Bismuth-doped rare earth iron garnet single crystal film, preparation method thereof and optical device

Abstract

The invention discloses a bismuth-doped rare earth iron garnet single crystal film, a preparation method thereof and an optical device, and the method comprises the following steps: putting a single crystal component and a cosolvent into a platinum crucible, and heating to melt the single crystal component and the cosolvent; the temperature of the melt in the platinum crucible is reduced to the initial growth temperature, so that the single crystal component is gradually deposited on the surface of a single crystal substrate arranged in the platinum crucible; in the deposition process, the platinum crucible and the single crystal substrate are controlled to rotate reversely, and the rotating direction of the platinum crucible and the rotating direction of the single crystal substrate are converted according to a preset first period; and moving the single crystal substrate by a set distance along the depth direction of the melt according to a preset second period, and uniformly depositing the melts at different depths on the single crystal substrate to form the bismuth-doped rare earth iron garnet single crystal film, according to the preparation method, the single crystal thin film with more uniform magneto-optical performance and optical performance can be prepared, the Faraday coefficient of the single crystal thin film is improved by improving the effective replacement amount of bismuth under the condition that the large film thickness is not needed, and the cracking risk of the single crystal thin film is reduced.

Description

technical field [0001] The present application relates to the technical field of optical communication, and more specifically, to a bismuth-doped rare earth iron garnet single crystal thin film, a preparation method thereof, and an optical device. Background technique [0002] Optical isolator is an indispensable optical device in optical communication. It can transmit forward optical signals, but prevent reflected optical signals from returning, and protect the front optical path. It is used in high-speed and long-distance optical communication systems. widely. The application principle of the optical isolator is the Faraday effect, that is, the phenomenon that the polarization plane of the transmitted light rotates in a transparent medium with a magnetic field applied, and the direction of rotation has nothing to do with the direction of light propagation. At present, bismuth-doped rare earth iron garnet single crystal thin film is used as a Faraday magneto-optic single c...

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Problems solved by technology

[0006] At present, doping bismuth ions is usually used to increase the Faraday coefficient of single crystal thin films. The Faraday rotation coefficient of the film will increase with the concentration of doped Bi ions, and Bi ions will not increase the absorption loss, but as mentioned above , increasing the replacement amount of Bi ions will lead to large lattice distortion and easily cause cracking of the single crystal film; the thickness of the single crystal film can be increased by increasing the growth rate and growth time, but the increase in thickness will affect the thermal stress and The degree of lattice mismatch leads to an increase in thermal stress and lattice mismatch, which increases the risk of cracking

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