The length of the entire magnetic system is 140 mm and the external diameter is 125 mm. explained a magnetic system with a basically new design that allows one to increase the magnetic field and shorten the MOE down to 10.3 mm .
#935 optical isolator how to#
In addition, based on analytical calculations, they explained how to produce a large magnetic field and what were the best arrangements these calculations also provided scaling laws for the dependence of the field as a function of the magnet shape parameters. described two permanent magnet arrangements that could build and produce three kinds of magnetic fields . By adding magnetic conductors in the radially magnetized rings, the magnetic system was capable of achieving a large magnetic field intensity and making the MOE shortened to 9 mm. proposed a FI assembled with the external diameter of 124 mm and the total thickness of 84 mm. When the length of the MOE is reduced, its thermally induced depolarization effect and magnetic field non-uniformity will be reduced, but at the same time a stronger magnetic field needs to be applied to meet the performance requirements of the isolator.Īt present, there have been many studies on enhancing the magnetic field of Faraday isolators. In an FI, the performance of the magneto-optical element(MOE) will affect the polarization of the light, thereby affecting the performance of the isolator .
Faraday isolators(FIs) are passive optical devices that only allow linearly polarized light to pass through in a single direction, ,, and can effectively avoid the influence of back-reflected light on the laser, which makes them widely applied in laser systems. However, during the use of the laser, the optical elements in the optical system will cause light reflection, so that the back-reflected light returns to the laser along the original optical path, which seriously affects the stability of the laser . With the rapid development of information technology, semiconductor laser is widely used in quantum optics ,, , quantum navigation , and quantum precision measurement .
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