The 6 reference contexts in paper D. Klimentov S., N. Tolstik A., V. Dvoyrin V., I. Sorokina T., Д. Климентов С., Н. Толстик А., В. Двойрин В., И. Сорокина Т. (2015) “МЕТОДИКА ИЗМЕРЕНИЙ ДИСПЕРСИИ ГРУППОВОЙ СКОРОСТИ В ШИРОКОМ СПЕКТРАЛЬНОМ ДИАПАЗОНЕ В ИНФРАКРАСНОЙ ОБЛАСТИ СПЕКТРА // BROADBAND METHOD FOR GROUP VELOCITY DISPERSION MEASUREMENTS IN THE MID-INFRARED” / spz:neicon:pimi:y:2011:i:2:p:116-120

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    2-μm lasers are preferable as pump sources for optical parametric oscillators (OPOs) and optical parametric amplifiers (OPAs) in the midinfrared region than 1-μm lasers since they provide higher quantum efficiency. Based on these considerations, solid-state and fiber lasers operating around the 2-μm waveband have been intensively investigated recently
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    [1–4]
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    . However, only few demonstrations of modelocked subpicosecond fiber lasers operating at 2 μm have been reported to date, mainly due to lack of proper pulse initiative components and large anomalous dispersion of conventional optical fibers at 2 μm [5–8].
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    However, only few demonstrations of modelocked subpicosecond fiber lasers operating at 2 μm have been reported to date, mainly due to lack of proper pulse initiative components and large anomalous dispersion of conventional optical fibers at 2 μm
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    [5–8]
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    . Precise cavity design or dispersion management of active as well as passive optical fibers became essential for generation and delivery of ultrashort pulses in this spectral range.
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    Measuring of dispersion in fibers is also important since it became possible to produce special microstructured optical fibers (photonic crystal fibers - PCF) with controllable group-velocity dispersion
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    . Such fibers with precisely positioned zerodispersion wavelength are used as sources of superbroadband emission (supercontinuum) [11, 12], which are important for spectroscopic applications, detection of gases etc.
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    Measuring of dispersion in fibers is also important since it became possible to produce special microstructured optical fibers (photonic crystal fibers - PCF) with controllable group-velocity dispersion [9, 10]. Such fibers with precisely positioned zerodispersion wavelength are used as sources of superbroadband emission (supercontinuum)
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    , which are important for spectroscopic applications, detection of gases etc. Several methods were developed for measuring of dispersion parameter of optical fibers since 1980’s [13–17]. Most of the techniques are interferometric and require the source of low-coherent emission to be used in the setup.
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    Such fibers with precisely positioned zerodispersion wavelength are used as sources of superbroadband emission (supercontinuum) [11, 12], which are important for spectroscopic applications, detection of gases etc. Several methods were developed for measuring of dispersion parameter of optical fibers since 1980’s
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    [13–17]
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    . Most of the techniques are interferometric and require the source of low-coherent emission to be used in the setup. The most challenging task on the way of adopting these methods for mid-IR spectral range is the lack of the broadband sources of low-coherent light in this spectral region.
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    The shape and amplitude of interference signal was additionally controlled by the oscilloscope. Based on these data, the dependence of the path difference ∆l on the wavelength λ was plotted. Dispersion parameter D(λ) and path difference ∆l(λ) are related through
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    [18]
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    : , л 1[(л)] (л) d dl Lc D (1) where L is the length of the fiber under test; c is the speed of light. Experimental verification In order to verify the measurement technique described above the dispersion parameter of standard telecommunication fiber SMF-28 was measured with the setup shown in figure 1.
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