阵列光束的偏振方向对其相干合成远场光强分布的影响

Effect of Polarization of Array Beams on the Far Field Irradiance Distribution of Coherent Combining

理论推导了线偏振光纤激光器阵列相干合成远场光强分布的表达式,详细研究了激光器的偏振方向对相干合成远场图样分布、中心主瓣的角宽度以及相干合成远场条纹可见度的影响。阵列光束偏振方向的不一致会使相干合成远场光强的峰值功率下降,中心主瓣的宽度增加,远场光强分布有本底漂移,远场条纹可见度下降。

The equation of the far-field intensity distribution is deduced in coherent combining of line polarization fiber laser arrays and the influence of polarization of lasers is investigated on the far-field patterns,the energy and angular width of the main lobe and the visibility in interference patterns.The difference polarization of the laser array reduce the far-field peak power of coherent beams on axis,the width of the central lobe is wider.The far-field intensity pattern have a constant-intensity pedestal,the visibility in interference patterns is lower.