Transfer characteristics of the microchannel spatial light modulator

Hara, Tsutomu; Ooi, Yoshiharu; Suzuki, Yoshiji; Wu, M.

doi:10.1364/ao.28.004781

Cited by 29 publications

(6 citation statements)

References 7 publications

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“…The requirement for multiple passive gratings or SLMs in detection significantly impacts the receiver's cost and physical footprint, complicating transport and receive alignment. [169][170][171][172][173][174][175] Based on this situation, we prototype a detection mechanism with active control that is capable of adapting to changing environmental parameters (including salinity, temperature, and turbulence) within a compact form factor. [176][177][178][179][180][181][182][183] Our research presents an innovative approach towards optimizing system robustness by utilizing optical machine learning hardware within the backend demultiplexing stage, preceding the high-speed camera as shown in Fig.…”

Section: Multiplexed Oam Generation and Detectionmentioning

confidence: 99%

Demultiplexing OAM beams via Fourier optical convolutional neural network

Ye,

Kang,

Wang

et al. 2023

Laser Beam Shaping XXIII

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Here we present an innovative free-space optical (FSO) communication system which is capable of training database in real-time and demultiplex multiplexed spatial structured laser beams such as orbital angular momentum (OAM) beams under varying atmospheric turbulent conditions. The core part of our detection system is heterogeneous convolutional neural network includes an optical 4f system using first Fourier convolution neural network layer driven by kilohertz-fast reprogrammable high-resolution digital micromirror devices (DMDs). This optical-filtering-based convolutional neural network is utilized to realize the training and demultiplexing 4-bit OAM-coded beams under simulated turbulent condition using modified von K´arm´an atmospheric model. The current implementation shows classification accuracy of 89.35% (under weak turbulence) and 38.26% (under strong turbulence).

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Section: Multiplexed Oam Generation and Detectionmentioning

confidence: 99%

Demultiplexing OAM beams via Fourier optical convolutional neural network

Ye,

Kang,

Wang

et al. 2023

Laser Beam Shaping XXIII

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show abstract

“…Considering candidate phase shifters, spatial light modulators (SLMs), such as Pockels Readout Modulators (PROM) [15], microchannel SLMs [16], light valves that use KD 2 PO 4 crystals and Fabry-Perot modulators [17] offer very high resolution [18], however require control voltages in the kV range and have slow responses (hundreds of ms) [16]. On the other hand, Lithium Niobate (LiNbO 3 ) phase modulators have bandwidths that exceed 40GHz [19], nonetheless suffer from drift of the phase corresponding to a specific control voltage and from lower resolution compared to SLMs.…”

Section: B Multiple 2π Phase Controlmentioning

confidence: 99%

Integrated multi-dithering controller for adaptive optics

Loizos

Liu

Sotiriadis

et al. 2007

Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation

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Effective compensation of phase noise in laser communication calls for fast, real-time, adaptive wavefront control. We present an analog, continuous-time, high-speed VLSI (Very Large Scale Integration) controller implementing multi-dithering perturbative gradient descent optimization of a direct measure of optical performance. The system applies parallel sinusoidal perturbations to the wavefront over a range of frequencies, and performs parallel synchronous detection of the metric signal to derive the gradient components over each frequency band. The system operates over a wide range of frequencies, supporting applications of model-free adaptive optics extending from compensation of slow atmospheric turbulence to compensation of fast random phase fluctuations in the actuators and laser amplifiers. The system has been tested as a phase controller for a multiple laser beam wavefront propagating through a highly turbulent medium. The results indicate a compensation bandwidth exceeding 300 kHz matching the turbulence bandwidth.

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“…A 2-D lock-in amplifier with the MSLM (Microchannnel spatial light modulatior) is developed to detect the 2-D periodic signal. In the MSLM, the input pattern is converted into an electron charge image intensified by a microchannel plate (MCP) [44]. The electron charge image is then projected, though a mesh electrode, on to the surface of an electro-optic crystal to build up an electric field across the crystal.…”

Section: Optical Information Processingmentioning

confidence: 99%

Coherent Photonic Sensing

Hotate

1999

Sensors Update

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Transfer characteristics of the microchannel spatial light modulator

Cited by 29 publications

References 7 publications

Demultiplexing OAM beams via Fourier optical convolutional neural network

Demultiplexing OAM beams via Fourier optical convolutional neural network

Integrated multi-dithering controller for adaptive optics

Coherent Photonic Sensing

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