time-divided double optical paths

Optical-optical double resonance

optical-optical double resonance(OODR)

double double iron

Double optical circuit

Double optical feedbacks

double optical fiber coupler

Double optical fibers coupling

double optical path

double optical path-replacement method

double optical trap method

Double optical tweezers

double-optical path

double-optical projection stereoplotter

microwave optical double resonance spectroscopy

optical double stars

optical-optical conversion efficiency

“double-seat double-vote” system

ball mill with double-inlet and double outlet