Patent
Bismuth-substituted rare-earth iron garnet crystal film and optical isolator
| العنوان: | Bismuth-substituted rare-earth iron garnet crystal film and optical isolator |
|---|---|
| Patent Number: | 9,322,111 |
| تاريخ النشر: | April 26, 2016 |
| Appl. No: | 13/884371 |
| Application Filed: | November 10, 2011 |
| مستخلص: | A bismuth-substituted rare-earth iron garnet crystal film (RIG) which has an insertion loss of less than 0.60 dB and which can be produced in a high yield, as well as an optical isolator, which is grown by liquid phase epitaxy on a non-magnetic garnet substrate represented by a chemical formula of Gd3(ScGa)5O12, wherein the bismuth-substituted rare-earth iron garnet crystal film is represented by a chemical formula of La3-x-yGdxBiyFe5O12 (provided that 0 |
| Inventors: | Oosumi, Shuuji (Tokyo, JP); Nomi, Yasutaka (Tokyo, JP); Nakamura, Nobuo (Tokyo, JP); Hatanaka, Hiroshi (Tokyo, JP); Kajigaya, Tomio (Tokyo, JP) |
| Assignees: | SUMITOMO METAL MINING CO., LTD. (Tokyo, JP) |
| Claim: | 1. A bismuth-substituted rare-earth iron garnet crystal film which is grown by liquid phase epitaxy on a non-magnetic garnet substrate represented by a chemical formula of Gd 3 (ScGa) 5 O 12 , wherein the bismuth-substituted rare-earth iron garnet crystal film is represented by a chemical formula of La 3-x-y Gd x Bi y Fe 5 O 12 (provided that 0 |
| Claim: | 2. An optical isolator comprising the bismuth-substituted rare-earth iron garnet crystal film according to claim 1 used as a Faraday rotator. |
| Patent References Cited: | 5566017 October 1996 Suzuki 5965287 October 1999 Suzuki 2007/0160875 July 2007 Ohido 2013/0224520 August 2013 Oosumi et al. 6-281902 October 1994 H6-281902 October 1994 H7-281129 October 1995 H8-67600 March 1996 H8-68975 March 1996 H8-290997 November 1996 H8-290998 November 1996 H10-273397 October 1998 2000-66160 March 2000 2000-119100 April 2000 2007-210879 August 2007 2007-256616 October 2007 |
| Other References: | JP06-281902—MT, 10, 1994. cited by examiner JP08-067600—MT, 03, 1996. cited by examiner Kawai et al. IEEE Transactions on Magnetics, 31(6), 1995. cited by examiner JP2000-119100—MT, 04, 2000. cited by examiner Extended European Search Report dated Jun. 24, 2014 issued in counterpart application No. 11845937.9. cited by applicant Walter R. Eppler et al.: “Garnets for Short Wavelength Magneto-Optic Recording”, Journal of Phys. Chem. Solids, vol. 56, No. 11, Apr. 7, 1995, pp. 1479-1490. cited by applicant C. D. Brandle et al.: “Crystal Stoichiometry and Growth of Rare-Earth Garnets Containing Scandium”, Journal of Crystal Growth, vol. 20, Aug. 1973, pp. 1-5. cited by applicant V. J. Fratello et al.: “Growth of Congruently Melting Gadolinium Scandium Gallium Garnet”, Journal of Crystal Growth, vol. 80, No. 1, Jan. 1, 1987, pp. 26-32. cited by applicant G. P. Espinosa: “Crystal Chemical Study of the Rare-Earth Iron Garnets”, The Journal of Chemical Physics, vol. 37, No. 10, Nov. 16, 1962, pp. 2344-2347. cited by applicant V. J. Fratello et al.: “Effect of bismuth doping on thermal expansion and misfit dislocations in epitaxial iron garnets”, Journal of Crystal Growth, vol. 142, May 5, 1994, pp. 93-102. cited by applicant T. Watanabe et al.: “Magneto-Optical Properties of (RBi)3Fe5O12 at 0.8 nm Wavelength Band”, IEEE Translation Journal on Magnetics in Japan, vol. 4, No. 4, Apr. 1989, pp. 221-227. cited by applicant Vincent J. Fratello et al.: “Growth and Characterization of Magnetooptic Garnet Films with Planar Uniaxial Anisotropy”, MRS Proceedings, vol. 834, Jun. 1, 2005, pp. 1-12. cited by applicant V. V. Randoshkin et al.: “Influence of substitutions on the magnetic anisotropy of Gd-containing magnetooptic iron garnet films”, Soviet Physics Technical Physics, American Institute of Physics, vol. 43, No. 5, May 1, 1998, pp. 584-587. cited by applicant T. Tamaki et al.: “Magneto-optical properties of (TbBi)3Fe5O12 and its application to a 1.5 micrometer wideband optical isolator”, Journal of Applied Physics, vol. 70, No. 4581, Oct. 15, 1991, pp. 4581-4583. cited by applicant Z. C. Xu et al.: “Faraday rotation spectra analysis of Bi-substituted mixed rare-earth iron garnet crystals in optical communication band”, Journal of Applied Physics, vol. 101, Mar. 8, 2007, pp. 1-4. cited by applicant International Search Report for International Application No. PCT/JP2011/075920 dated Feb. 14, 2012. cited by applicant |
| Primary Examiner: | Katz, Vera |
| Attorney, Agent or Firm: | Kratz, Quintos & Hanson, LLP |
| رقم الانضمام: | edspgr.09322111 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |