| Abstract [eng] |
This work investigates the usage of nonlinear optical effects in optical fibers to overcome some of the physical limitations that short pulse fiber based generators face. The optical wavelength was converted from 1 µm to visible (648 nm) and near-IR ranges (910-940 nm) by using different photonic crystal fibers. This allows to expand the available wavelength range to those, that do not have a developed amplifying medium. It was also demonstrated experimentally that the setup for this type of frequency conversion can be assembled using all-fiber components. The second chapter of the thesis was dedicated to regenerative pulse shaping by using the Mamyshev regenerative chain. The use of the Mamyshev regenerator allows the shaping of the pulses from different sources through a set number of spectral broadening and filtering cycles. It was determined experimentally and numerically that to shape the pulse, 3-5 roundtrips inside the regenerative chain are required. The shaped pulse becomes nearly independant from the parameters of the initial pulse, such as pulse duration, energy, or spectral width. Mamyshev regenerative chain allows to shape the pulses from different sources, such as a short pulse oscillator or a pulsed laser diode, which generate the pulses with durations in the range of a few tens of picoseconds. The shaped pulses have parameters strictly determined by the parameters of the regenerative chain, and parameters such as pulse energy or spectral width can even be a few times higher compared to the initial pulse parameters. |
