Laser beam quality diagnosis with radial shearing interferometry

Beam quality measurement is very important for high power laser facility. It ensures the facility work in a safe state and offers parameters to beam control system at the same time .Using radial shearing interferometer (RSI) based on spatial phase modulation combined diagnostic phase, near field and far field in experiment. It is found that this method can get high spatial resolution phase information, and that the power in bucket (PIB) curve of far field measured by RSI agrees very well with that by CCD. The only problem is that high resolution near field can't be obtained with RSI now.