It significantly reduces the effective modal reflectivity facets (18, 16) angular antireflection coated to a traveling wave laser amplifier, by flaring the portion of wave guide (22, 24) in the immediate vicinity of the facets amplifier . Thus obtained low-reflectivity facets with antireflective coatings (19, 17) simple, low cost, generating economic amplifiers characterized by a wide bandwidth and a high output saturation power.
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