Computer-generated holograms with optimum bandwidths obtained with twisted-nematic liquid-crystal displays

Abstract

We discuss a computer-generated hologram for encoding arbitrary complex modulation based on a commercial twisted-nematic liquid-crystal display. This hologram is implemented with the constrained complex modulation provided by the display in a phase-mostly configuration. The hologram structure and transmittance are determined to obtain on-axis signal reconstruction, maximum bandwidth, optimum efficiency, and high signal-to-noise ratio. We employed the proposed holographic code for the experimental synthesis of first-order Bessel beams.

Reconfigurable beams with arbitrary polarization and shape distributions at a given plane

“…Arrizón developed a cell-based holographic algorithm for encoding complex optical signals in SLMs with arbitrary amplitude and phase distributions [19]. Here, we briefly summarize the steps required to generate holograms able to shape the amplitude and the phase of the wavefront.…”

“…Our approach is based on a Mach-Zehnder setup combined with a translucent SLM in each path of the interferometer [17]. The transverse components of the incident light beam are processed independently and modified by means of specifically designed holograms calculated using a procedure derived from Arrizón's method to encode complex signals [18,19]. The processed transverse components are recombined and imaged on a CCD camera.…”

Complex Fresnel hologram display using a single SLM

“…Unfortunately, current SLMs can modulate either phase or intensity of an incident light, but not both [11,12]. Some methods are proposed to alleviate the practical limitation in modulation [13][14][15][16][17][18][19][20][21]. But, in these methods, the holograms need to be recalculated to match the specific display systems.…”

A digital holography technique for generating beams with arbitrary polarization and shape

“…In particular, the holograms have been calculated by means of an algorithm derived from Arrizon's method to encode complex optical signals using phase-mostly SLMs. [8][9][10] This approach entitles us to encode any polarization state in each point of the wavefront even when the displays used are not able to modulate the phase from 0 to 2π and present amplitude coupling. Additionally, the amplitude of the wavefront may also be modeled so as to obtain a particular shape.…”