Spiking voltages for faster switching of nematic liquid-crystal light modulators

Xun, Xiaodong; Cho, Doo Jin; Cohn, Robert W.

doi:10.1364/ao.45.003136

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…4) The speed of the SLM: the speed at which the pixels can be driven to a new voltage setting (refresh rate of the driving electronics) as well as adopt a new voltage setting (liquid crystal settling time, i.e. the time for the liquid crystals to reorient to the newly applied voltage) will together dictate the rate at which new diffraction patterns can be focused on the sample [134][135][136][137][138] , which in combination with exposure durations (see opsin sensitivity) will dictate the speed at which sequences of activity can be 'played in'. Recent work simultaneously engineering opsins with faster kinetics and SLMs with more rapid refresh rates is yielding promising advances that are directly applicable in all-optical interrogation 37 .…”

Section: Patterned Illumination Devicementioning

confidence: 99%

All-optical interrogation of neural circuits in behaving mice

et al. 2022

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Recent advances combining two-photon calcium imaging and two-photon optogenetics with computer generated holography now allow us to read and write the activity of large populations of neurons in vivo at cellular resolution and with high temporal resolution. Such "all-optical" techniques enable experimenters to probe the impact of functionally defined neurons on neural circuit function and behavioural output with new levels of precision. This greatly increases the flexibility, resolution, targeting specificity and throughput compared with alternative approaches based on electrophysiology and/or one-photon optogenetics, and can interrogate larger and more densely labelled populations of neurons than current voltage imaging-based implementations. This protocol describes the experimental workflow for all-optical

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Section: Patterned Illumination Devicementioning

confidence: 99%

All-optical interrogation of neural circuits in behaving mice

et al. 2022

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“…There are two key components. The first is the well-known overdrive method [6][7][8], which is related to the transient nematic ef-fect [9]. We demonstrate here a successful implementation of a real-time multi-frame overdrive method.…”

Section: Introductionmentioning

confidence: 95%

“…Fully exploiting the high update rate of the SLM results in a significant improvement compared to previous approaches [7,8], which used only a single phase pattern to speed up the transition of an SLM. This additional pattern is displayed for a fixed period of time corresponding to the longest expected transition time (for a phase difference of 2π).…”

Section: Slm Control Hardware and Softwarementioning

confidence: 99%

Speeding up liquid crystal SLMs using overdrive with phase change reduction

Thalhammer¹,

Bowman²,

Love³

et al. 2013

Opt. Express

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Nematic liquid crystal spatial light modulators (SLMs) with fast switching times and high diffraction efficiency are important to various applications ranging from optical beam steering and adaptive optics to optical tweezers. Here we demonstrate the great benefits that can be derived in terms of speed enhancement without loss of diffraction efficiency from two mutually compatible approaches. The first technique involves the idea of overdrive, that is the calculation of intermediate patterns to speed up the transition to the target phase pattern. The second concerns optimization of the target pattern to reduce the required phase change applied to each pixel, which in addition leads to a substantial reduction of variations in the intensity of the diffracted light during the transition. When these methods are applied together, we observe transition times for the diffracted light fields of about 1 ms, which represents up to a tenfold improvement over current approaches. We experimentally demonstrate the improvements of the approach for applications such as holographic image projection, beam steering and switching, and real-time control loops.

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“…Since then, domestic and international scholars have carried out a lot of research on overdriving technology. For the liquid crystal display, the switching speed for the Boulder Nonlinear systems 512 × 512 pixel SLM filled with nematic liquid crystal for visible wavelengths is less than 100 ms [14]. In 2006, Xiaodong Xun applied overdriving technology to reduce the rising response time from 340 ms to 67 ms and the falling time from 420 ms to 98 ms successfully [14].…”

Section: Introductionmentioning

confidence: 99%

“…For the liquid crystal display, the switching speed for the Boulder Nonlinear systems 512 × 512 pixel SLM filled with nematic liquid crystal for visible wavelengths is less than 100 ms [14]. In 2006, Xiaodong Xun applied overdriving technology to reduce the rising response time from 340 ms to 67 ms and the falling time from 420 ms to 98 ms successfully [14]. In 2013, the Graphics Processing Unit (GPU) was used to overdrive the liquid crystal in the adaptive optics, which had produced the rapid correction of far-field distortion spots [15].…”

Section: Introductionmentioning

confidence: 99%

Line of Sight Correction of High-Speed Liquid Crystal Using Overdriving Technology

Guo

et al. 2020

Electronics

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In the line of sight correction system, the response time of the liquid crystal spatial light modulator under the normal driving voltage is too long to affect system performance. On the issues, an overdriving method based on a Field-Programmable Gate Array (FPGA) is established. The principle of the overdrive is to use a higher voltage difference to achieve a faster response speed of liquid crystal. In this scheme, the overdriving look-up table is used to seek the response time of the quantized phase, and the liquid crystal electrode is driven by Pulse–Width Modulation (PWM). All the processes are performed in FPGA, which releases the central processing unit (CPU) memory and responds faster. Adequate simulations and experiments are introduced to demonstrate the proposed method. The overdriving experiment shows that the rising response time is reduced from 530 ms to 34 ms, and the falling time is from 360 ms to 38 ms under the overdriving voltage. Typical light tracks are imitated to evaluate the performance of the line of sight correction platform. Results show that using the overdrive the −3 dB rejection frequency was increased from 1.1 Hz to 2.6 Hz. The suppression ability of the overdrive is about −20 dB at 0.1 Hz, however the normal-driving suppression ability is only about −13 dB.

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Spiking voltages for faster switching of nematic liquid-crystal light modulators

Cited by 11 publications

References 8 publications

All-optical interrogation of neural circuits in behaving mice

All-optical interrogation of neural circuits in behaving mice

Speeding up liquid crystal SLMs using overdrive with phase change reduction

Line of Sight Correction of High-Speed Liquid Crystal Using Overdriving Technology

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