摘要:
In an arrangement substantially like an optical isolator, appropriate choice of the composition of the magneto-optic element can result in a variable optical attenuator. The composition is selected to vary in the direction of light propagation, and also is selected such that the magneto-optic element comprises a compensation wall. The compensation wall is movable in response to a change in the temperature of the magneto-optic element, whereby the attenuation of the device is changed.
摘要:
Garnet material according to a particular embodiment of the invention exhibits a substantially rectangular magnetization loop, with .vertline.H.sub.S .vertline.>.vertline.4.pi.M.sub.S .vertline.Oe and .vertline.4.pi.M.sub.s .vertline. 500 Oe) at least at room temperature. Garnet materials according to the invention can advantageously be used in magneto-optic isolators and other magneto-optic devices. For instance, the material enables manufacture of isolators that do not contain a bias magnet. Garnet materials according to the invention generally contain at most relatively small amounts of Gd, Tb and Dy (less than 1.0, 2.1 and 2.5 atoms per formula unit, respectively; with Gd+(Tb/2.1)+(Dy/2.5)
摘要:
Improvements in the production of high-performance latching magneto-optic garnet materials are provided. It has been recognized that high-Europium magneto-optic garnets will offer superior properties in devices such as isolators, circulators and interleavers. However, formation of, e.g., (BiEu)3(FeGa)5O12 on conventional, congruent composition, garnet substrates is difficult, due to poor lattice matching between the magneto-optic garnet and such conventional substrates. The invention addresses this problem, by utilizing a single crystal substrate composed essentially of a solid solution of two or more garnet materials. By use of a solid solution of two or more garnets, e.g., two congruent garnet compositions, an acceptable lattice parameter is able to be attained. Useful solid solutions include gadolinium scandium gallium garnet and gadolinium scandium aluminum garnet, or gadolinium scandium gallium garnet and terbium scandium gallium garnet.
摘要翻译:提供高性能闭锁磁光石榴石材料的生产改进。 已经认识到,高铕磁光石榴石将在诸如隔离器,循环器和交织器的装置中提供优异的性能。 然而,由于磁光石榴石和这种常规基板之间的格子匹配不良,难以形成例如(BiEu)3(FeGa)5 O 12的传统的等效组合物石榴石基材。 本发明通过利用主要由两种或多种石榴石材料的固溶体组成的单晶基板来解决这个问题。 通过使用两个或更多个石榴石的固溶体,例如两个一致的石榴石组合物,可以获得可接受的晶格参数。 有用的固体溶液包括钆镓镓石榴石和钆矾铝石榴石,或钆镓石榴石和铽镓石榴石。