高阶贝塞尔光束相干合束特性分析

Investigation on coherent combination characteristics of high-order Bessel beam

为了分析了高阶贝塞尔空心光束的合束特性,比较了不同阵列排布、不同阶数的高阶贝塞尔光束相干和非相干合成时的光强分布,结果表明:当光束在P=1,Q=8的径向排列条件下,贝塞尔光束的阶数N为5~8时,合成光束为类高斯光束;N为9~20时,合成为类贝塞尔光束,光束半径随N增大线性增加。当贝塞尔光束的阶数为12时,随着阵列半径R(0~0.075 m)的增加,合成光束先为类贝塞尔光束,然后为类高斯光束,且类贝塞尔光束半径随R的增大线性下降。这些结果可为空心光束的相干合成提供有益参考。

In order to examine the coherent combination characteristics of the high-order Bessel hollow beams,the intensity distributions of coherent and incoherent combining of high-order Bessel beams with different arrays and different orders are compared. The results show that the combined beam is a Gaussian-like beam when the radial arrangement is P = 1,Q = 8 when the order of Bessel beam N is 5-8. The combined beam is a Bessel-like beam and the beam radius increases linearly with N when N is 9-20. With the increase of the array radius R( 0 ~ 0. 075 m),the combined beam is first a Bessel-like beam which beam radius decreases linearly with the increase of R,and then a Gaussian-like beam when the order of Bessel beam is 12. These results can provide useful references for coherent combination of hollow beams.