OPTICAL AMPLIFIER AND RESONATOR

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[Object] An optical amplifier and a resonator capable of outputting output light having a high intensity are provided. [Solving Means] An optical amplifier 100 includes : a first optical fiber 20, through which seed light and excitation light propagate; an optical coupler 30 that inputs the excitation light into the first optical fiber 20; a first lens 40 to which the seed light and the excitation light output from the first optical fiber 20 are input and which increases diameters of the seed light and the excitation light; a glass rod 50 doped with rare earth elements to be excited by the excitation light, to which the seed light and the excitation light output from the first lens 40 are input and which amplifies and outputs the seed light as output light; a second lens 60 to which at least the output light output from the glass rod 50 is input and which decreases a diameter of the output light; and a second optical fiber 70 to which the output light output from the second lens 60 is input and through which the output light propagates.