DMD-based pure-phase superpixel method for digital holography

In this work, we implement a pure-phase superpixel (PPSP) method with a digital micromirror device (DMD). Here the DMD acts in an unconventional mode, i.e. as a phase-only modulator with hundreds of phase levels. An iterative Fourier transform algorithm is adapted to the DMD with high quality in a 2f-configuration without filters. When using 1600 x 1600 DMD pixels, the simulations show that the PPSP method in combination with the mixed-region amplitude freedom algorithm reduces the root-mean-square error by at least 33.5% compared with the conventional amplitude and phase modulation methods, and provides higher efficiency by 7.3%.

Automated summary

In this study, a pure-phase superpixel (PPSP) method using a digital micromirror device (DMD) is implemented. The DMD operates in an unconventional mode as a phase-only modulator with multiple phase levels. An iterative Fourier transform algorithm is applied to the DMD in a 2f-configuration without filters, achieving high-quality adaptation. Simulation results demonstrate that when using 1600 x 1600 DMD pixels, the PPSP method combined with the mixed-region amplitude freedom algorithm reduces the root-mean-square error by at least 33.5% compared to conventional amplitude and phase modulation methods, while providing a 7.3% improvement in efficiency.