Spatial and temporal stabilization of holographically-shaped beam with the Fourier space intensity measurement

Holographic beam shaping that is performed with a computer-generated hologram displayed on a spatial light modulator is very useful for many kinds of scientific and engineered applications. The temporal and spatial stabilization is indispensable for them, especially, for the material laser processing, because it requires a high-quality beam in short and long terms. In our research, the stabilization is performed with an observation of the intensity distribution that is easily detected by simple optics and an ordinary imager. The reconstruction of the computer-generated hologram is iteratively optimized according to the holographic reconstruction on the Fourier space. The performance of the beam shaping is estimated under the application of laser processing of glass.