A stripe laser structure called a planar stripe was developed. The edge blurring of the current path is improved by the fact that the current spreads only in the thin p-AlxGa1-xAs layer with relatively high resistance. The planar stripe laser has a small threshold current resulting from the small current spreading effect and a good thermal contact. It also shows finely controlled transverse modes, compared with a usual contact stripe laser, and relatively high external differential quantum efficiency. The threshold current density is comparable to that of the proton bombarded stripe laser. The transverse mode shows an approximate Hermite-Gaussian distribution.
We have developed a new High Voltage CMOS (HV-CMOS) IC technology by using 5 p-thick SOI. In this technology, trench isolation and 0.5 pn rule CMOS process are also adopted. We have examined seven series HV-CMOS fabrication processes in the different voltage rating (which the maximum voltage rating was 250 V) and optimized their characteristics respectively. The HV-CMOS IC having full-CMOS type level shifter is suited to low power consumption Color Plasma Display Panel (C-PDP) and hgh-speed switching has been confirmed. The chip size of the devleloped PDP scan driver IC could be reduced by 40 % compared with the conventional one.
The polarizer is one of the critical components in a high-power millimeter-wave transmission line. It requires full and highly efficient coverage of any polarization states, high-power tolerance, and low-loss feature. Polarizers with rounded shape at the edge of the periodic groove surface are designed and fabricated by the machining process for a mega-watt long-pulse millimeter-wave transmission line of the electron cyclotron resonance heating system in the large helical device. The groove shape of λ/8- and λ/4-type polarizers for an 82.7 GHz transmission line is optimally designed in an integral method developed in the vector theories of diffraction gratings so that the efficiency to realize any polarization state can be maximized. The dependence of the polarization states on the combination of the two polarizer rotation angles (Φλ/8, Φλ/4) is examined experimentally in a low-power test with the newly developed polarization monitor. The results show that the measured polarization characteristics are in good agreement with the calculated ones.
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