Abstract
We demonstrate tunable mid-infrared (MIR) Raman soliton generation in an all-solid fluorotellurite fiber pumped by a 1960 nm femtosecond fiber laser. All-solid fluorotellurite fibers are fabricated by using a rod-in-tube method. The core and cladding materials are TeO2-BaF2-Y2O3 (TBY) and AlF3-based glasses. Since the refractive index of AlF3-based glass is much lower than that of TBY glass, the zero-dispersion wavelength of all-solid fluorotellurite fiber can be tuned in a wide range by simply varying the core diameter of the fiber. By using a 0.5 m long all-solid fluorotellurite fiber with a core diameter of ∼ 2.7 μm as the nonlinear medium and a 1960 nm femtosecond fiber laser as the pump source, tunable MIR Raman soliton generation from 1.96 to 2.82 μm is obtained via soliton self-frequency shift by increasing the pump power. For the soliton laser source operating at 2.82 μm, the obtained optical-to-optical conversion efficiency is about 18% and the calculated pulse width is about 93 fs. Our results show that all-solid fluorotellurite fibers are promising nonlinear media for constructing tunable MIR ultrafast laser sources.
Highlights
Raman soliton generation in optical fibers, as one of the most promising approaches for achieving tunable ultrafast laser sources, has been widely investigated.[8,9,10,11]. It is induced by Raman gain in which the blue portion of the soliton spectrum pumps the red portion of the spectrum, causing a continuous red shift in the soliton spectrum, which is called by soliton self-frequency shift (SSFS).[9]
Tunable Raman soliton generation from 1.98 to 2.31 μm was obtained in silica fibers.[12]
Liu et al demonstrated a widely tunable Raman soliton source (1.93–3.95 μm) in a fluoride microstructured fiber pumped by a 1.93 μm fiber laser with a pulse width of 200 fs through numerical simulations.[18]
Summary
Tunable mid-infrared (MIR) ultrafast laser sources have attracted much attention for many applications in spectroscopy, trace gas sensing, biomedical and etc.[1,2,3,4,5,6,7] Raman soliton generation in optical fibers, as one of the most promising approaches for achieving tunable ultrafast laser sources, has been widely investigated.[8,9,10,11] It is induced by Raman gain in which the blue portion of the soliton spectrum pumps the red portion of the spectrum, causing a continuous red shift in the soliton spectrum, which is called by soliton self-frequency shift (SSFS).[9]. Tunable mid-infrared Raman soliton generation from 1.96 to 2.82 μm in an all-solid fluorotellurite fiber
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