Wide-band acousto-optic deflectors with high efficiency for visible range fringe pattern projector

Dupont, Samuel; Kastelik, Jean‐Claude; Causa, F.

doi:10.1063/1.2793775

Cited by 7 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… 31 . This type of interaction geometries is still most frequently used 104 as it provides a broad yet rippled bandshape (in our device reaching up to 25.6% variations, Suppl. Fig.…”

Section: Methodsmentioning

confidence: 97%

Optogenetic stimulation of complex spatio-temporal activity patterns by acousto-optic light steering probes cerebellar granular layer integrative properties

Hernandez

Pietrajtis

Mathieu

et al. 2018

Sci Rep

View full text Add to dashboard Cite

Optogenetics provides tools to control afferent activity in brain microcircuits. However, this requires optical methods that can evoke asynchronous and coordinated activity within neuronal ensembles in a spatio-temporally precise way. Here we describe a light patterning method, which combines MHz acousto-optic beam steering and adjustable low numerical aperture Gaussian beams, to achieve fast 2D targeting in scattering tissue. Using mossy fiber afferents to the cerebellar cortex as a testbed, we demonstrate single fiber optogenetic stimulation with micron-scale lateral resolution, >100 µm depth-penetration and 0.1 ms spiking precision. Protracted spatio-temporal patterns of light delivered by our illumination system evoked sustained asynchronous mossy fiber activity with excellent repeatability. Combining optical and electrical stimulations, we show that the cerebellar granular layer performs nonlinear integration, whereby sustained mossy fiber activity provides a permissive context for the transmission of salient inputs, enriching combinatorial views on mossy fiber pattern separation.

show abstract

“… 31 . This type of interaction geometries is still most frequently used 104 as it provides a broad yet rippled bandshape (in our device reaching up to 25.6% variations, Suppl. Fig.…”

Section: Methodsmentioning

confidence: 97%

Optogenetic stimulation of complex spatio-temporal activity patterns by acousto-optic light steering probes cerebellar granular layer integrative properties

Hernandez

Pietrajtis

Mathieu

et al. 2018

Sci Rep

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…For the one AOD-based method [4,5], due to the movement of gratings in AOD, the amplitude of incident beam must be synchronously modulated in order to freeze the traveling fringe patterns. To overcome the limitation of one AOD, a dual acousto-optic deflection encoding (D-AODE) method is proposed to generate stable fringe patterns with variable spatial frequency [6,7]. In the above mentioned methods, to obtain highly accurate absolute phase of the surface, a long sequence of fringe patterns arising from multiple phase shifts and spatial frequencies should be captured.…”

mentioning

confidence: 99%

Dynamic 3D imaging based on acousto-optic heterodyne fringe interferometry

Guan

Yin

et al. 2014

Opt. Lett.

View full text Add to dashboard Cite

An acoustic-optics heterodyne fringe interferometry coupled with a three-camera system is developed for dynamic 3D imaging. In this system, first-order beams with a slight frequency difference diffracted from two acousto-optic deflectors (AODs) form a beat intensity fringe pattern. Setting the frequency of the trigger signal for the CCD cameras into four times the beat frequency, four-step phase-shifting fringe patterns can be obtained, and the wrapped phase map (WPM) can be calculated. Under the epipolar constraint among three cameras, the homologous points can be determined unambiguously with the assistant of a WPM; thus the 3D shape can be reconstructed while skipping the phase unwrapping step. Experimental results are presented to validate this approach.

show abstract

Wide-band acousto-optic deflectors with high efficiency for visible range fringe pattern projector

Cited by 7 publications

References 10 publications

Optogenetic stimulation of complex spatio-temporal activity patterns by acousto-optic light steering probes cerebellar granular layer integrative properties

Optogenetic stimulation of complex spatio-temporal activity patterns by acousto-optic light steering probes cerebellar granular layer integrative properties

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

Dynamic 3D imaging based on acousto-optic heterodyne fringe interferometry

Contact Info

Product

Resources

About