Faraday's rotator and optical isolator
US5479290A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1994 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | May 10, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F10/245
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A Faraday's rotator comprises a magnetic crystal which has a composition represented by the following compositional formula: (Tb.sub.1-(a+b+c+d) Ln.sup.1.sub.a Ln.sup.2.sub.b Bi.sub.c M.sup.1.sub.d).sub.3 (Fe.sub.1-e M.sup.2.sub.e).sub.5 O.sub.12, has a lattice constant of 12.383.+-.0.006 .ANG. and is grown through the liquid phase epitaxial growth technique. In the foregoing formula, Ln.sup.1 is at least one element selected from the group consisting of Yb, Lu and Tm; Ln.sup.2 is at least one member selected from the group consisting of rare earth elements except for Yb, Lu, Tm and Tb; M.sup.1 is at least one element selected from the group consisting of Ca, Mg and Sr; M.sup.2 is at least one element selected from the group consisting of Al, Ga, Ti, Si and Ge; 0.2.ltoreq.a.ltoreq.0.6, 0.ltoreq.b.ltoreq.0.3, 0 <c.ltoreq.0.16, 0<d.ltoreq.0.02 and 0<e.ltoreq.0.1. Another Faraday's rotator comprises a magnetic crystal having a composition represented by the following compositional formula: (Tb.sub.1-(a+b+c+d+f) Ln.sup.1.sub.a Ln.sup.2.sub.b Bi.sub.c M.sup.2.sub. e).sub.5 O.sub.12, wherein Ln.sup.1, M.sup.1, M.sup.2, a, b, c and e are the same as those defined above; Ln.sup.2 is a memb…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.