first electrode and the second electrode, an optical emission collector positioned to receive an optical emission from the discharge region, and a discharge shielding component between the discharge region and the optical emission collector.