文章研究了非理想光束对平衡零拍微小平移测量的影响,计算了两种情况下的信噪比:(1)本底光偏离TEM10模的情况;(2)信号光偏离TEM00模的情况。结果表明只有少数模式对测量结果有影响。情况(1)中测量噪声增加了,而情况(2)中噪声模式的正交分量被扭曲了。
The impact of the non-ideal beam on tiny displacement balanced homodyne measurement was studied. And calculated The singal to noise ratio of two cases. (1)The local deviate TEM10 mode (2)The signal deviate TEM00 mode. The results showed that only a few modes impact the measurement. For (1) condition the noise for measurement increased,for (2) condition the orthogonal component of noise is dis- torted.