The Role Of Impurities In The Optical Losses Of Chalcogenide Glass Fibers

Infrared fibers based on Te–As–Se glass system with low optical losses

“…These impurity levels are obtained by comparing the absorption with the known extinction coefficients in the literature (e(SeH) is 2.3 · 10 À3 cm À1 /ppm at. at 4.7 lm for As 2 Se 3 [15]; e(As-O) is 9 · 10 À4 cm À1 /ppm wt at 9 lm for As 2 Se 3 [16]). There are not bands due to CO 2 , OH and molecular H 2 O.…”

“…The hydrogen and oxygen impurities content in the obtained glasses was determined by IR-spectroscopy using the known values of extinction coefficients [15,16].…”

Calorimetric study of characteristic temperatures and crystallization behavior in Ge–As–Se–Te glass system

“…1) indicates that the prepared glasses contained 0.2 -0.5 ppm wt of oxygen in the form of germanium and arsenic oxides and lesser than 4 ppm at of hydrogen in the form of Se -H groups. These impurity levels are obtained the comparing the absorption with the known extinction coefficients in the literature (1(SeH) is 2.3 £ 10 23 cm 21 /ppm at at 4.7 mm for As 2 Se 3 [18]; 1(As -O) is 9 £ 10 24 cm 21 /ppm wt at 9 mm for As 2 Se 3 [19], 1(Ge -O) is 6 £ 10 23 cm 21 /ppm wt at 7.9 mm for Ge -As -Se-Te glass [20]. There is not band due to CO 2 , OH and molecular H 2 O.…”

Nonlinear Properties of Chalcogenide Glass Fibers

“…For As-Se, two losses are given. The loss of 200 dB/km is typical of "champion losses" achieved at NRL for As-Se fiber while the loss of 0.1 dB/km is theoretical loss for As-Se fiber [14]. For the loss of 200 dB/km, we see that g R /α for an As-Se fiber Raman amplifier operating at 4 µm is about 0.38 compared to 1.1 for a silica fiber Raman amplifier.…”