Fabrication of thin film magnetic garnet structures for intra-cavity laser applications

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Abstract
Garnet compositions similar to those used for bubble domain materials have been used to fabricate ferrimagnetic nonreciprocal devices for ring laser gyro biasing at 1.152 μm. Such devices are used inside an active laser cavity, therefore precise control of the optical and physical thickness of the films is required. Two concepts of Faraday elements have been demonstrated and new material and fabrication techniques have been developed to implement them. Operating Faraday elements with 0.5 percent insertion loss have been produced.