Yasutake Ohishi

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We report emission from a bismuth doped chalcogenide glass which is flattened, has a full width at half maximum (FWHM) of 600 nm, peaks at 1300 nm and covers the entire telecommunications window. At cryogenic temperatures the FWHM reaches 850 nm. The quantum efficiency and lifetime were as high as 32% and 175 mus, respectively. We also report two new(More)
We demonstrate the supercontinuum generation in an As<sub>2</sub>Se<sub>5</sub> microstructured optical fiber experimentally. The SC bandwidth of 4280 nm wider than two octaves covering from 1370 to 5650 nm is obtained in 4.8 cm long fiber.
When the chalcogenide-tellurite hybrid optical fiber is pumped by an optical parametric oscillator with the pump wavelength from 1700 to 3000 nm, widely tunable second-harmonic generation (SHG) from 850 nm to 1502 nm is obtained.
Reaction order in Bi-doped oxide glasses depends on the optical basicity of the glass host. Red and NIR photoluminescence (PL) bands result from Bi(2+) and Bin clusters, respectively. Very similar centers are present in Bi- and Pb-doped oxide and chalcogenide glasses. Bi-implanted and Bi melt-doped chalcogenide glasses display new PL bands, indicating that(More)
Broadband photodetector having detection capability ranging from visible to near infrared can be useful as a common detector for both data and transport applications. The capability of using single detector for all application in optical communication as the receiver, not only makes the total system cost lower, but it also makes easier the system vendors to(More)