雷射廣泛應用於各個領域，近年來雷射需求逐年上升，相關產業對雷射品質的要求逐漸提高，各家廠商為改善雷射品質提出許多不同方案，有些針對電源輸入，有些則透過外在補償的方式進行改善。雷射本身存在四自由度擾動，包含二自由度的平移以及二自由度的偏轉擾動，許多研究指出雷射會因為溫度、空氣流動等等外在因素影響其穩定性，電源的輸入功率也會影響雷射擾動的程度。
為降低雷射四自由度擾動的問題，目前市面上其中一種最常見的產品為快速反射鏡，快速反射鏡由一個平面鏡以及一組二自由度的致動器所構成，致動器提供二自由度的角度偏轉帶動反射鏡運動，進而控制雷射方向。而雷射總共有四自由度的擾動，所以在使用時需要搭配兩組快速反射鏡才能完整地補償。
本論文使用SolidWorks設計繪圖並使用MATLAB與有限元素分析軟體ANSYS模擬，最終設計出一款具降低雷射擾動功能的四自由度音圈馬達。四自由度音圈馬達搭配實驗室設計之鏡組替代市售的快速反射鏡，縮短雷射補償系統的整體光路。在圈馬達內部設置一個直流有刷馬達，並安裝光學元件擴散片於有刷馬達上與其一同旋轉。在四自由度音圈馬達作動進行雷射四自由度擾動補償的時候，旋轉的擴散片可以同時抑制雷射光斑的產生，提升雷射光源品質。

Laser is widely used in various fields. In recent years, the demand of laser has increased year by year. Related industries have gradually increased their requirements for laser quality. Various manufacturers have proposed many different solutions to improve the quality of laser.
Laser has 4-DOF fluctuations, including 2 translational fluctuations and 2 angular fluctuations. Several studies have pointed out that the stability of laser is affected by temperature, air flow, and the input power of the power supply.
In order to reduce the fluctuations of laser, one of the most common products on the market is the Fast Steering Mirror (FSM). FSM is composed of a flat mirror and a set of 2-DOF actuator. Actuator drives the mirror controlling the direction of laser. Although, laser has total 4-DOF fluctuations, so two sets of FSMs are needed.
In this thesis, a 4-DOF Voice Coil Motor (VCM) with function of reducing laser geometrical fluctuations had been designed by using the CAD software SolidWorks and simulated by utilizing MATLAB and finite element analysis software ANSYS. The 4-DOF VCM is combined with a laboratory-designed mirror set to replace the commercial FSM. Shorten the overall optical path of the laser compensation system. A DC brushed motor is arranged inside the VCM, and the optical element diffuser is installed on the brushed motor rotating with it. When the 4-DOF VCM is actuated for laser compensation, the rotating diffuser can simultaneously suppress the generation of laser speckle improving the quality of laser.

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