Modal liquid crystal wavefront corrector

Котова, С. П.; Kvashnin, M Yu; Rakhmatulin, M. A.; Zayakin, Oleg A.; Guralnik, Igor R.; Klimov, N. A.; Clark, Paul; Love, Gordon D.; Naumov, A. N.; Saunter, Christopher D.; Loktev, Mikhail; Vdovin, Gleb; Toporkova, Luba V.

doi:10.1364/oe.10.001258

Cited by 41 publications

(16 citation statements)

References 18 publications

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“…Although the influence function of this device shows no dependence on frequency, in a general way the behavior of the device is similar to that of the voltage-divider-based LC-MWC described in [10,11,12]. In particular the thick-dielectric-based LC-MWC can be controlled with two degrees of freedom per actuator.…”

Section: Discussionmentioning

confidence: 66%

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Liquid crystal wavefront corrector with modal response based on spreading of the electric field in a dielectric material

Loktev¹,

Vdovin²,

Klimov³

et al. 2007

Opt. Express

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A novel liquid crystal (LC) wavefront corrector with smooth modal influence functions is proposed and realized. The device consists of a thin layer of planar aligned nematic LC sandwiched between a glass plate with a conductive electrode and a plate made of ceramic material with a very high dielectric constant. Control electrodes are positioned on the back side of the ceramic plate, opposite to the LC. The modal character of the response is determined by spreading of the electric field in the ceramic plate. The device implemented is operating in a reflective (mirror) mode; however, similar principles can be used to build a transmissive device. Low cost and simplicity of control make it a good alternative to continuous face-sheet deformable mirrors.

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Section: Discussionmentioning

confidence: 66%

“…Earlier, it was proposed to implement a modal-type liquid crystal wavefront corrector using a continuous high-resistance electrode as a distributed voltage divider with point-like actuators connected to it [10,11]. The unique feature of this modal corrector is the potential to operate with several degrees of freedom per actuator.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal wavefront corrector with modal response based on spreading of the electric field in a dielectric material

Loktev¹,

Vdovin²,

Klimov³

et al. 2007

Opt. Express

View full text Add to dashboard Cite

show abstract

“…In the current prototype, a single-channel RF AM analog control is implemented which allows correction of defocus and spherical aberration. The configurations of the LC modal phase corrector, analogous to those described in [35] and [36], can be used for the multi-channel adaptive lens. Such multi-channel systems can successfully correct asymmetric aberrations.…”

Section: Discussion and Further Workmentioning

confidence: 99%

Liquid-crystal intraocular adaptive lens with wireless control

Simonov¹,

Vdovin²,

Loktev³

2007

Opt. Express

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We present a prototype of an adaptive intraocular lens based on a modal liquid-crystal spatial phase modulator with wireless control. The modal corrector consists of a nematic liquid-crystal layer sandwiched between two glass substrates with transparent low-and high-ohmic electrodes, respectively. Adaptive correction of ocular aberrations is achieved by changing the amplitude and the frequency of the applied control voltage. The convex-shaped glass substrates provide the required initial focusing power of the lens. A loop antenna mounded on the rim of the lens delivers an amplitude-modulated radio-frequency control signal to the integrated rectifier circuit that drives the liquid-crystal modal corrector. In vitro measurements of a 5-mm clear aperture prototype with an initial focusing power of +12.5 diopter, remotely driven by a radio-frequency control unit at ~6 MHz, were carried out using a Shack-Hartmann wavefront sensor. The lens based on a 40-μm thick liquid-crystal layer allows for an adjustable defocus of 4 waves, i. e. an accommodation of ~2.51 dioptres at a wavelength of 534 nm, and correction of spherical aberration coefficient ranging from -0.8 to 0.67 waves. Frequency-switching technique was employed to increase the response speed and eliminate transient overshoots in aberration coefficients. The full-scale settling time of the adaptive modal corrector was measured to be ~4 s.

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“…Fig.3a shows response of the central contact, and combined response of several contacts is shown in Fig.3b. More experimental results can be found in [5] and [6]. Analysis of the operation modes of LC-MWC and its residual aberrations is presented in [7].…”

Section: Modal Corrector Based On a Resistive Layermentioning

confidence: 99%

Modal wavefront correction with liquid crystals: different options

Loktev

Vdovin

Klimov³

et al. 2005

SPIE Proceedings

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Liquid crystal (LC) wavefront correctors with modal addressing are described. Three different approaches are considered. The first one is based on a continuous thin-film resistive layer. This layer is used for forming of the local voltage profile that controls the phase distribution across the corrector's aperture. The second approach is a modification of the first one, where the continuous resistive coating is replaced by a network of discrete resistors. It is based on silicon technology. The third approach makes use of distributed electric field in thick dielectric layers for forming of the modal response of an actuator. Technologies, methods of control and experimental results are discussed for each case.

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Modal liquid crystal wavefront corrector

Cited by 41 publications

References 18 publications

Liquid crystal wavefront corrector with modal response based on spreading of the electric field in a dielectric material

Liquid crystal wavefront corrector with modal response based on spreading of the electric field in a dielectric material

Liquid-crystal intraocular adaptive lens with wireless control

Modal wavefront correction with liquid crystals: different options

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