Abstract
The bunching and deflection characteristics of low-power laser beam were investigated under electromagnetic field. On the basis of the Faraday effect, the cylindrical electromagnetic cavity was designed and implemented in the experiments. Several types of the magneto-optical elements were placed in the electromagnetic cavity individually. In the test of the deflection characteristics of low-power laser, the rotating angle, the polarization plane of linearly polarized light which passed through electromagnetic cavity, was measured by polarization extinction. We focus on the relation between the coil current and the rotating angle. The experimental data show that when the coil current varies in the range of 0–5 A, the rotating angles changed from 0° to 24.1°. Then, a fitting formula about the coil current and the rotating angle was obtained from the experimental data using the least square algorithm. The analysis shows that the rotating angle is proportional to the excitation current and the correlation coefficient is more than 0.9995. In order to study the beam bunching characteristics of low-power laser, the area of the laser facula was measured after the low-power laser passed through the electromagnetic cavity. The experiment data show that the laser facula area changes in a small range and the experimental data meet 3σ criteria.
Highlights
Lasers have been widely used in the fields of industrial manufacture, medical, and communications applications
We find that when the laser beam is directly irradiated on the photosensitive surface of the industrial camera, the photosensitive element will go beyond the linear region and become saturated, and the laser facula area cannot be measured accurately
We study the effect of excitation current on the magnetic flux density at the midpoint of the electromagnetic cavity
Summary
Lasers have been widely used in the fields of industrial manufacture, medical, and communications applications. Magneto-optical glass is a good candidate for application for multiple components (optical isolators, circulators, fiber switch, and so on) in fiber communication systems and high-power laser systems, owing to its outstanding optical performances.. The laser with smaller divergence angle is more suitable for long distance transmission in the satellite laser communication system (SLCS). There are many researches on the improvement of laser performance parameters recently, these confine to the adjustment of auxiliary optical devices in the laser structure. Along with the people to improve the performance requirements of the laser beam, especially the strong demand of the highbeam laser beam, research method of poly laser has been extremely urgent. The emission angle of high-precision laser is less than 0.1 mrad.. The performance of this laser still cannot meet the requirements of long distance and high-precision measurement system The emission angle of high-precision laser is less than 0.1 mrad. the performance of this laser still cannot meet the requirements of long distance and high-precision measurement system
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