An approach of multiple-frequency millimeter-wave (mm-wave) signal generation is proposed for radio-over-fiber (RoF) system with multiple-frequency basestations (MFBSs). Two groups of orthogonally polarized signals are injected into a semiconductor optica
We report the fabrication of submicrometer pits array (SP-array) on 6H-SiC surface by the interference of two femtosecond laser beams. Formation mechanisms and optical absorption of SP-array are studied. The relative reflectivity and transmissivity of whi
It is difficult to realize real-time measurement of exterior attitude by the traditional systems based on the area image sensor which have conflict between speed and accuracy. The subsystem for three-dimensional (3D) coordinate reconstruction of point tar