Method for manufacturing optical isolator and optical isolator

An optical isolator comprising:

• a magnet including a through hole through which light passes;
• a Faraday element provided in the through hole of the magnet;
• a first polarizer disposed toward one end surface of the magnet in a direction of an optical axis, the direction of the optical axis being a direction of the light passing through the through hole of the magnet;
• a second polarizer disposed toward the other end surface of the magnet in the direction of the optical axis;
• a first polarizer holder housing the first polarizer;
• and
• a second polarizer holder housing the second polarizer,
• wherein at least one magnetic body is placed in the first polarizer holder.

An optical isolator comprising:

• a magnet including a through hole through which light passes;
• a Faraday element provided in the through hole of the magnet;
• a first polarizer disposed toward one end surface of the magnet in a direction of an optical axis, the direction of the optical axis being a direction of the light passing through the through hole of the magnet;
• a second polarizer disposed toward the other end surface of the magnet in the direction of the optical axis;
• a first polarizer holder housing the first polarizer;
• and
• a second polarizer holder housing the second polarizer,
• wherein the first polarizer holder includes a threaded hole and the threaded hole is hollow.