Improvement of Diffraction Properties in Waveguide-Type Acoustooptic Modulator Driven by Surface Acoustic Wave

Kakio, Shoji; Uotani, Shinji; Nakagawa, Yasuhiko; Hara, T.; Ito, Hiromasa; Kobayashi, T.; Watanabe, Masayuki

doi:10.1143/jjap.46.669

Cited by 16 publications

(16 citation statements)

References 8 publications

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“…The tendency was observed in the design of the waveguide-type AOM for ¼ 1:55 mm. 14) Furthermore, the diffraction properties were optimum at approximately L g ¼ 1:0 mm.…”

Section: Bpm Analysismentioning

confidence: 97%

“…On the other hand, the authors have proposed a waveguide-type AO modulator (AOM) driven by SAW using coplanar AO coupling, that is Bragg diffraction, in a tapered crossed-channel proton-exchanged (PE) optical waveguide on a 128 -rotated Y-cut LiNbO 3 substrate for an optical wavelength of 1.55 mm. [10][11][12][13][14][15][16] In contrast to collinear devices, the waveguide-type AOM can perform modulation in a wide wavelength range at the same driving frequency. 11) This leads to a difficulty in wavelength-selective processing.…”

Section: Introductionmentioning

confidence: 99%

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Surface-Acoustic-Wave-Driven Acoustooptic Modulator with Wide Wavelength Range for Visible Laser Light

Kakio

Shinkai

Kawate

et al. 2009

Jpn. J. Appl. Phys.

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The electronpar~,,agneticresonance(E~n) ofan Mn2+ (S = 5/2)impurityin thefvroelasticandpars,el~ticphaseof BiVOa aystab withaein&domain. grown by the Czodrralrki method, has been investigated using an X-band spectrometer. The rotatimpattansof theresouanceficldsmeasdon the crystallographic.094 f 0.002, B:/h = 0.0, A=/IL = 0.27f 0.02, A,/h = 0.25 f 0.02, and A,/h=093fO.O2GHzatroomtnnnpraatre((< T, = 5 2 8 K ) ; m d g = 1.994f0.001, D/h = 0.000 f 0.004, E / h = 0.000 f 0.004, F / h = 0.00 & 0.01, A / h = 0.25 f 0.01 GHz at T = 535 K (> TC). The principal 2. y, and z axes of the D-tensor are foundto be along the crystallographic 6, c + 45' and Z + 45' axes, respectively. This fiz+ a n t r e has the correct principal axes system of the D-tensor compsred with the previous Miq centre. The D-value deueases as the temperature increases in the range 107-535 K. It is proposed that the Mn*+ ion substitutes for Bi3+ without nearby charge compemation.

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“…The tendency was observed in the design of the waveguide-type AOM for ¼ 1:55 mm. 14) Furthermore, the diffraction properties were optimum at approximately L g ¼ 1:0 mm.…”

Section: Bpm Analysismentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Surface-Acoustic-Wave-Driven Acoustooptic Modulator with Wide Wavelength Range for Visible Laser Light

Kakio

Shinkai

Kawate

et al. 2009

Jpn. J. Appl. Phys.

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“…Although various types of holographic display technologies are currently available, these displays are not suitable for use in portable devices because of their large volume and power consumption, high cost, and system complexity. For real-time 3-dimensional (3D) holographic video in free space, a spatial light modulator (SLM) is necessary to modulate the intensity, direction, phase, and focal length of the light beam [1][2][3][4]. Most of the current technology in SLMs employs optical addressing technology that either moves the light source directly to form a 3D image or uses a secondary light source with no mechanical movements [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effective Light Beam Modulation by Chirp IDT on a Suspended LiNbO3 Membrane for 3D Holographic Displays

Lee

2020

Sensors

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An acousto-optic (AO) holographic display unit based on a suspended waveguide membrane was developed. The AO unit consists of a wide bandwidth chirp interdigital transducer (IDT) on a 20 µm thick suspended crystalline 128° YX LiNbO3 membrane, a light blocker with a 20 µm hole near the entrance, and an active lens near the exit. The 20 µm thickness of the floating membrane significantly enhanced surface acoustic wave (SAW) confinement. The light blocker was installed in front of the AO unit to enhance the coupling efficiency of the incident light to the waveguide membrane and to remove perturbations to the photodetector during measurement at the exit region. The active lens was vertically attached to the waveguide sidewall to collect the diffracted beam without loss and to modulate the focal length in free space through the applied voltage. As SAWs were radiated from the IDT, a Bragg grating with periodic refractive indexes was formed along the waveguide membrane. The grating diffracted incident light. The deflection angle and phase, and the intensity of the light beam were controlled by the SAW frequency and input power, respectively. The maximum diffraction efficiency achieved was approximately 90% for a 400 MHz SAW. COMSOL simulation and coupling of mode modeling were performed to optimize design parameters and predict device performance.

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“…[11][12][13][14][15][16][17] In contrast to collinear devices, the waveguide-type AOM can perform modulation in a wide wavelength range at the same driving frequency. 12) This leads to a difficulty in wavelength-selective processing.…”

Section: Introductionmentioning

confidence: 99%

Simple Simultaneous Modulation for Red, Green, and Blue Laser Lights Using Surface-Acoustic-Wave-Driven Acoustooptic Modulator

Kakio¹,

Shinkai²,

Nakagawa³

2010

Jpn. J. Appl. Phys.

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An acoustooptic modulator (AOM) driven by a surface acoustic wave (SAW), in which laser light of the three primary colors, red, green, and blue (RGB), can be modulated by the same modulator at the same driving frequency, was investigated. To suppress the light power leaked to the outside of the waveguide, a waveguide-type AOM with a 3.5-mm-deep waveguide was fabricated. The RGB laser lights were modulated with the diffraction efficiencies of 73 -85% and a driving SAW power of less than 0.2 W at the same driving frequency of 245.5 MHz. By combining the AOM module, laser sources, WDM couplers, and fiber delay lines, a simple simultaneous modulation for RGB laser lights was proposed and constructed. On the basis of the designed properties, the switching time of the output signal from the constructed system equipped with the AOM with the three-finger-pair interdigital transducer (IDT) was demonstrated to be 28 ns. #

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Improvement of Diffraction Properties in Waveguide-Type Acoustooptic Modulator Driven by Surface Acoustic Wave

Cited by 16 publications

References 8 publications

Surface-Acoustic-Wave-Driven Acoustooptic Modulator with Wide Wavelength Range for Visible Laser Light

Surface-Acoustic-Wave-Driven Acoustooptic Modulator with Wide Wavelength Range for Visible Laser Light

Effective Light Beam Modulation by Chirp IDT on a Suspended LiNbO3 Membrane for 3D Holographic Displays

Simple Simultaneous Modulation for Red, Green, and Blue Laser Lights Using Surface-Acoustic-Wave-Driven Acoustooptic Modulator

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