Laser-elimination of mode beating

摘要

A laser system designed to minimize mode beating by splitting an incident laser beam into two approximately equal components, transmitting the components along separate paths of unequal lengths and recombining the components at a beam combiner to form the emergent laser beam. Laser mode beating is effected at frequencies dependent upon the interferometric path difference. Mode beating elimination at further frequencies is possible using further splitter/combiner combinations in series. A three-color laser modulator uses two different laser sources, each with splitter/combiner mode beating suppression optics. One beam is further split to provide, in all, three paths through three color modulators, the three paths being combined at a dichroic combiner. A color laser projection display system includes conventional line and frame scanning means following the dichroic combiner of the three-color modulator.