Nondiffracting beams are of interest for optical potential applications owing to their properties of smaller central spot,
longer propagation distance and so on. A phase-holograms-based method of generation of nondiffracting beams array
with arbitrary order is proposed in this paper. If a phase hologram is displayed on a phase-only spatial light modulator
(SLM), when a collimated monochromatic plane wave illuminates it, an annulus with high concentration of energy is
obtained in the Fourier plane. Then through the Fourier transform again, a nondiffracting beam will be generated. It is
able to generate arbitrary order nondiffracting beams with high diffractive efficiency. More significantly, if a phasehologram-
array that possesses the same eigenvalue is utilized, a unique bright annulus will be generated in the Fourier
plane because of the shift-invariance of Fourier transform and the consistency of phase hologram design. Then through
the Fourier transform again, a nondiffracting beams array will be generated. Furthermore, the location and the order of
each individual nondiffracting beam can be customized according requirement. Experiment results are in good
agreement with the numerical simulation and the theoretical analysis.
In this paper, a method of measuring the phase modulation properties of spatial light modulator (SLM) by heterodyne
interferometry is proposed. As a kind of key elements in the advanced optical information processing systems, spatial
light modulators is widely used in many important fields, especially used as a dynamic phase modulating device. So, the
phase calibration plays an important role in the SLM applications. Compared with the methods based on traditional
interferometry, this method measures the phase response directly by taking advantage of the heterodyne mechanism, so it
leads to higher accuracy. A heterodyne-interferometer based calibration system making use of acousto-optic frequencyshifters
has been designed and realized. Theoretical analysis and experimental results demonstrate the validity of this
method.
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