| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain strong joining strength, good insertion loss and extinction ratio while preventing deterioration of optical planes by allowing the metal elements which constitute the surfaces of a Faraday rotator to interact with the metal elements included in a polarizer and an analyzer to make one body. SOLUTION: The Faraday rotator 2 consists of a garnet single crystal, and Al2O3 films 21, TiO2 films 22 and SiO2 films 23 are vapor deposited on both surfaces of the single crystal. The polarizer 1 and the analyzer 3 consist of polarizing glass containing SiO2 in the glass component. A TiO2 film 12 and a SiO2 film are vapor-deposited to form an antireflection coating on one surface of each polarizer 1 and analyzer 3. The Faraday rotator 2, polarizer 1 and analyzer 3 are cleaned, and the surface of the polarzer 1 where the thin films 12, 13 are not formed is abutted to the thin film 23 on one furface of the Faraday rotator 2, while the surface of the analyzer 3 where the thin films 32, 33 are not formed is abutted to the surface of the opposite side of the Faraday rotator 2. These elements as abutted are heated to cause interaction between Si in the thin film 23 and Si in the polarizer 1 or the like to make one body.</p> |
