Optical amplification component and fiber laser device

An optical amplification component comprising:

• a heat dissipation plate;
• and
• an amplification optical fiber arranged on the heat dissipation plate, the amplification optical fiber including
• a first section extending from a reference position between a first end and a second end of the amplification optical fiber up to a position at which a first fiber portion extending from the reference position toward the first end and a second fiber portion extending from the reference position toward the second end are aligned in one direction, and
• a second section where the first fiber portion and the second fiber portion are wound in a spiral outside the first section along each other,
• wherein the circumference of a first end part of the amplification optical fiber and the circumference of a second end part of the amplification optical fiber are separated from side surfaces of the first fiber portion and the second fiber portion wound in a spiral, and
• wherein the heat dissipation plate has a structure in which a thermal resistance in a first heat dissipation area in which each of the first end part and the second end part of the amplification optical fiber is arranged is smaller than the thermal resistance in a second heat dissipation area in which the first section is arranged such that the amount of heat dissipation in the first heat dissipation area is larger than the amount of heat dissipation in the second heat dissipation area.