Acousto-optic low-frequency shifter

Gazalet, M.; Ravez, M.; Haine, F.; Bruneel, C.; Bridoux, E.

doi:10.1364/ao.33.001293

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…For the proposed geometry, the angles between the optical axis and the different light beams are assumed to be higher than a few degrees. As a consequence, the crystal is considered as uniquely uniaxial since optical activity around the optical axis can be neglected [17]. For numerical calculations and experimental validations, the free wavelength λ 0 514 nm will be considered.…”

Section: A Main Characteristics Of Tellurium Dioxidementioning

confidence: 99%

“…Acousto-optic frequency shifters (AOFS) are key components often used in a number of recent applications, including optical heterodyning and interferometry as, for example, laser Doppler velocimetry and vibrometry [1][2][3], fringe projection [4,5], optical coherence tomography [6][7][8][9], holography [10,11], spectroscopy [12,13], optical communication [14], and four-wave mixing microscopy [15]. Various optical architectures have been proposed in the literature in order to obtain low-frequency or high-frequency shifts [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Acousto-optic wide band optical low-frequency shifter

et al. 2013

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A wide bandwidth tunable optical low-frequency shifter is presented in this work. It is based on two acousto-optic devices operating in tandem. The relevant parameters of the specific configurations of acousto-optic interactions in paratellurite material are detailed. Results from numerical computations leading to the practical design parameters are given. The low-frequency shifter has been experimentally tested at a visible wavelength λ₀=514 nm and a high efficiency (>60%) has been measured. The tuning capability of the optical shifter covers a bandwidth Δf=26 MHz.

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Section: A Main Characteristics Of Tellurium Dioxidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acousto-optic wide band optical low-frequency shifter

et al. 2013

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“…Additionally, AODs allow higher deflection velocities, better accuracy in the scan angle and lower response time than the mechanical deflectors due to massless photons [1]. Various applications of AODs include optical communication [4][5][6], optical tweezers for molecule trapping [7], optical image scanners [8,9], and optical frequency shifters [10,11]. Two cascaded Bragg cells are generally used for two-dimensional scanning of lasers in imaging applications.…”

Section: Introductionmentioning

confidence: 99%

Gaussian beam diffraction by two-dimensional refractive index modulation for high diffraction efficiency and large deflection angle

et al. 2017

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The propagation of Gaussian beams is analyzed for an acousto-optic deflector by varying the refractive index in two-dimensions with a row of phased array piezoelectric transducers. Inhomogeneous domains of phase grating are produced by operating the transducers at different phase shifts, resulting in two-dimensional index modulation of periodic and sinc function profiles. Also different phase shifts provide a mechanism to steer the grating lobe in various directions and, therefore, the incident angle of the laser beam on the grating plane is automatically modified without moving the beam. Additionally, the acoustic frequency can be varied to achieve the Bragg condition for the new incident angle of the laser beam so that the diffraction efficiency of the deflector is maximized. The Gaussian beam is expressed in terms of planes and the second order coupled mode theory is implemented to analyze the diffraction of the beam. The diffraction efficiency is found to be nearly unity for optimal operating parameters of the acousto-optic device.

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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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Acousto-optic low-frequency shifter

Cited by 13 publications

References 23 publications

Acousto-optic wide band optical low-frequency shifter

Acousto-optic wide band optical low-frequency shifter

Gaussian beam diffraction by two-dimensional refractive index modulation for high diffraction efficiency and large deflection angle

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

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