Rare Earth Iron Garnet Films And Magneto-optical Performance Testing

With advances of optical communication and information processing system, extensive investigations on magneto-optical materials and devices have been carried out. Optical isolators are indispensable in these systems. From the point of view of materials science research, The capabilities of magneto-optical materials as the core of optical isolators should be improved on. Bi-substituted magneto-optical materials, have attracted much attention due to their strong enhance MO effects, small absorption loss and high physical-chemical stability.The review part firstly described rare-earth iron garnet's structure, properties, the development process, and the preparation techniques. Then introduced the MO effects, capability testing, classes, application of magneto-optical materials. It also enumerated magneto-optical apparatus. Lastly it introduced the techniques and application of ion beam assisted deposition.The thesis research accomplished the growth of YIG, Bi:YIG and Ce:YIG rare-earth iron garnet with ion beam assisted deposition (IBAD) system on Si substrate. The IBAD system combined inductively coupled plasma (ICP) source and electron beam deposition It is a new method to produce magneto-optical films, and obtained a patent. By depositing with oxygen, the lack of oxygen in the polyatomic compound has been reinforced. So it was easier to form oxide. With oxygen, the surface of films coarsened by oxygen ion beam impacting. The crystal grains become bigger and more in the deposition. The proportion between components approached original proportion, especially in the impure components. It proved the availability of IBAD method in growing Bi:YIG and Ce:YIG rare-earth iron garnet films.In the thesis, Faraday rotation spectra have been measured on rare-earth iron garnet samples by using three different methods with the visible/infrared FR test apparatus using the magneto-optic modulated double-frequency method. The result indicated that the magneto-optical properties of YbilG/YbIG bi-layer films are grown on GGG substrate by LPE method was the best of the three conditions. And Bi-YIG and epoxy magneto-optical hybridized films by coprecipitation was take second place. ButThe Bi-YIG depositing by IBAD method couldn't discover MO effect. The apparatus has become one of the most important testing tools in the laboratory. It could choose 633nm He-Ne laser or 1310nm/1550nm semiconductor laser as lamp-house, the amplificatory effect reached 150 multiple, with anti-jamming function. The apparatus also appended temperature changing test apparatus and computer data processing programs. The Faraday rotation repletion precision reached 0.01° at the wavelength of 633nm, 1310nm and 1550nm in 10~80℃...