Laser amplifier and laser

Abstract

The embodiments of the present application relate to the technical field of laser apparatuses. Disclosed are a laser amplifier and a laser. The laser amplifier comprises a slab crystal assembly and a reflector, wherein the slab crystal assembly is configured to make a seed light beam incident on the slab crystal assembly for forward zigzag transmission so as to be emitted after being subjected to a first round of amplification; the reflector is arranged on one side of the slab crystal assembly, the reflecting surface of the reflector is configured to be an ellipsoidal surface, and the reflector is configured to reflect the seed light beam emitted after being subjected to the first round of amplification back to the slab crystal assembly; and the slab crystal assembly is further configured to make the seed light beam reflected by the reflector carry out reverse zigzag transmission so as to be emitted from the slab crystal assembly after being subjected to a second round of amplification. In this way, the embodiments of the present application obtain a laser beam with higher gain while meeting the miniaturization requirements for the laser amplifier.

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