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.

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. #

A modification of the waveguide shape of the monolithically integrated tandem waveguide-type acoustooptic frequency shifter (AOFS) was investigated analytically and experimentally to improve its diffraction properties. The simulated diffraction properties were improved by decreasing the vertex angle of the tapered waveguide. The analytically obtained maximum doubly diffracted beam power increased from 0.43 in the previous AOFS to 0.55. The diffraction properties of a fabricated tandem AOFS were measured and compared with the analytical results.

A simple simultaneous modulation for laser lights of the three primary colors of red, green, and blue was demonstrated using an acoustooptic modulator driven by a surface acoustic wave at the same driving frequency.