Monolithically Integrated Tandem Waveguide-Type Acoustooptic Modulator Driven by Surface Acoustic Waves

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

doi:10.1143/jjap.46.4608

Cited by 15 publications

(18 citation statements)

References 14 publications

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“…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%

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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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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“…[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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“…If the deposition of high-quality KNbO 3 thin films is realized, applications to devices, such as wide-band SAW filters [6][7][8][9] and film bulk acoustic resonators, 10) can be expected by utilizing the large piezoelectric constant of the KNbO 3 thin fims. Furthermore, by using a KNbO 3 thin film as an optical waveguide, a waveguide-type acoustooptic modulator 11) with a low driving power can be expected by utilizing the large photoelastic constant of the KNbO 3 thin film.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Evaluation of Highly (110)-Oriented Potassium Niobate Thin Films Prepared by RF-Magnetron Sputtering

Kakio

Kurosawa

Suzuki

et al. 2008

jjap

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Epitaxial (110)-oriented KNbO3 thin films were deposited on a (100) MgO substrate by RF-magnetron sputtering. To clarify the sputtering conditions necessary for obtaining a highly oriented KNbO3 thin film, the relationships among the degree of orientation, the composition ratio of K/Nb, and the lattice plane spacing were evaluated for KNbO3 thin films deposited using several types of target. In the deposition method using dual targets of KNbO3 and K2CO3, a higher orientation and a larger K/Nb ratio were incompatible. In single-target sputtering with a mixture target of KNbO3:K2CO3, as the substrate temperature decreased, although the K/Nb ratio increased and the (220)-plane spacing approached that of orthorhombic bulk KNbO3, the orientation deteriorated. Using a single K-rich target, K5NbOx, containing no CO2, a highly (110)-oriented KNbO3 thin film with a K/Nb ratio of 0.40 and a (220)-plane spacing near that of orthorhombic bulk KNbO3 was obtained by increasing the RF power applied to the O2-radical source. Moreover, the displacement current in the oriented KNbO3 thin film with a K/Nb ratio of 0.40 was observed when an electric field was applied to the interdigital transducer formed on the thin film. This indicates the existence of spontaneous polarization in the oriented KNbO3 thin film.

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Monolithically Integrated Tandem Waveguide-Type Acoustooptic Modulator Driven by Surface Acoustic Waves

Cited by 15 publications

References 14 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

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

Fabrication and Evaluation of Highly (110)-Oriented Potassium Niobate Thin Films Prepared by RF-Magnetron Sputtering

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