| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bismuth-substituted rare earth iron garnet crystal film (RIG) capable of being produced with an insertion loss of less than 0.6 dB and a high yield, and to provide an optical isolator. <P>SOLUTION: The bismuth-substituted rare earth iron garnet crystal film is grown on a non-magnetic garnet substrate indicated by chemical formula: Gd<SB POS="POST">3</SB>(ScGa)<SB POS="POST">5</SB>O<SB POS="POST">12</SB>by a liquid-phase epitaxial growth method. The crystal film is indicated by chemical formula: Nd<SB POS="POST">3-x-y</SB>Gd<SB POS="POST">x</SB>Bi<SB POS="POST">y</SB>Fe<SB POS="POST">5</SB>O<SB POS="POST">12</SB>and is characterized by satisfying 0.89≤x≤1.43 and 0.85≤y≤1.19. Compared to conventional RIG, the RIG represented by the chemical formula Nd<SB POS="POST">3-x-y</SB>Gd<SB POS="POST">x</SB>Bi<SB POS="POST">y</SB>Fe<SB POS="POST">5</SB>O<SB POS="POST">12</SB>, can achieve an insertion loss of less than 0.6 dB and a reduction in the amount of generated heat caused by optical absorption at approximately 1 μm wavelength, and as a result, has remarkable effects that allow it to be used in a Faraday rotator for an optical isolator in a high-output laser apparatus for machining. <P>COPYRIGHT: (C)2012,JPO&INPIT |
