MANUFACTURING METHOD OF FARADAY ROTATOR

摘要

PROBLEM TO BE SOLVED: To manufacture a Faraday rotator without polishing the surface of a bismuth substituted rare-earth iron garnet single crystal film having thickness of more than 150μm which is made to grown on one side surface of a non-magnetic garnet single crystal substrate by a liquid phase epitaxial method. SOLUTION: After growing crystals, a molten liquid deposited on a bismuth substituted rare-earth iron garnet single crystal film is shaken off and the operations until the film is housed from a liquid phase epitaxial growing furnace to a slow cooling furnace having internal temperature of 400 to 550 deg.C are completed within 20 minutes after growing the crystals. Then, after the film is cooled down to a room temperature, the solidified molten liquid components deposited on the film are dissolved by an acid to be removed and is made to a Faraday rotator as it is in an unpolished state. Thus, the film having thickness of more than 150μm with a substrate is obtained capable of using as a Faraday rotator without polishing.