一种同时测量高斯光束束腰位置和半径的新方法

A NEW METHOD FOR SIMULTANEOUSLY MEASURING WAIST POSITION AND WAIST RADIUS OF GAUSSIAN BEAM

从高斯光束的横向光强分布特性出发,建立了小孔光阑透过光功率与高斯光束束腰位置、束腰半径、光阑孔径和光阑位置间的关系式。用氦氖激光器、凸透镜、小孔光阑和硅光电池等搭建了一套简单测量装置,利用此装置对同一小孔光阑在高斯光束传播方向上不同位置时的透过光功率进行了测量。用所得的理论公式对实验数据进行拟合,通过拟合出的参数可同时测得高斯光束的束腰位置和半径。测量结果表明,该方法不仅合理、可行,而且具有装置简单、操作方便等优点。

Based on the transverse light intensity distribution of Gaussian beam,the relationship among the light power,the waist position and the waist radius of Gaussian beam,the aperture of diaphragm and the position of diaphragm was derived.A simple measuring installation was built using a He-Ne laser,a convex lens,a diaphragm and a Silicon Photocell.The light power transmitted out of the diaphragm,which was placed in the different positions along the propagation direction of Gaussian beam respectively,was measured using the measuring installation.The waist position and the waist radius of Gaussian beam were measured simultaneously by fitting the measured data with the derived formula.The results show that the proposed method is not only appropriate and feasible,but also simple and convenient.