Abstract
Compact fiber-based sources generating optical pulses with a broadband spectrum in the mid-IR range are in demand for basic science and many applications. Laser systems producing tunable Raman solitons in special soft-glass fibers are of great interest. Here, we report experimental microstructured tellurite fibers and demonstrate by numerical simulation their applicability for nonlinear soliton conversion in the mid-infrared (-IR) range via soliton self-frequency shift. The fiber dispersion and nonlinearity are calculated for experimental geometry. It is shown numerically that there are two zero dispersion wavelengths for the core size of 2 μm and less. In such fibers, efficient Raman soliton tuning is attained up to a central wavelength of 4.8 μm using pump pulses at 2.8 μm.
Highlights
Compact fiber-based sources generating optical pulses with a broadband spectrum in the mid-IR range beyond 3 μm are in demand for basic science and many applications, including spectroscopy, biomedicine, sensing, remote diagnostics, and others [1,2]
The SSFS in fluoride fibers was attained in the 2.8–3.6 [9] and 2–4.3 μm ranges [10], and in chalcogenide fibers in the 2.986 to 3.419 μm range [11]
We produced experimentally highly nonlinear tellurite MS three-hole fibers with a very low content of hydroxyl groups which is confirmed by a small value of an absorption coefficient α =
Summary
Compact fiber-based sources generating optical pulses with a broadband spectrum in the mid-IR range beyond 3 μm are in demand for basic science and many applications, including spectroscopy, biomedicine, sensing, remote diagnostics, and others [1,2]. Since silica fibers are not transparent in this range (excluding hollow core optical fibers [3]), special fibers based on soft glasses, such as fluoride, chalcogenide, or tellurite, are used [1,2,4]. Due to nonlinear optical effects, it is possible to obtain supercontinuum generation in optical soft-glass fibers of special design [5,6,7,8]. The SSFS in fluoride fibers was attained in the 2.8–3.6 [9] and 2–4.3 μm ranges [10], and in chalcogenide fibers in the 2.986 to 3.419 μm range [11]. Tellurite fibers are of interest for this purpose, since they have several advantages over fluoride and chalcogenide ones
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