Two-dimensional multi-channel acousto-optic diffraction

Zhao, Luming; Zhao, Qida; Zhou, Jinchuan; Tian, Shichao; Zeng, Hao

doi:10.1016/j.ultras.2009.10.018

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…Acousto-optic (AO) spatial light modulators (SLMs) are widely used in advanced microscopy, Fourier optics, microwave spectral analysis, ultrafast laser pulse shaping, and digital holography. [1][2][3][4][5][6][7][8][9] A dynamic hologram can be created in the acousto-optic crystal by an arbitrary wave generator (AWG) to create complex field distributions in the far field.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional acousto-optic SLM

Chizhikov

Molchanov

Naumenko

et al. 2022

Holography, Diffractive Optics, and Applications XII

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A prototype of two-coordinate spatial light modulator (SLM) based on acousto-optic diffraction in KY(WO4)2 monoclinic crystal is proposed. The SLM design is based on a special configuration of isotropic Bragg diffraction in monoclinic crystals, which used autocollimation of the acoustic beams and operation with unpolarized light. This enables a unique design of a two-coordinate Bragg cell, which can be used as a monolithic X-Y deflector or as an SLM. Experimental results and limitations of the prototype performance are discussed in the report. Overall efficiency over 50% at 4 W of driving RF power has been demonstrated for the laser wavelength of 532 nm. Optical modulation rise/fall time is ~220 ns/mm for each coordinate.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional acousto-optic SLM

Chizhikov

Molchanov

Naumenko

et al. 2022

Holography, Diffractive Optics, and Applications XII

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“…The scanning or deflection of light with high performance and broad frequency bandwidth is applied in a number of applications, including light modulators, optical beam deflectors, optical signal processors, optical tunable filters [1,2], radiofrequency (RF) spectrum analyzers [3], wavelength division multiplexing optical communication [4][5][6], optical tweezers for molecule trapping [7][8][9], optical image scanners [10][11][12], optical fringe pattern projectors [13][14][15], and optical frequency shifters [16,17]. Acousto-optic deflectors (AODs) involve interactions between lasers and acoustic waves, and the deflectors generally operate in three different modes: random access, continuous mode, and multi-frequency modes [18].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional refractive index modulation by phased array transducers in acousto-optic deflectors

et al. 2017

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Acousto-optic deflectors are photonic devices that are used for scanning high-power laser beams in advanced microprocessing applications such as marking and direct writing. The operation of conventional deflectors mostly relies on one-dimensional sinusoidal variation of the refractive index in an acousto-optic medium. Sometimes static phased array transducers, such as step configuration or planar configuration transducer architecture, are used to tilt the index modulation planes for achieving higher performance and higher resolution than a single transducer AO device. However, the index can be modulated in two dimensions, and the modulation plane can be tilted arbitrarily by creating dynamic phase gratings in the medium using phased array transducers. This type of dynamic two-dimensional acousto-optic deflector can provide better performance using, for example, a large deflection angle and high diffraction efficiency. This paper utilizes an ultrasonic beam steering approach to study the two-dimensional strain-induced index modulation due to the photoelastic effect. The modulation is numerically simulated, and the effects of various parameters, such as the operating radiofrequency of the transducers, the ultrasonic beam steering angle, and different combinations of pressure on each element of the transducer array, are demonstrated.

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“…Moreover, WVLC can provide communication links in specific areas in which RF communication is prohibited, such as in hospitals or in aircraft; generating a secure link channel since the light beam is visible and directional [3]. He-Ne lasers [4] and pigtailed laser diodes [5] have been used as light sources for acousto-optic modulators (AOMs) because these devices generate coherent light beams. However, these laser devices are expensive and driver circuits for these devices are complicated.…”

Section: Introductionmentioning

confidence: 99%

An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings

Colin

García-Juárez

Zaldívar-Huerta

et al. 2016

J. Opt.

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In this paper we propose a photonic architecture as an alternative tool to distribute point to multipoint analog and digital information over a hybrid wireless visible optical communication system. The experimental set-up is composed of a red laser pointer, an acousto-optic modulator, a sinusoidal grating and a photo-detector array. By using a simple and variable interferometric system, diffraction gratings with different spatial frequencies are generated and recorded on a photoemulsion which is composed of vanilla with dichromate gelatin. Analog video and digital information are first transmitted and recovered over a wireless communication system using a microwave carrier at 4.52 GHz which is generated by distributed feedback lasers operating in the low laser threshold current region. Separately, the recovered video information and digital data are combined with a radio frequency signal of 80 MHz, obtaining a subcarrier of information that is imposed on the optical carrier of the pointer laser using an acousto-optic modulator which is operated with an angle of incident light that satisfies the Bragg condition. The modulated optical carrier is sent to a sinusoidal grating, the diffraction pattern is photo-detected using an array of PIN photo-detectors. The use of sinusoidal gratings with acousto-optic modulators allows that number of channels to be increased when both components are placed in cascade.

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Two-dimensional multi-channel acousto-optic diffraction

Cited by 10 publications

References 22 publications

Two-dimensional acousto-optic SLM

Two-dimensional acousto-optic SLM

Two-dimensional refractive index modulation by phased array transducers in acousto-optic deflectors

An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings

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