High efficiency guided-wave magnetooptic Bragg cell modulator using nonuniform bias magnetic field
作者:
C. S. Tsai,
Y. S. Lin,
J. Su,
S. R. Calciu,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 25
页码: 3715-3717
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.120491
出版商: AIP
数据来源: AIP
摘要:
A technique for large enhancement of the diffraction efficiency of a guided-wave magnetooptic (MO) Bragg cell modulator using a nonuniform bias magnetic field in bismuth-doped yttrium iron garnet-gadolinium gallium garnet waveguide is reported. Since the velocity of propagation of the magnetostatic forward volume wave (MSFVW) varies with the bias magnetic field, a bias magnetic field of proper spatial distribution will modify its wave front and, thus, create a lensing effect upon the MSFVW. This lensing effect in turn reduces the angular beam spread of the MSFVW, and results in a higher MO Bragg diffraction efficiency. The experimental data obtained for the cases with uniform and nonuniform bias magnetic fields at the carrier center frequency range of 2.0–3.5 GHz have demonstrated a diffraction efficiency enhancement by two to six times. A diffraction efficiency as high as 70&percent; has also been accomplished. Furthermore, the measured frequency responses indicate that the nonuniform bias magnetic field has had only a mild effect on the bandwidth of the MO Bragg cell modulator. ©1997 American Institute of Physics.
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