光束的轴向扫描在光学三维成像、光学材料制造等领域中具有十分广泛的应用。然而, 现有的光束轴向扫描方法均存在着各自的不足, 或是扫描速度过慢, 或是扫描范围有限, 又或是会影响生物样品的活性。文中基于光斑操控理论, 通过对照明光束进行相位编码, 改变相应的聚焦光斑轴向位置, 实现光束的轴向扫描。通过模拟计算, 验证了方法的可行性。模拟结果表明, 本扫描方法具有较好的线性度, 线性拟合因子R2=0.993 9。由于该方法不涉及机械移动, 因此具有扫描精度高, 对生物样品影响小等优点, 有潜力在相关科研领域得到很好的应用。

Beam axial scanning has been widely applied in the fields of three-dimensional optical imaging and optical material production. However, the existing beam axial scanning methods all have their own drawbacks such as low scanning speed, limited scanning range and damage on the activity of biological samples. Based on focal spot manipulation theory and through performing illumination beam phase encoding, the relative axial position of the focal spot is changed to realize beam axial scanning. The feasibility of the method is verified through simulation calculation. Simulation results show that the scanning method has better linearity and linear fitting factor R2 is 0.993 9. Without mechanical movement, the method has high scanning accuracy, little influence on biological samples, and has potential ability to be well applied in the area of related scientific researches.