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Development of dispersion tailored optical fibers for ultrafast 2 µm lasers

Abstract : The goal of this PhD thesis is to pave the way towards the demonstration of parabolic amplification at 2 μm in an all-fiber format. The physical theory on self-similar pulse amplification is first presented. The best all-fiber amplifier at 2 μm would need a special Tm-doped fiber with both high normal dispersion and large effective area. Parabolic amplification is however prohibited in silica based singlemode fiber working at 2 μm due to the large anomalous dispersion of silica. To overcome this limitation, a four-mode fiber in which the LP02 mode exhibits high normal dispersion combined with large effective area at 2 μm was designed and manufactured. A dedicated mode converter has also been designed and manufactured. Using the spatially- and spectrally-resolved imaging technique the purity of excitation of the LP02 mode in the passive fiber was evaluated to 99.9%. An ultrashort pulse (100 fs) source tunable from 1.6 μm to 2 μm was implemented to seed the amplifier. This source allowed to measure the LP02 mode dispersion of the passive fiber at the wavelength of 1.95 μm: D = -106 ps/( in excellent quantitative agreement with the simulations. Numerical modeling of a nonlinear amplifier based on the realized active fiber shows that MW peak power class pulses centered at 1.9 μm can be obtained at the output of the parabolic amplifier.
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Submitted on : Friday, June 2, 2017 - 4:36:08 PM
Last modification on : Thursday, May 17, 2018 - 4:06:37 AM
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  • HAL Id : tel-01532315, version 1



Mathieu Jossent. Development of dispersion tailored optical fibers for ultrafast 2 µm lasers. Optics / Photonic. Université de Limoges, 2017. English. ⟨NNT : 2017LIMO0016⟩. ⟨tel-01532315⟩



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