Acoustooptic Device Applied to Strain Sensing System with Compensated Temperature Characteristics

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.

Section: Introductionmentioning

confidence: 99%

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

Kakio

Shinkai

Kawate

et al. 2009

“…Such a device has been used as an AO tunable filter (AOTF) since wavelength-selective processing with a narrow band pass can be realized by controlling the driving frequency. [1][2][3][4][5][6][7][8][9][10][11][12] On the other hand, the authors have proposed a waveguide-type AO modulator (AOM) driven by an 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 m. [13][14][15][16][17][18][19][20] In contrast to collinear devices, the waveguide-type AOM can perform modulation in a wide wavelength range at the same driving frequency. 14) By applying the features to the visible range, the authors have also realized a waveguide-type AOM, in which laser lights of the three primary colors, red, green, and blue (RGB), can be modulated by the same modulator at the same driving frequency.…”

Section: Introductionmentioning

confidence: 99%

Polarization Control by Leaky Surface Acoustic Wave in Reverse-Proton-Exchanged LiNbO₃ Optical Waveguide

Kakio

Sato

2012

Polarization control of the optical guided wave in a new configuration using a reverse-proton-exchanged (RPE) LiNbO3 straight waveguide and a leaky surface acoustic wave (LSAW) which propagates perpendicular to the straight waveguide was proposed. First, the perturbation of the dielectric tensor was estimated by using coupled mode theory. When a Love-type SAW on a proton-exchanged layer/YX-LiNbO3 was assumed, comparable perturbations to those in conventional Bragg diffraction due to a Rayleigh wave were confirmed. Next, a sample device with an LSAW wavelength Λ of 136 µm was fabricated on YX-LiNbO3 using an RPE channel waveguide. It was found that the incident linearly polarized wave was rotated by -90° in addition to the inherent rotation due to the perturbation of the LSAW without adding the LSAW wavenumber vector to the propagation constant of the incident optical guided mode. The maximum conversion efficiencies for optical wavelengths of 633, 532, and 473 nm were 87, 43, and 40%, respectively. The measured response time of 280 ns was almost equivalent to the time required for the propagation of the LSAW through the interdigital transducer width.

“…In particular, collinear AO coupling devices have been of interest since wavelength-selective processing with a narrow band pass can be realized by controlling the driving frequency. [1][2][3][4][5][6][7][8][9][10] In the collinear AO coupling devices, a relatively slow switching time of ms order is needed because the length of the AO interaction region is of 10 mm order.…”

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

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. #