Laser communication system

摘要

A laser communication system in which a filter-detector is provided which has a high acceptance angle and a narrow bandwidth. The filter-detector contains vaporized selected atomic species or a molecular composition dissociable to the selected atomic species. The selected atomic species electronic ground state is not absorptive of the laser output wavelength, but the selected atomic species exhibits a metastable or long-lived energy state which when populated absorbs the laser output wavelength. A subsequent transition produces fluorescence from the atomic species as a function of the laser output.