Laser-phased-array system provides an elegant means for achieving the inertial-free, high-resolution, rapid and random
beam steering. In laser-phased-array system, phase controlling is the most important factor that impacts the system
performance. A novel scheme is provided in this paper, the beam steering is accomplished by using crystal fiber array,
the difference length between adjacent fiber is fixed. The phase difference between adjacent fiber decides the direction of
the output beam. When the wavelength of the input fiber laser is tuned, the phase difference between the adjacent
elements has changed. Therefore, the laser beam direction has changed and the beam steering has been accomplished. In
this article, based on the proposed scheme, the steering angle of the laser beam is calculated and analyzed theoretically.
Moreover, the far-field steering beam quality is discussed.
As we all known that laser-phased-array system can provide an excellent means for achieving random beam steering. In
this paper the crystal of the Lithium Niobate (LiNbO3) will be used as the phase shifter to change the phase. According
to the parameter of LiNbO3 the relationship is presented between the control voltage that loaded on LiNbO3 and phase
modulation. Then, on the basis of the far field coherent combination, the relationship between the control voltage and the
steering angle of the laser beam will be obtained. The numerical results are presented and have verified the theoretical
analysis.
This paper introduces the working principle of Fibre Microscope and Metallographic Microscope, and their mutual calibration method. The calibration method is reasonable and easy to operate. Metallographic Microscope is widely used in metallurgy, manufacture, science and technology fields, and so on, for measuring the grain size of Austenite of metal material and the depth of Carburized layer after the heat treatment of the material. Fiber Microscope mostly measures the diameter, cross section and section acreage of all kinds of fibers. The key of the paper is to choose the best source of quantity values and the corresponding instrument. The quantity values of Fibre Microscope and Metallographic Microscope are traceable to the national standard. Moreover, the choice of suitable instrument can guarantee the quality control of the manufacturers.
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