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4 March 2019 Pulse to pulse characterization of a cascaded intermediate thulium doped supercontinuum source for absorption spectroscopy applications (Conference Presentation)
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Abstract
Concatenating fibers to extend supercontinuum generation beyond the multiphonon absorption edge of silica to access longer wavelengths in the mid infrared region has received much attention due to the various molecular fingerprints that exist in this region. Thulium doped (Tm) fiber has been used as an intermediate fiber to get above the multiphonon absorption edge of silica through absorption (900 and 1600 nm) and emission processes between (1800 – 2100 nm) and (2200 - 2600 nm). The advantages of the Tm-doped fiber is not only limited to generating SC above the multiphonon edge of silica but also reducing the high peak power which easily damages the facet of soft glass fibers whose transmission window extends well into the longer mid infrared region. The mechanisms governing the generation of SC in active fibers is quite different from passive fibers as there is interplay of the nonlinear processes that are commonly observed in passive fibers as well as energy transition contributions by the dopants in the fiber. SC generation and its application are hindered by pulse-to-pulse fluctuations as the generation is initiated by noise seeded processes especially in the long pumped regime (> 1ps). In this work we have experimentally studied the pulse fluctuations in thulium gain fiber whose SC spans 1550 – 2700 nm at three different repetition rates (10 KHz , 100 KHz, 200 KHz). We have illustrated the relative intensity noise across the whole spectrum most importantly within the absorption and emission regions of the Tm-doped fiber.
Conference Presentation
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Kyei Kwarkye, Manoj Kumar Dasa, Rasmus D. Engelsholm, Ivan Bravo Gonzalo, Mikkel Jensen, Deepak Jain, Christian R. Petersen, and Ole Bang "Pulse to pulse characterization of a cascaded intermediate thulium doped supercontinuum source for absorption spectroscopy applications (Conference Presentation)", Proc. SPIE 10903, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV, 109030I (4 March 2019); doi: 10.1117/12.2509558; https://doi.org/10.1117/12.2509558
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