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以在大尺寸复合薄片上获得较好的泵浦均匀性和较高的吸收效率为目的,对泵浦分布进行了理论分析。计算表明,阵列距离27mm、晶体半径11mm和吸收系数0.13mm可获得较好的泵浦均匀性和较高的吸收效率。计算了由温度分布和应变分布造成的相位畸变,总泵浦功率为700W时的相位畸变为0.523μm,总泵浦功率为3024W时的相位畸变为2.258μm。明显小于其它文献中理论计算和实验测量的相位畸变。在较小泵浦功率下对相位畸变进行了初步的实验测量,实验测量结果与理论计算基本一致。该技术可向更大功率扩展。
For the purpose of obtaining better pump uniformity and higher absorption efficiency on large-size composite sheets, the theoretical analysis of pump distribution is carried out. Calculations show that the array has a distance of 27mm, a crystal radius of 11mm and an absorption coefficient of 0.13mm to obtain better pump uniformity and higher absorption efficiency. The phase distortion caused by temperature distribution and strain distribution was calculated. The phase distortion was 0.523μm when the total pump power was 700W and the phase distortion was 2.258μm when the total pump power was 3024W. Obviously smaller than the theoretical calculations and experimental measurements of phase distortion in other literature. Under the condition of small pump power, a preliminary experimental measurement of phase distortion was carried out. The experimental measurement results are basically consistent with the theoretical calculation. The technology can be expanded to more powerful.