Analysis of Acoustic Near Field Characteristics in Acousto-Optic Modulator

Wu, Ji; Xu, Z. Y.; Li, Kunying; Lv, Guoqiang; Li, Xiaoyan; Chengqiang, Wang

doi:10.1109/lpt.2021.3051648

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…The efficiency of the acousto-optical interaction is mainly limited by the acoustic field in the acousto-optical crystal [8] . The transducer plays a decisive role in the distribution of the acoustic field.…”

Section: Analysis Of Rectangular and Conventional Apodization Electrodementioning

confidence: 99%

“…Wachman et al proposed a sidedithered pseudo-random electrode that can effectively reduce the sidelobes and improve the homogeneity of the sound field [7] . Wu et al theoretically analyzed the acoustic near-field distribution characteristics of rectangular, diamond, and hexagonal shapes [8] . Hexagonal electrodes have the most uniform sound field distribution for good performance.…”

Section: Introductionmentioning

confidence: 99%

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Serrated periodic electrode for high energy efficiency and large bandwidth acousto-optic modulators

et al. 2023

中国光学快报

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In an acousto-optic modulator, the electrode shape plays an important role in performance, since it affects the distribution of the acoustic field. The acousto-optic modulator based on the conventional rectangular electrode has the problems of low energy efficiency and small modulation bandwidth due to an imperfect acoustic field. In this paper, a new serrated periodic electrode has been proposed for using acousto-optic modulator transducers. The proposed electrode has the following advantages. By using serrated periodic electrodes to suppress the sidelobes, the collimation of the acoustic field in the direction perpendicular to the light incidence is improved. This makes the acousto-optic modulator have a stable diffraction efficiency fluctuation and high energy efficiency. In addition, the electrode has a large divergence angle in the direction of light incidence, so a large bandwidth can be obtained. The simulations and experiments demonstrate that the serrated periodic electrode has an increased bandwidth and high energy efficiency.

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Section: Analysis Of Rectangular and Conventional Apodization Electrodementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Serrated periodic electrode for high energy efficiency and large bandwidth acousto-optic modulators

et al. 2023

中国光学快报

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“…Since the output signal changes at the frequency of the sonic radiator, these techniques are not applicable to high-frequency AO devices. Laser beam scanning also enables visualization of acoustic fields [ 14 , 15 , 16 , 17 ]. In [ 14 , 15 , 16 ], the laser beam diameter is smaller than the sound wavelength; therefore, this scheme is applicable only to low-frequency fields.…”

Section: Introductionmentioning

confidence: 99%

“…In [ 14 , 15 , 16 ], the laser beam diameter is smaller than the sound wavelength; therefore, this scheme is applicable only to low-frequency fields. In [ 17 ], the shape of the diffracted laser beam allows evaluation of high frequency ultrasonic wave in solid media.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Acoustic Waves in Acousto-Optical Devices by Ultrasonic Imaging

2022

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The structure of the acoustic field defines the key parameters of acousto-optical (AO) devices. To confirm their compliance with the expected values in the presence of multiple real factors, AO crystalline cells require accurate experimental investigation of the acoustic field after being totally assembled. For this purpose, we propose to detect and quantify all the acoustic waves propagating in AO cells using an impulse acoustic microscopy technique. To validate this approach, we have analyzed both theoretically and experimentally the modes, amplitudes, propagation trajectories, and other features of the ultrasonic waves generated inside an AO modulator made of fused quartz. Good correspondence between theoretical and experimental data confirms the effectiveness of the proposed technique.

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Controllable refractive index in a four-level left-handed medium using pulse shaping

Boutabba¹

2021

J. Opt.

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In this paper we control the negative refractive index of a four-level left-handed medium by applying different waveforms to excite the atomic system. The control field is a few-cycle strong pulse described by a double exponential function, and its modified forms, a Gaussian field, and a tan-hyperbolic pulse. The considered four-level system was fully analyzed in terms of the density matrix formalism under the rotating wave approximation, and the refractive index for various control fields was obtained. Hence, under specific conditions, the tunneling, and the modulation of the negative refractive index are achieved for various shaped waveforms. Such strong-shaped laser pulses open the way to fully control the system.

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Analysis of Acoustic Near Field Characteristics in Acousto-Optic Modulator

Cited by 11 publications

References 17 publications

Serrated periodic electrode for high energy efficiency and large bandwidth acousto-optic modulators

Serrated periodic electrode for high energy efficiency and large bandwidth acousto-optic modulators

Evaluation of Acoustic Waves in Acousto-Optical Devices by Ultrasonic Imaging

Controllable refractive index in a four-level left-handed medium using pulse shaping

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