Topic
Spatial light modulator
About: Spatial light modulator is a research topic. Over the lifetime, 9043 publications have been published within this topic receiving 130143 citations.
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TL;DR: By using a transmission matrix inversion method to achieve focusing, within a limited field of view and under a low noise condition in transmission matrix measurements, the PBR of the focus can be higher than that achieved by conventional methods such as optical phase conjugation or feedback-based wavefront shaping.
Abstract: Focusing light through scattering media has broad applications in optical imaging, manipulation and therapy. The contrast of the focus can be quantified by peak-to-background intensity ratio (PBR). Here, we theoretically and numerically show that by using a transmission matrix inversion method to achieve focusing, within a limited field of view and under a low noise condition in transmission matrix measurements, the PBR of the focus can be higher than that achieved by conventional methods such as optical phase conjugation or feedback-based wavefront shaping. Experimentally, using a phase-modulation spatial light modulator, we increase the PBR by 66% over that achieved by conventional methods based on phase conjugation. In addition, we demonstrate that, within a limited field of view and under a low noise condition in transmission matrix measurements, our matrix inversion method enables light focusing to multiple foci with greater fidelity than those of conventional methods.
44 citations
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TL;DR: This work shapes a single-lobe PSF that rotates upon defocus for each polarisation channel and combines the two polarisation channels with a relative 180° phase-shift on the computer, merging them into a singlePSF that exhibits two lobes whose orientation contains information about the axial position.
Abstract: We present an approach for point spread function (PSF) engineering that allows one to shape the optical wavefront independently in both polarisation directions, with two adjacent phase masks displayed on a single liquid-crystal spatial light modulator (LC-SLM). The set-up employs a polarising beam splitter and a geometric image rotator to rectify and process both polarisation directions detected by the camera. We shape a single-lobe (“corkscrew”) PSF that rotates upon defocus for each polarisation channel and combine the two polarisation channels with a relative 180° phase-shift on the computer, merging them into a single PSF that exhibits two lobes whose orientation contains information about the axial position. A major advantage lies in the possibility to measure and eliminate the aberrations in the two polarisation channels independently. We demonstrate axial super-localisation of isotropically emitting fluorescent nanoparticles. Our implementation of the single-lobe PSFs follows the method proposed by Prasad [Opt. Lett.38, 585 (2013)], and thus is to the best of our knowledge the first experimental realisation of this suggestion. For comparison we also study an approach with a rotating double-helix PSFs (in only one polarisation channel) and ascertain the trade-off between localisation precision and axial working range.
44 citations
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14 Sep 1998TL;DR: In this paper, the duty cycle of the bit-plane display times is shortened relative to the frame period to avoid visual artifacts, which can be accompanied by a shortening of the duty time of the illumination on SLM.
Abstract: Methods of controlling the illumination source ( 18 ) of an SLM-based display system ( 10 ). It is assumed that the system ( 10 ) displays pixel data formatted into a bit-plane format so that all bits of the same bit-weight can be displayed simultaneously. To provide greyscale, the amplitude of the source ( 18 ) may be modulated so that bit-planes having greater bit-weights are displayed with more intense illumination than bit-planes having smaller bit-weights (FIGS. 2 and 3 ). To avoid visual artifacts, the duty cycle of the bit-plane display times may be shortened relative to the frame period. (FIG. 4 A). The latter method can be accompanied by a shortening of the duty time of the illumination on SLM ( 15 ). (FIG. 4 B). The short duty cycle method may be used together with illumination amplitude modulation, or it may be used with the PWM method of providing greyscale.
43 citations
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11 Oct 2001
TL;DR: In this paper, a simple optical system for recording/reproducing information is structured without decreasing the amount of information, and the interference pattern formed by the interference between the information light beam and the recording reference light beam is recorded in an information recording layer cubically.
Abstract: A beam of light is spatially modulated according to the information to be recorded by a spatial light modulator (27) to generate an information light beam. The information light beam is focused by an objective (21) onto an optical information recording medium (1) in such a way that the diameter of the light beam is the smallest at the boundary between a transparent substrate (2) and a protective layer (5). A recording reference light beam is focused by an objective (31) onto the optical information recording medium (1) in such a way that the diameter of the light beam is the smallest at the boundary between the transparent substrate (2) and the protective layer (5). The interference pattern formed by the interference between the information light beam and the recording reference light beam is recorded in an information-recording layer (3) cubically. Thus a simple optical system for recording/reproducing information is structured without decreasing the amount of information.
43 citations
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27 Jan 2005TL;DR: In this paper, a hologram recording device is provided with a plurality of optical elements (20p, 20p’) which can be in two statuses, i.e., in on-mode where the reference beam is transmitted or reflected in a prescribed direction toward the HMD, and in off-mode when the reference beacon is guided outside the prescribed direction or blocked.
Abstract: A hologram recording device records hologram in a hologram recording medium by splitting a coherent beam outputted from a beam source into a signal beam and a reference beam, irradiating the hologram recording medium with the signal beam by modulating the signal beam by a spatial light modulator, and by irradiating the hologram recording medium with the other reference beam to have the reference beam overlap the signal beam. The hologram recording device is provided with a plurality of optical elements (20p, 20p’) which can be in two statuses, i.e., in on-mode wherein the reference beam is transmitted or reflected in a prescribed direction toward the hologram recording medium, and in off-mode where the reference beam is guided outside the prescribed direction or blocked. Each of the optical elements (20p, 20p’) is provided with an optical phase modulating means which generates prescribed phase differences (0, π), and a phase modulation control means which controls each of the optical elements (20p, 20p’) to be in the on-mode or off-mode and modulates the reference beam to a beam having a prescribed phase pattern.
43 citations