Low voltage blue phase liquid crystal for spatial light modulators
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We demonstrated a low-voltage polymer-stabilized blue phase liquid crystal (BPLC) for phase-only modulation with a liquid-crystal-on-silicon (LCoS). A new device configuration was developed, which allows the incident laser beam to traverse the BPLC layer four times before exiting the LCoS. As a result, the 2π phase change voltage is reduced to below 24 V in the visible region. The response time remains relatively fast (∼3 ms). The proposed device configuration enables widespread applications of BPLC spatial light modulators.Keywords:
Spatial light modulator
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Light intensity
We demonstrated a low-voltage polymer-stabilized blue phase liquid crystal (BPLC) for phase-only modulation with a liquid-crystal-on-silicon (LCoS). A new device configuration was developed, which allows the incident laser beam to traverse the BPLC layer four times before exiting the LCoS. As a result, the 2π phase change voltage is reduced to below 24 V in the visible region. The response time remains relatively fast (∼3 ms). The proposed device configuration enables widespread applications of BPLC spatial light modulators.
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We report on a novel transversal beam shaping approach to convert a Gaussian beam to a flat top focus profile by employing a hyperbolic phase function in a liquid crystal on silicon (LCOS) spatial light modulator (SLM). The well-known Powell lens approach is compared to ours. The analytically obtained phase function for the flat top focus conversion problem is compared to our approach theoretically and experimentally. A strategy for the generation of squared and circular top hat foci is derived.
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A new spatial light modulator system based on a high-resolution LCOS micro-display is presented. The parameters like pixel size and number as well as the fill factor and especially the phase modulation properties open up many application in coherent optical applications. The light efficiency of this system can compete with other static optical solutions. A major application field diffractive optics will be illustrated and performance and perspectives of this system will be discussed. Investigations were done mostly on the addressing of the 2.3 Mega pixel device. The effect of ghost images and cross talk due to the addressing scheme will be discussed concerning the influence of the optical performance. General optical measurements like complex modulation is presented, particularly focused on the phase modulation properties. Furthermore, possibilities of adapting the modulation by the use of "Gamma-correction" curves are shown. Various experiments which illustrate different application fields the modulator system are presented.
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We propose a multiple input and multiple output wavelength selective switch (MxN WSS) with an optical configuration that uses a single diffractive optics deflector. In the proposed WSS, broadcast-and-select functionality is achieved by multi-angle diffraction and control of diffraction angle using the phase modulation patterns on a spatial light modulator such as liquid crystal on silicon (LCOS). The experimental results show that a 5×5 WSS using the spatial modulation patterns designed using the computer-generated hologram (CGH) technique works well.
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This paper discusses the characteristics of phase-only modulation using a reflec tive liquid crystal on silicon(LCOS). The 2×2 Jones matrix method is used as a computational tool to theoretically analyze phase modulation characteristics. Th e system has been constructed for testing of amplitude and phase, in which a He- Ne laser as the light source, testing the wave front phase using an interferomet er. The LCOS displays as a liquid crystal spatial light modulator and its drivin g circuit is controlled by a computer, digital data are sampled by CCD. We have tested the phase modulation of 1024×768 LCOS displays. Given the state of input and output polarizations ,the result of testing our theories by experiment sho w consistency ,so LCOS displays can be used as phase-only modulator.
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Nondiffracting beams are of interest for optical metrology applications because the size of the beam does not change as the beam propagates. However, accuracy can be increased if the diameter of the beam is smaller. One technique for accomplishing this is to use the dark axial intensity profile associated with a higher-order nondiffracting Bessel function beam. We generate these higher-order Bessel function beams with a programmable spatial light modulator. We study the intensity patterns and the phase dependence of these nondiffracting beams. In addition, we examine interference effects caused by recording these patterns onto a binary spatial light modulator.
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We investigate output mode purities of Laguerre-Gaussian (LG) beams generated from four typical simultaneous amplitude and phase modulation methods with phase-only spatial light modulators (SLMs). Numerical simulations supposing the practical SLM, i.e., stepwise phase modulation with a pixelated device, predict an output mode purity of beyond 0.969 for the LG beams of less than radially and azimuthally fifth order. Experimental results of generating LG beams are also shown to demonstrate the effects of the simultaneous phase and amplitude modulation.
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Spatial light modulator
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