Abstract
We report our recent progress on fabricating dehydrated tellurite glass fibers. Low OH content (1 ppm in weight) has been achieved in a new halogen-containing lead tellurite glass fiber. Low OH-induced attenuation of 10 dB/m has been confirmed in the range of 3–4 µm using three measurement methods. This shows the dehydrated halo-tellurite glass fiber is a promising candidate for nonlinear applications in a 2–5 µm region.
Highlights
The mid-infrared 2–5 μm region is one of the atmospheric transmission windows, where the Earth’s atmosphere is relatively transparent
The total cutback length for TZNX and TLX unclad fibers was 7 cm and 52 cm respectively. Another measurement of the OH induced loss in the fabricated dehydrated tellurite fibers was carried out using a crystal optical parametric oscillators (OPOs) based on 1064 nm nanosecond laser pumped magnesium oxide doped periodically lithium niobate (MgO:PPLN) (Covesion Ltd)
Glass, which was melted in the dry atmosphere with water content of less than 0.2 ppm, the OH-induced loss peaking at 3.4 μm is reduced down to 0.38 cm−1, which is one order of magnitude lower than that in the tellurite glasses were 75TeO2-20ZnO-5Na2O (TZN) glass melted in the open atmosphere [16]
Summary
The mid-infrared (mid-IR) 2–5 μm region is one of the atmospheric transmission windows, where the Earth’s atmosphere is relatively transparent. AlF3 based), and chalcogenide (chalcogen S, Se, Te based) glasses [7,8,9], possess excellent optical transparence in the wavelength range of 0.4–7 μm, 0.3–8 μm and 1–16 μm respectively, and are promising candidates as fiber materials for mid-infrared nonlinear optical applications over the conventional silica glass The latter shows inferior transparence beyond 2 μm, due to (i) the strong fundamental vibration hydroxyl absorption at 2.7 μm, and (ii) high loss (>50 dB/m) starting from 3 μm due to the tail of the multi-phonon absorption of Si-O network. It is seen that the fundamental vibration of the hydroxyl group OH− is the most harmful impurities for blocking the transmission of a tellurite glass in 2–5 μm region, in terms of the wide absorption range (3–4 μm) and the high peak absorption coefficient (10 dB/m/ppm). The fabricated dehydrated halo-tellurite glass fibers show low OH induced attenuation from 3–4 μm, indicating that they are promising candidates for 2–5 μm nonlinear optical applications
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