Abstract
Optical properties of Ge-Se-Te chalcogenide glasses for CO2 laser light transmission are investigated. It is found that the Te content of more than about 60 mol % is essential in reducing fundamental absorption caused by lattice vibration at 10.6 μm (CO2 laser light wavelength). It is also found that the Se content above 5 mol % is required to eliminate wavelength-independent scattering loss due to glass imperfections. As a result, the transmission loss of the optical fiber drawn from the Ge22Se20Te58 glass block is reduced to 1.5 dB/m at 10.6 μm. Further loss reduction is expected by suppressing the creation of the Te crystallites during the drawing process.
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