基于液晶空間光調(diào)制器產(chǎn)生高階拉蓋爾高斯光束及其應(yīng)用
[Abstract]:The higher-order Laguerre Gao Si (LG) beam has the characteristics of orbital angular momentum and annular intensity distribution. The LG beam has a helical phase structure propagating along the axis, and can carry more information. Gravitational wave detection, particle manipulation, optical tweezers, optical wrenches, optical communications and material processing have irreplaceable advantages, and have become a research hotspot in recent years. Therefore, the research on the generation of high-order LG beams with high quality is becoming more and more important. At present, the generation methods of high order LG beam mainly include liquid crystal spatial light modulator, spiral phase slice, cylindrical lens, holographic fork grating, optical diffractive element, etc. Among them, liquid crystal spatial light modulator has wide spatial bandwidth. Because of its high resolution and small pixel size, it can control each pixel in space dynamically and in real time, so it is often used to produce high-order Laguerre Gao Si beam with dynamic control. This paper deals with the generation of high order Laguerre Gao Si beams based on liquid crystal spatial light modulators. The main work is as follows: 1. Liquid crystal spatial light modulator generates high order LG beams. The purity of the generated high-order LG beams is calculated and simulated theoretically, and the phase graph of the higher-order LG mode is compiled based on Matlab. An optical system for producing high order LG beams has been set up experimentally, and LGo,5,LG1,5 and LG3,3 modes have been produced, the purity of which is 83.97 and 74.03and 54.98, respectively. The helical phase information .2. has been verified by interference. Optimization purification of High order LG Beams. The propagation characteristics of spiral LG beam and sinusoidal LG beam in linear mode cleaner and three-mirror mode cleaner are analyzed. It is proved that the three-mirror ring cavity can not output spiral LG beam. The linear mode cleaner is further designed and the LG beam generated by modulation is filtered and purified. The fidelity of the LGo,l mode is 91.5% and the purity of LG mode is improved obviously. 3. The application of high order LG mode to the generation of multimode entangled states in continuous variable space and the phase measurement are discussed. The principle of generating continuous variable overentangled states and four-component polarization entangled states using two kinds of nondegenerate optical parametric oscillators and the potential application of high-order LG mode as pump mode are studied. The principle of high-order LG mode applied to phase measurement is studied.
【學(xué)位授予單位】:山西大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TN761
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