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Non-Beam Hazards
Published in Ken Barat, Understanding Laser Accidents, 2018
While one can make up a long list of non-beam concerns, their importance will vary with the work and work environment. An example of this is magnetic safety. First, one may say if I am not working with cryogenic magnetics, or large static magnets then this hazard is of little to no concern. But I have seen individuals injure fingers caught between a screwdriver head and a Faraday Rotator. A Faraday Rotator does present a strong magnetic field at close range. The use of Faraday Rotators might not even make the risk assessment list if one is not familiar with its properties. A Faraday Rotator is a magneto-optic device, where light is transmitted through a transparent medium which is exposed to a magnetic field. The magnetic field lines have approximately the same direction as the beam direction, or the opposite direction. The plane of linearly polarized light is rotated when a magnetic field is applied parallel to the propagation direction (Figure 19.1).
Polarization of Light
Published in Abdul Al-Azzawi, Photonics, 2017
A Faraday rotator is an optical component that rotates the polarization of light due to the Faraday effect. The Faraday rotator works because one polarization of the input light is in ferromagnetic resonance with the material, which causes its phase velocity to be higher than the other. Specifically, given two rays of circularly polarized light, one with left-hand and the other with right-hand polarization, the phase velocity of the one with the polarization in the same sense as the magnetization is greater. In other words, the plane of linearly polarized light is rotated, when a magnetic field is applied parallel to the propagation direction.
Polarization of Light
Published in Abdul Al-Azzawi, Light and Optics, 2018
A Faraday rotator is an optical component that rotates the polarization of light due to the Faraday effect. The Faraday rotator works because one polarization of the input light is in ferromagnetic resonance with the material, which causes its phase velocity to be higher than the other. Specifically, given two rays of circularly polarized light, one with left-hand and the other with righthand polarization, the phase velocity of the one with the polarization in the same sense as the magnetization is greater. In other words, the plane of linearly polarized light is rotated, when a magnetic field is applied parallel to the propagation direction.
High-sensitivity fiber optic magnetic field sensor based on lossy mode resonance and hollow core-offset structure
Published in Instrumentation Science & Technology, 2021
Xue-Peng Jin, Hong-Zhi Sun, Shuo-Wei Jin, Wan-Ming Zhao, Jing-Ren Tang, Chun-Qi Jiang, Qi Wang
Magnetic field sensing has been widely used in biological, medical, military, electrical and other fields. Hence the monitoring of magnetic fields is signficant. Compared with other magnetic field sensors, optical sensors offer small structure, light weight, and no electromagnetic interferences.[1–5] Consequently, a variety of optical fiber magnetic field sensors have been reported, including devices based on magnetostrictive materials[4,6,7] and the Faraday effect.[8] Yang et al.[7] reported a magnetic field sensor based on etched fiber grating on which a thin film of magnetostrictive material was deposited by a sputtering system. Nascimento et al.[8] described an erbium-doped fiber laser that detects an alternating magnetic field by measuring the laser intensity. The sensor consists of two partially overlapping narrow-band fiber Bragg gratings and a section of doped fiber fabricated in the Fabry-Perot interferometer. Sun et al.[6] used a fiber Faraday rotator and a fiber polarizer to form an all fiber optic magnetic field sensor. However, these sensors have limitations that include complex manufacturing processes and high cost.