Praseodymium-doped glasses were prepared in the Ga-Na-S (GNS) system and their optical properties were studied. A single-mode fiber with an attenuation loss of 1.2 dB/m at a wavelength of 1.31 m was fabricated using an extrusion method, and the amplification characteristics were measured in the bidirectional pumping configuration. We demonstrated a gain coefficient of 0.81 dB/mW at a wavelength of 1.34 m, which is the highest we have ever reported, and achieved a net gain of 32 dB for a pump power of 90 mW. Highly efficient optical amplification at a wavelength of 1.3 m was demonstrated in the praseodymium-doped GNS fiber.
The evaporation of ZnSe and Cu2Se powders was used to deposit a Cu-doped ZnSe film on a glass substrate at room temperature; this was followed by laser beam (λ= 355 nm) annealing. The film consisted of a zinc blende, ZnSe, crystalline single phase with the chemical composition (Zn0.9Cu0.1)Se. Over 70% optical transmittance was obtained in the green–red region. The film had a p-type polarity with a conductivity of 0.45 S cm-1 and a workfunction of 4.7 eV. P–n diodes fabricated with the film on an n-type ZnSe:Cl layer showed rectangular behavior with a small turn-on voltage of ∼1.5 V, which is plausibly explained by development of an impurity band.
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