Eye-safe coherent laser radar

摘要

In an eye-safe coherent laser radar, a laser diode optically pumps a solid state non-planar ring laser to produce the coherent output laser radiation. The laser radiation is passed through a Faraday isolator to an optically pumped slab three-stage linear amplifier imparting 56 db gain. A telescope transmits the amplified laser radiation to illuminate a target. Optical radiation returned from the target is collected by the telescope and focused into a single transverse mode fiber-optic waveguide for combination in the fiber with reference lasant radiation by means of a single mode fiber coupler. The combined optical radiation is then detected by a photodetector to produce a difference frequency output representative of parameters of the target.