Research On The Rotation And Deflection Of Low-power Laser Based On Permanent Magnetic Cofinement

With the rapid development of laser nuclear fusion, X- ray laser and other emerging disciplines, magneto-optical effect is more and more applied in some fields such as measurement, medical, aerospace, manufacturing and so on, playing an increasingly important role in promoting the development of these areas. Among all the magnetic-optical effect, Faraday-Magneto-Optic Effect is the most widely used one and further research about it has never been stopped. In this paper, a experimental platform is designed based on the principle of Faraday-Magneto-Optic Effect. Making a magnetic field with variable structure parameters, Faraday rotator optics material is attached in this magnetic field, then study the optical characteristics of the laser beam passing through the magnetic field to explore whether the rotation-deflection will happen or not, with the change of magnetic field's structure parameters, this experimental platform will surely do something effective to broaden the horizon of Faraday-Magneto-Optic Effect.In this paper, the principle of Faraday-Magneto-Optic Effect is analyzed firstly, and then carry out the overall scheme design of the experimental platform, including hardware structure design, data acquisition and motion control, measurement and control software design, finite element simulation of the constrained magnetic field. The magnetic field on the platform is generated by strong permanent magnets installed in the constraint unit, the radius of the magnetic cavity, the amount of the magnet blocks and the distance between the permanent magnet blocks are the variable structure parameters. The spot area, position coordinate of the gravity center, spot power and the deflection angle of the polarized light can be detected by the test platform. Based on the platform, the characteristics of the HeNe laser spot is detected under various of structure parameters of the constraint unit. reflecting the changes of the propagating characteristics of the laser beam. On the test, with the increase of the magnetic cavity radius and the decreases of the magnet blocks, the deflection angle of the polarized laser is gradually decreased; with the increase of the distance between the permanent magnet blocks, the deflection angle is increased firstly and then decreased. The maximum deflection angle is 86.2° under the condition of 4.3mm magnetic cavity radius, 16 mm distance, 6 magnetic blocks. The minimum deflection angle is 9.8° under the condition of 9.5mm magnetic cavity radius, 14 mm distance, 2 magnetic blocks.