The pulsed HF chemical laser of the HI/SF6 system can be excited to the sixth HF vibrational level, and the spectra of this system coincide with those of the HF chemical laser of the H2/F2 system. The pulsed HF chemical laser of the HI/SF6 system can therefore be used as an oscillator or a preamplifier for the power-amplifier of the H2/F2 system. The power of a pulsed HF chemical laser of the HI/SF6 system is said to be poor in comparison with other mixed systems, but the use of a Blumlein-discharge circuit to initiate the electric discharge proved to be effective. An electrical efficiency of 3.9% for a pulsed HF chemical laser of the HI/SF6 system was obtained, and both the electrical efficiency and the output energy of this laser system were comparable with those of the HI/SF6 system.
A pulsed HF chemical laser of the HI/SF6 system can be used as an oscillator or a preamplifier for the laser power-amplifier system of the H2/F2 system. The HF chemical laser of the HI/SF6 system is predicted to extract more energy than the other mixed systems, but the results of calculations based on a simulation model were not in agreement with experiment. In this paper, our calculation was based on the assumption that the HI molecules dissociated upon the initiation. The pulsed HF chemical laser of the HI/SF6 system is here treated theoretically, utilizing the constant-gain methode by a pulsed chemical laser code. The pulsed HF chemical laser is characterized by the laser output energy, power and pulse width. The calculated results in accordance with the assumption that 1% of SF6 and 25% of HI are dissociated by the electric discharge, are in good agreement with the experimental data for a pulsed HF chemical laser of the HI/SF6 system with the Blumlein-discharge circuit.
Tetsuo MIYA Akio KAWANA Yukio TERUNUMA Toshihito HOSAKA
Ultimate low loss single-mode fibers have been prepared by reducing excess due to structural imperfections as much as possible. Loss mechanisms based on the fabricated fibers have also been analyzed. Transmission loss has been reduced almost down to the intrinsic material loss. Minimum loss was 0.2 dB/km at 1.55 µm. It was made clear that the dispersion can be reduced to zero at this wavelength region by increasing the waveguide dispersion. It has been confirmed that such single-mode fibers are very useful for high capacity and long distance transmission media.
Mitsutaka MORIMOTO Kazukiyo TAKAHASHI Hiroki MUTA
A high speed, 4 K word by one bit static Random Access Memory (RAM) has been developed, using Diffusion Self-Aligned (DSA) MOS technology. High speed and low power operation was achieved by combining the following refined devices and new circuit technology; high gain DSA MOS FETs as drivers, Reverse DSA (RDSA) MOS FETs with low threshold voltage (VTAR
Michitoshi TAMORI Sotokichi SHINTANI Hidetaka YANAGIDAIRA Kazuo HASHIMOTO
This paper describes an effective method for coping with short-line-interruptions in high-speed data transmission, and effectiveness of the technique is shown by the experiments.
Evaporated Ni thin films being formed on a bulk Ni electrode were eroded by a single break are in resistive circuit. A model of the crater formation was proposed from observations of the eroded area by Scanning Electron Microscope.
A CCD with resistive input gate and this design are proposed for improving linearity of the dynamic injection method. Fundamental performances of the device are analyzed theoretically.
Masayuki IZUTSU Masatoshi KATO Tadasi SUETA
The tunable filter which utilize the collinear acoustooptic TE-TM mode conversion is discussed. A novel filter structure is proposed intended for realizing desired filter performances by the adjustment of waveguide parameters. Design examples are presented to confirm the advantage of this structure.